CA2085446C - Organic electroluminescent multicolor image display device - Google Patents

Organic electroluminescent multicolor image display device Download PDF

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CA2085446C
CA2085446C CA002085446A CA2085446A CA2085446C CA 2085446 C CA2085446 C CA 2085446C CA 002085446 A CA002085446 A CA 002085446A CA 2085446 A CA2085446 A CA 2085446A CA 2085446 C CA2085446 C CA 2085446C
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pixel
electrode means
sub
pixels
medium
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CA2085446A1 (en
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Ching Wan Tang
David James Williams
Jack Che-Man Chang
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Eastman Kodak Co
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Eastman Kodak Co
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    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10OLED displays
    • H10K59/17Passive-matrix OLED displays
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/06Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00Electroluminescent light sources
    • H05B33/12Light sources with substantially two-dimensional radiating surfaces
    • H05B33/14Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00Electroluminescent light sources
    • H05B33/12Light sources with substantially two-dimensional radiating surfaces
    • H05B33/26Light sources with substantially two-dimensional radiating surfaces characterised by the composition or arrangement of the conductive material used as an electrode
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00Organic light-emitting devices
    • H10K50/80Constructional details
    • H10K50/805Electrodes
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/30Devices specially adapted for multicolour light emission
    • H10K59/38Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80Constructional details
    • H10K59/805Electrodes
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10OLED displays
    • H10K59/17Passive-matrix OLED displays
    • H10K59/173Passive-matrix OLED displays comprising banks or shadow masks
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00Stock material or miscellaneous articles
    • Y10S428/917Electroluminescent

Abstract

An organic electroluminescent multicolor image display device is disclosed containing an image display array made up of a plurality of light emitting pixels arranged in intersecting files (rows and columns). Each pixel contains a light transmissive first electrode, an electroluminescent medium overlying the first electrode, and an overlying second electrode.
The electrodes connect the pixels in an X-Y addressing pattern. The organic electroluminescent medium emits in the blue region of the spectrum. Each pixel is divided into at least two sub-pixels. The electrodes of one set of parallel files is divided into at least two laterally spaced elements each of which joins and forms a part of one sub-pixel of each pixel in the same file. A fluorescent medium capable of absorbing light emitted by the electroluminescent medium and emitting at a longer wavelength is positioned to receive emitted light from the first electrode means. The fluorescent medium is confined to only one of the sub-pixels of each pixel.

Description

w..

ORGANIC ELECTROLUMINESCENT MULTICOLOR
IMAGE DISPLAY DEVICE
gield Q,f, ~ Invention The invention is directed to an organic electroluminescent image display device and to a process for its fabrication.
prior B~
Scozzafava EP 349,265 (a patent application published by the European Patent Office on January 3, 1990) discloses an organic electroluminescent image display device and a process for its fabrication.
Scozzafava discloses a glass support bearing a series of laterally spaced, parallel indium tin oxide anode strips. An organic electroluminescent medium overlies the anode strips. Laterally spaced, parallel cathode strips, orthogonally oriented relative to the anode strips, are formed over the organic electroluminescent medium by depositing cathode forming metal as a continuous layer followed by patterning.
Patterning of the cathode layer into cathode strips is achieved by spin coating a solution of monomeric negative-working photoresist in 2-ethoxyethanol solvent. The photoresist is imagewise exposed to W
radiation to produce a pattern of crosslinking, and uncrosslinked photoresist is removed by dipping the array in 2-ethoxyethanol for a few seconds. This removes unexposed photoresist and uncovers areas of the cathode layer. The uncovered areas of the cathode layer are removed by dipping the array in an acid etch bath consisting of 1000:1 water: sulfuric acid solution.
After producing the cathode strips by this procedure, the array is rinsed in water and spun to remove excess water.
R. Mach and G. O. Mueller, 'Physics and Technology of Thin Film Electroluminescent Displays", 20$~4~~
Semicond. Sci. Technol.6 (1991) 305-323, reviews the physics of thin film electroluminescent devices (TFELD) constructed using inorganic luminescent materials. In Fig. 20 a full color pixel construction is shown in which patterned blue, green and red emitting inorganic layers form sub-pixels. An alternative full color pixel construction employs a white inorganic emitter in combination with a color filter array containing pixels patterned into blue, green and red transmitting sub-pixels.
,$~~y ~ ,~,~ Invention In one aspect this invention is directed to a light emitting device comprised of an image display array consisting of a plurality of light emitting pixels arranged in two intersecting sets of parallel files, the pixels in a first set of parallel files forming columns and the pixels in a second set of parallel files forming rows. Each pixel in the same file of one set of parallel files contains and is joined by a common light transmissive first electrode means. The first electrode means in adjacent files of the one set is laterally spaced. An organic electro-luminescent medium overlies the first electrode means.
Each pixel in the same file of the remaining set of parallel files contains and is joined by a common second electrode means located on the organic electroluminescent medium, and the second electrode means in adjacent files of the remaining set is laterally spaced on the organic electroluminescent medium.
The invention is characterized in that the light emitting device is capable of multicolor image display. The organic electroluminescent medium emits in the blue region of the spectrum and has a peak emission at a wavelength of less than 480 nm. Each ~Q~~ ~~~~
pixel is divided into at least two sub-pixels. In each file of pixels of a selected set one of said first and second electrode means is divided into at least two laterally spaced elements, each of the electrode elements joining and forming a part of one sub-pixel of each pixel in the same file, and a fluorescent medium capable of absorbing light emitted by the organic electro-luminescent medium and emitting at a longer wavelength is positioned to receive emitted light transmitted from the organic electroluminescent medium through the first electrode means, the fluorescent medium forming a part of only one of the sub-pixels of each pixel.
The multicolor organic electroluminescent image display devices of the invention can exhibit operating characteristics comparable to those of otherwise similar organic electroluminescent devices lacking an image display capability. The devices of the invention require no post deposition patterning either of the organic electroluminescent medium or overlying electrodes to produce a multicolor imaging capability and thereby avoid the degradation of efficiency and stability resulting from post deposition patterning procedures.
The multicolor organic electroluminescent image display devices of the invention are also more efficient than devices that emit white light and depend on a patterned color filter array for a multicolor imaging capability. Assuming an ideal system in which white light is emitted that is uniform in intensity throughout the visible spectrum and color filter sub-pixels are employed each of which transmit all light in one third of the spectrum corresponding to one primary hue and absorb all light received in the remainder of the visible spectrum (i.e., an ideal color filter array), it is apparent that two thirds of the light 2~85~46 emitted is internally absorbed and emission efficiency is necessarily limited to only one third that possible with the color filter array absent. In other words, superimposing a multicolor image display capability on a white emitter by the use of a color filter array reduces emission efficiency by two thirds in an ideal system. In actual implementation emission of uniform intensity throughout the visible spectrum as well as ideal absorption and transmission by the filter elements cannot be achieved, and this further reduces system efficiency.
The present invention offers the advantage of requiring no pixel or sub-pixel patterning of the organic electroluminescent medium. Further, it is not necessary to obtain emission from the organic electroluminescent medium over the entire visible spectrum. In addition, no filter element is required that selectively transmits only a portion of light received.
Brief Description ~, ~ Drawings Figure 1 is a plan view with portions broken away of a first embodiment of the invention.
Figures 2 and 3 are sectional views taken along section lines 2-2 and 3-3, respectively, in Figure 1.
Figure 4 is a plan view with portions broken away of a second embodiment of the invention.
Figures 5 and 6 are sectional views taken along section lines 5-5 and 6-6, respectively, in Figure 2; and Figure 7 is a sectional detail of the organic electroluminescent medium and the underlying and overlying electrodes.
Since device feature dimensions such as layer thicknesses are frequently in sub-micrometer ranges, ~~8~~4~
the drawings are scaled for ease of visualization rather than dimensional accuracy.
Descri t~ ~ Preferred Embodiments The acronym EL is in some instances employed for the term "electroluminescent". The term "pixel" is employed in its art recognized usage to designate an area of an image display array that can be stimulated to luminesce independently of other areas. The term "multicolor" is employed to describe image display arrays that are capable of emitting light of a different hue in different areas (sub-pixels) of the same pixel. The term "full color" is employed to describe multicolor image display arrays that are capable of luminescing in the red, green and blue regions of the visible spectrum in different areas (sub-pixels) of a single pixel. The term "file" is employed to designate a row or column. The term "hue"
refers to the intensity profile of light emission within the visible spectrum, with different hues exhibiting visually discernable differences in color.
Referring to Figure 1, a portion of an organic EL device 100 is shown capable of producing a multicolor image. The upper surface of a light transmissive, preferably transparent, electrically insulative planarizing layer 101 is shown bearing a series of light transmissive, preferably transparent, first electrodes R1, R2, R3, R4 and R5. The first electrodes are laterally spaced on the support surface for electrical isolation in parallel rows. In contact with and overlying all but the left most extremities of the first electrodes is an organic EL medium EL.
Overlying the organic EL medium is a series of second electrodes C1, C2, C3, C4 and C5 arranged in parallel columns that are laterally spaced one from the other.
The second electrodes extend laterally beyond the lower 2~~~44~
(as shown in Figure 1) edge of the organic EL medium onto the lower portion of the planarizing layer. In each column the electrode is divided into three parallel laterally spaced elements a, b and c. While in practice the device can (and in almost every instance will) have a much larger areal extent than shown, the portion of the device shown is sufficient to demonstrate its essential structure.
A grid of intersecting dashed lines are shown in Figure 1 marking the boundaries of a series of pixels P. The pixels are arranged in an array of two intersecting sets of files. One set of files extends horizontally as shown in Figure 1 and forms rows while the second set of files extends vertically as shown in Figure 1 and forms columns. The lower row of pixels in Figure 1 each overlie the first electrode R1, and each successive row of pixels overlies one of the successive first electrodes R2, R3, R4 and R5.
Proceeding from left to right in Figure 1, a first column of the pixels share the common overlying second electrode C1 and successive columns of pixels similarly share successive second electrodes. A column of pixels C6 is shown in an area where overlying second electrodes have been broken away for ease of viewing.
In column C6 the pixels are shown to be further divided into sub-pixels Gp, Rp and Bp. In fact, each column of pixels is similarly divided, although, for ease of viewing, this detail is not indicated in each pixel.
The sub-pixels Gp in each column include the overlying a element of each second electrode, the sub-pixels Rp in each column include the overlying b element of each second electrode, and the sub-pixels Bp in each column include the overlying c element of each second electrode. The sub-pixels Gp, Rp and Bp differ in that they emit green, red and blue light, respectively.

The structure of the device that creates the sub-pixels, the structure that divides the second electrodes into separate elements, and the manner in which this structure is fabricated can be appreciated by reference to Figures 2 and 3. The construction of the device 100 begins with a light transmissive, preferably transparent support 105. Polymer and, particularly, glass supports are generally preferred.
On the upper surface of the support is formed a patterned fluorescent medium G that emits in the green and a patterned fluorescent medium R that emits in the red. Each of the fluorescent media G and R are patterned to lie in the areas of the Gp and Rp sub-pixels, respectively. That is, the fluorescent media G
and R are each confined to one sub-pixel column within each column of pixels P. Fortunately, both the fluorescent media and support can be selected from among a variety of materials that are capable of withstanding conventional patterning techniques, such as photolithography, without degradation of their properties.
Together the sub-pixel columns formed by the green and red fluorescent media account for approxi-mately two thirds of the area of each column of pixels.
To provide a smooth surface for deposition of the next layers of the device it is preferred, although not required, to fill in the columns corresponding to sub-pixels Hp separating adjacent columns of green and red fluorescent media. It is possible by conventional patterning techniques to place a convenient transparent material in these columns to the exclusion of all other areas on the support, but the more common approach and the preferred approach is simply to spin cast the planarizing layer 101 as shown over all the upper surfaces of the green and red fluorescent media and the support, since no patterning is required. This either ._ 2~~~~4~
_8_ entirely eliminates (as shown) or minimizes disparities in surface height encountered in subsequent coating steps. Any of a variety of light transmissive, preferably transparent electrically insulative conventional planarizing materials can be employed.
Preferred planarizing materials are organic monomers or polymers that can be polymerized and/or crosslinked after deposition to create a rigid planar surface. A
rigid planarizing layer can also be produced by sol-gel glass forming techniques.
Instead of spin casting a planarizing layer it is alternatively possible simply to place a planar rigid element that is light transmissive, preferably transparent and electrically insulative on the surface of the fluorescent media. Instead of depositing the fluorescent media on the upper surface of the support it is also alternatively possible to deposit the fluorescent media on the lower surface of the rigid element serving the function of the planarizing layer.
The use of a spin cast planarizing layer rather than an interposed rigid element is preferred, since this allows the upper surfaces of the fluorescent media to be nearer the planar surface being created. When the planarizing material is confined by patterning to the areas of sub-pixels HD, the upper surfaces of the fluorescent media actually form part of the planar surface being created.
The first electrodes are next formed over the surface of the planarizing layer. Any convenient conventional choice of deposition and patterning techniques can be employed. The planarizing layer protects the underlying fluorescent media and is itself capable of withstanding conventional patterning techniques, such as photolithographic patterning. The first electrodes are electrically conductive and light transmissive, preferably transparent. In a 20~~~4(i _g_ specifically preferred form the first electrodes are formed of indium tin oxide. A uniform layer of indium tin oxide can be formed into electrodes by conventional photolithographic patterning. For example, photoresist patterning followed by etching of the unprotected indium tin oxide areas with hydroiodic acid followed in turn by photoresist removal and rinsing provides the desired pattern of first electrodes. The planarizing layer and first electrodes possess a high degree of chemical stability, allowing photolithography to be conducted over their surfaces in subsequent fabrication steps without degradation.
In the preferred form of the invention a series of parallel walls 107 are next formed over the first electrodes and the surface of the planarizing layer adjacent the first electrodes, hereinafter collectively referred to as the deposition surface.
The walls are located at the shared boundaries of adjacent sub-pixel columns. The walls can be formed by any convenient conventional patterning technique.
In a simple, specifically preferred technique the walls are formed by spin coating a negative working photoresist onto the deposition surface. A single spin coating can conveniently produce a photoresist layer thickness of up to 20 ~tm, well in excess of the minimum wall height required for the devices of this invention.
Patterned exposure crosslinks the photoresist to an insoluble form in exposed areas while unexposed areas can be removed by development and washing techniques.
Crosslinking by exposure produces strong, relatively rigid walls.
Numerous alternative wall forming techniques are possible. Instead of spin casting and using a photoresist developer, two 'wet chemistry' steps, a photoresist layer can be formed on the support by laminating a photoresist coating on a flexible support, 2a~544fi such as transparent film, to the supporting surface.
In this form the photoresist is typically a monomer that is polymerized by imagewise exposure following lamination. After imagewise exposure stripping the film also removes the monomer in areas that are not exposed. No "wet chemistry" step is entailed.
In another wall forming technique the photoresist does not form the walls, but defines the wall pattern by its presence in areas surrounding the walls on the supporting surface. Fhotoresist layer formation can take any of the forms described above, but imagewise exposure is chosen to leave the photoresist in the areas surrounding the walls. Either a positive or negative working photoresist can be employed. Subsequently a wall forming material, such as silica, silicon nitride, alumina, etc., is deposited uniformly so that it overlies the photoresist where present and is deposited on the deposition surface in wall areas. After the walls are formed, the photoresist can be removed by any convenient conventional technique--e. g. solvent lift-off.
After the walls are formed along common boundaries of adjacent sub-pixel columns, the organic EL medium EL is next deposited by any convenient conventional vapor phase deposition technique over the walls and the remainder of the deposition surface. As shown in Figure 1 the left and lower edges of the deposition surface are free of the organic EL medium so that the portions of the electrode elements extending into these areas are available for external electrical lead attachments. These laterally extended portions of the electrode elements are commonly referred to as bonding pads. A mask, such as a strip of tape, along the edges of the substrate adjacent bonding pad sites can be used to define the deposition pattern of the organic EL medium. Alternatively, the organic EL

medium can be deposited over the entire deposition surface and then mechanically removed by abrasion.
Generally any vapor phase deposition technique can be employed known to be useful in depositing one or more layers of an organic EL medium.
It is generally preferred that the height of the walls be chosen to exceed the thickness of the organic EL
medium. In efficient device constructions the organic EL medium, even when present in multilayer forms, has a thickness of less than 1 ~tm (10,000 ~) and typically less than half this thickness. Hence achieving useful wall heights is well within the capabilities of conventional patterning techniques useful for wall formation.
Following deposition of the organic EL
medium, a source is provided for the metals used for deposition of the secand electrode elements. For efficient organic EL devices the second electrode elements require a metal having a lower (less than 4.0 eV) work function to be in contact with the organic EL
medium. One or more low work function metals alone or combination with one or more higher work function metals are deposited on the organic EL medium by any convenient directional (i.e.. line of sight) transport technique. To insure linear transport from their source to the organic EL medium surface the metal atoms are preferably transported through a reduced pressure atmosphere. This increases the mean free path of the metal ions during transport from the source to the surface of organic EL medium, thereby minimizing scattering and maintaining deposition in a directionally controlled manner. Generally the pressure of the ambient atmosphere during deposition is reduced so that the spacing between the source and the surface of the organic EL medium is less than the mean free travel path of the metal atoms (that is, less than ~08~448 the distance a metal atom on average travels before colliding an atom in the ambient atmosphere).
Conventional deposition techniques compatible with the directional transport requirements include vacuum vapor deposition, electron beam deposition, ion beam deposition, laser ablation and sputtering.
To achieve a deposition pattern of the second electrode elements in laterally spaced columns the deposition surface is positioned in relation to the source of metal to be deposited so that each wall is interposed between the source and an adjacent portion of the surface of the organic EL medium. When deposition is undertaken in such an orientation the interposed portions of the walls intercept metal atoms travelling from the source, thereby preventing metal deposition on the organic EL medium on one side of each wall. This provides the spacing between adjacent rows of second electrode elements. Convenient preferred ranges of orientations in relation to the source of metal atoms are established when the direction of travel of the metal atoms (or the line of sight between the source) and the deposition surface indicated by arrow A forms an angle 61 with the normal of the deposition surface (an axis normal to the deposition surface) of from about 10° to 60°, most preferably from about 15° to 45°.
Deposition of low (<4.0 eV) work function metal, alone or in combination of one or more higher work function metals, requires only that a continuous layer containing the low work function metal be deposited to achieve maximum efficiency of electron injection into the organic EL medium. However, to increase conductance (decrease resistance), it is preferred to increase the thickness of the second electrode elements beyond the 200 to 500 ~ thickness levels contemplated to provide a continuous layer.

2~8~44~

Although thick electrodes of up to 1 ~tm or even higher can be formed using the original metal composition, it is generally preferred to switch deposition after initial formation of continuous layers containing low ~5 work function metal so that only relatively higher work function (and hence less chemically reactive) metals are deposited. Fox example, an initial continuous layer of magnesium (a preferred low work function metal) and silver, indium or aluminum would preferably be increased in thickness for the purpose of reducing second electrode element resistance by depositing a convenient higher work function metal commonly used in circuit fabrication, such as gold, silver, copper and/or aluminum. The combination of a lower work function metal at the interface of the organic EL
medium and a higher work function metal completing the thickness of the overlying second electrode elements is particularly advantageous, since the higher electron injection efficiencies produced by a lower work function metal are fully realized even though the lower work function metal is limited to the second electrode element interface with the organic EL medium while the presence of the higher work metal increases the stability of the second electrode elements. Hence, a combination of high injection efficiency and high electrode element stability is realized by this arrangement.
In operation a selected pattern of light emission from the device 100 is produced that can be seen by viewing the bottom surface of the transparent support 105. In a preferred mode of operation the device is stimulated to emit by sequentially stimulating one row of pixels at a time and repeating the stimulating sequence at a rate chosen so that the interval between repeated stimulations of each row is less than the detection limit of the human eye, typically less than about 1/60th of a second. The viewer sees an image formed by emission from all stimulated rows, even though the device at.any instant is emitting light from only one row.
To create the desired image pattern, the a, b and c elements of each of the second electrodes are independently electrically addressed while the first electrode R1 is electrically biased to support emission. If, for example, only green emission is wanted and that in only the columns including second electrodes C2, C3 and C4, the a elements in these columns are biased to support emission while the remaining second electrode elements are not electrically biased or given a bias of a polarity opposite that required to support emission.
Immediately following emission in the desired pattern from the row of pixels joined by first electrode R1, a new pattern of stimulation is supplied to the second electrode elements, and the first electrode element R2 is next biased to stimulate the desired pattern of emission from the row of pixels it joins. Stimulation of patterned emission from successive rows is achieved by repeating the procedure described above while biasing successive first electrodes.
The organic EL medium EL is selected so that it emits in the blue region of the spectrum. In the blue emitting sub-pixels Hp light emitted by the organic EL medium penetrates the first electrodes, the planarizing layer (when present) and the support and is seen by the viewer as blue light.
In the green and red emitting pixels the same blue emitting organic EL medium is employed as in the blue emitting sub-pixels. The blue light emitted again penetrates the first electrodes and the planarizing layer (when present), but in the sub-pixels GD and Rp the fluorescent media Q and R, respectively, intercept 2U~~446 and absorb the blue light emitted by the organic EL
medium. The blue light stimulates fluorescent emission in the green or red.
A very significant advantage of absorbing blue light emission from the organic EL medium and reemitting longer wavelength, green or red, light by fluorescence is that the efficiency of light emission can be very much superior to that achieved employing a color filter array in combination with a white light emitting organic EL medium. In the latter arrangement a theoretical maximum efficiency of only 33 percent is possible, since each sub-pixel of the color filter array absorbs and does not transmit two-thirds of the photons it receives. Further, aside from efficiency losses due to the color filter array, it is to be noted that the organic EL medium cannot be optimized to emit in any one portion of the visible spectrum, but must emit throughout the visible spectrum. This places a further efficiency burden on this conventional arrangement and results in its overall efficiency as a practical matter being substantially less than 33 percent.
The efficiency of the present invention is controlled by (a) the efficiency of emission of blue light by the organic EL medium, (b) the efficiency with which the blue light is absorbed by the fluorescent media, and (c) the efficiency with which fluorescent media is stimulated to emit longer wavelength light.
Considering (a) first, it is apparent that the blue emitting organic EL medium employed in the device 100 can be selected from a variety of highly efficient materials that would be highly inefficient in providing emission in each of the blue, green and red portions of the spectrum (i.e., in providing white light emission).
Turning to (b), high levels of efficiency can be realized in absorbing blue light emitted by the organic 20~~~4~

EL medium. There is no reason in theory why 100% of the blue light emitted can not be absorbed by the fluorescent medium. It is contemplated that in all instances at least 50% and preferably at least 80% of blue light emitted in the green and red sub-pixels can be absorbed. Turning to (c), a variety of fluorescent materials are known that are capable of emitting at least 50% of the light they absorb and emission efficiencies in excess of 80% of light absorption are contemplated. Thus, within readily attainable levels of blue light absorption and longer wavelength fluorescence efficiencies, the green and red sub-pixels are capable of delivering to the viewer substantially greater than half the number of photons received from the blue emitting organic EL medium. For example, assuming an absorption efficiency of 80% and a fluorescence efficiency of 80%, both of which are readily attainable, 64% of the photons received from the organic EL medium are transmitted to the viewer in areas containing the fluorescent medium. In the blue sub-pixel areas, the efficiency is approximately 100%, since light absorption in the transparent electrode, planarizing layer (when present) and support can be negligible or nearly negligible.
Another significant advantage of the device 100 is that no patterning of the organic EL medium in pixel areas is required. This avoids the significant degradations in performance of conventional organic EL
devices after patterning. For example, the construction of the device 100 requires no wet chemistry for patterning during or after deposition of the organic EL medium. No photolithographic patterning steps are required and no wet etching steps are required to be performed after the organic EL medium is deposited. This protects both the organic EL medium 2~&~~4~

and the overlying second electrode elements from degradation.
The device 100 has the capability of full color imaging. Employing blue, green and red primary color emissions, the following emission combinations are possible from each pixel:
(a) stimulate one sub-pixel to emit blue;
(b) stimulate one sub-pixel to emit green;
(c) stimulate one sub-pixel to emit red;
(d) stimulate two sub-pixels to emit blue and green, creating the perception of cyan;
(e) stimulate two sub-pixels to emit blue and red, creating the perception of magenta;
(f) stimulate two sub-pixels to emit green and red, creating the perception of yellow;
(g) stimulate all sub-pixels to create white light emission; and (h) stimulate none of the sub-pixels to provide a dark, essentially black background.
Although the multicolor image display device 100 fully satisfies the requirements of the invention, the device exhibits some disadvantages. First, referring to Figure 1, it is apparent that in successively biasing each first electrode it must carry current to each of the pixels in the same row that is to emit light. Hence, the current carried by each first electrode is the sum of the currents carried by each of the second electrode elements in stimulating a row of pixels to emit light. The disadvantage of this arrangement is that the first electrodes must be light transmissive for light emissions to be seen and their thicknesses must be limited to retain this property.
However, limiting first electrode thickness also limits conductance.
If the pixels are addressed in columns rather than rows, each of the second electrode elements a, b 2~~~~4~
and c must carry the current of all pixels in the same column. Although the thickness of the second electrode elements can and usually does exceed that of the first electrodes, the width of the second electrode elements must be less than the width of a sub-pixel. As a consequence, the conductance of the second electrode elements is also restricted. Further, addressing the pixels column by column is unattractive, since in an array having an equal number of pixels in columns and rows the addressing rate for columns must be three times that employed for rows, since each column contains three second electrode elements. Since the time in which the sub-pixels in a column can be biased to emit light is reduced to one third that required for row by row addressing, the biasing voltage must be increased as compared to row addressing to maintain a sub-pixel coulomb level and emission level during biasing equal to that obtained with row by row addressing. Increased biasing voltages and tripled addressing rates for comparable emission properties represent a significant disadvantage.
The multicolor organic EL image display device 200 shown in Figure 4 exhibits all of the imaging capabilities of the device 100 while at the same time overcoming its disadvantages noted above.
Except as specifically noted, the features of the device 200 can take any of the forms described in connection with the device 100 and therefore require no further explanation.
The first electrodes C10, C11, C12, C13, C14, C15, C16 and C17 of device 200 are each divided into elements c, 8 and e. These first electrode elements have the light transmissive properties of the first electrodes of device 100 and, like the first electrodes of device 100, are formed prior to depositing the organic EL medium. Each first electrode element c z~s~~~~~

forms a part of and joins sub-pixels Gp in the same column; each first electrode element d forms a part of and joins sub-pixels Rp in the same column; and each third electrode element a forms a part of and joins sub-pixels Bp in the same column. The second electrodes R10, R11 and R12 can be constructed of the same materials and in the same thickness ranges as the second electrode elements of device 100, but are arranged in rows rather than columns. The row arrangement allows the second electrodes to be wider than the second electrodes of device 100.
The electrode arrangement of the device 200 achieves higher electrode conductances than can be realized in device 100. In addressing a row of pixels each of the first electrode elements c, d and a is biased independently to achieve the desired pattern of emission from the pixels in one row. Simultaneously one of the second electrodes is biased to stimulate emission within a selected row. Each of the first electrode elements stimulates only one sub-pixel and carries only the current of one sub-pixel. The second electrode in the selected row carries the current of all the sub-pixels stimulated to emit in that row.
Since the second electrodes need not be light transmissive and, hence, can be much thicker as well as wider than the first electrode elements, the conductance of the electrodes of device 200 can be higher than that of the electrodes of device 100.
The construction of one of the pixels P of the device 200 is shown in Figures 5 and 6. The support 205, the patterned fluorescent media G and R, and the planarizing layer 201 are identical to corresponding elements in device 100. Except far the differences in patterning noted above, the first electrode elements c, d and e, the organic EL medium EL

i ~~ i and the second electrodes are constructed similarly as described in connection with device 100.
In comparing Figures 2 and 6 it is apparent that the device 200 offers a significant structural advantage in the construction of the walls Z07. These walls are located at the shared boundaries of adjacent rows of pixels. The device 200 contains fewer walls than device 100. Whereas in device 100 the number of walls is three times the number of pixel columns (plus one additional wall), in device a00 the number of walls is equal to the number of rows (plus one additional wall). For arrays containing an equal number of pixels in rows and columns there is approximately a 3 to 1 reduction in the number of walls that need be formed.
The materials of the image display organic EL
devices of this invention can take any of the forms of conventional organic EL devices, such as those of Scozzafava, cited above; Tang U.S. Patent 4,356,429;
VanSlyke et al U.S. Patent 4,539,507; VanSlyke et al U.S. Patent 4,720,432; Tang et al U.S. Patent 4,885,211; Tang et al U.S. Patent 4,769,292; Perry et al U.S. Patent 4,950,950; Littman et al U.S. Patent No.
5,059,861; VanSlyke U.S. Patent 5,047,687;
Canadian Patent 2,046,220; VanSlyke et al U.S. Patent 5,059,862; VanSlyke et al U.S. Patent 5,061,617.
A specifically preferred support for the devices of the invention is a transparent glass support. The preferred first electrodes of the devices of this invention are transparent indium tin oxide electrodes coated directly on the glass support.
Instead of employing indium tin oxide, tin oxide or a similar electrically conductive transparent oxide, the first electrode elements can be formed of thin, light transmissive layers of any of the high (e. g., greater than 4.0 eV) work function metals. Chromium and gold mixtures are particularly contemplated for forming the first electrodes. The first electrodes are typically in the range of from 1 Eun (10,000 ~) to 500 ~ in thickness, preferably in the range of from 3000 ~ to 1000 ~ in thickness.
As illustrated in Figure 7, the organic EL
medium EL coated over the first electrodes, represented by a first electrode E1, is preferably made up of a sequence of four superimposed layers. The layer in direct contact with each first electrode is a hole injecting layer HI that receives holes from the first electrode E1 when it is positively biased relative to a second electrode E2. In contact with and overlying the hole injecting layer is a hole transporting layer HT.
The hole injecting layer and the hole transporting layer together form a hole injecting and transporting zone HIT. Overlying and in contact with the hole injecting and transporting zone is an electron injecting and transporting zone EIT formed by an electron injecting layer EI in contact with the second electrode and a luminescent layer LU. 4rhen the second electrode E2 is negatively biased in relation to the first electrode E1, electrons are received from the second electrode by the layer EI which in turn injects electrons into the luminescent layer LU. Concurrently holes are injected from the hole transporting layer HT
into the luminescent layer. Hole-electron recombin-ation in layer LU results in electroluminescence.
A functioning device requires only the luminescent layer LU between and in contact with the first and second electrodes. A marked increase in efficiency is realized when a two layer organic EL
medium construction is employed consisting of the luminescent layer LU and the hole injecting layer HI.
Each of the layers Ei and HT independently contribute to achieving the highest levels of stability and ~~~r- 3 efficiency. The the organic EL medium can be constructed of from one to four of the layers described, with only the luminescent layer LU being essential to operability.
The hole injecting layer is preferably comprised of a porphyrinic compound of the type disclosed by Adler U.S. Patent 3,935,031 or Tang U.S. Patent 4,356,429.
Preferred porphyrinic compounds are those of structural formula (I):
(I) T2 Tt t ~ ~ t T N ~ T
I ~N-M-N ~ I
T2 Q N ~~ T2 i T' T2 wherein Q is -N= or -C(R)=;
M is a metal, metal oxide, or metal halide;
R is hydrogen, alkyl, aralkyl, aryl, or alkaryl, and T1 and T2 represent hydrogen or together complete a unsaturated 6 membered ring, which can include substituents, such as alkyl or halogen.
Preferred alkyl moieties contain from about 1 to 6 carbon atoms while phenyl constitutes a preferred aryl moiety.
In an alternative preferred form the porphyrinic compounds differ from those of structural formula (I) by substitution of two hydrogens for the metal atom, as indicated by formula (II):
(II) TZ T' T' Q N ~ T~
I_~ N H N ~ I
T2 Q N \T2 ,Q
T' TZ
Highly preferred examples of useful porphyrinic compounds are metal free phthalocyanines and metal containing phthalocyanines. 4~lhile the porphyrinic compounds in general and the phthalo-cyanines in particular can contain any metal, the metal preferably has a positive valence of two or higher. Exemplary preferred metals are cobalt, magnesium, zinc, palladium, nickel, and, particularly, copper, lead, and platinum.
Illustrative of useful porphyrinic compounds are the following:
PC-1 Porphine PC-2 1,10,15,20-Tetraphenyl-21H,23H-porphine copper (II) PC-3 1,10,15,20-Tetraphenyl-21H,23H--porphine zinc (II) PC-4 5,10,15,20-Tetrakis(pentafluorophenyl)-21H,23H-porphine PC-5 Silicon phthalocyanine oxide PC-6 Aluminum phthalocyanine chloride PC-7 Phthalocyanine (metal free) 2U8~~4~

PC-8 Dilithium phthalocyanine PC-9 Copper tetramethylphthalocyanine PC-10 Copper phthalocyanine PC-11 Chromium phthalocyanine fluoride PC-12 Zinc phthalocyanine PC-13 Lead phthalocyanine PC-14 Titanium phthalocyanine oxide PC-15 Magnesium phthalocyanine PC-16 Copper octamethylphthalocyanine The hole transporting layer preferably contains at least one hole transporting aromatic tertiary amine, where the latter is understood to be a compound containing at least one trivalent nitrogen atom that is bonded only to carbon atoms, at least one of which is a member of an aromatic ring. In one form the aromatic tertiary amine can be an arylamine, such as a monoarylamine, diarylamine, triarylamine, or a polymeric arylamine. Exemplary monomeric triarylamines are illustrated by Klupfel et al U.S.
Patent 3,180,730. Other suitable triarylamines substituted with vinyl or vinylene radicals and/or containing at least one active hydrogen containing group are disclosed by Brantley et al U.S. Patents 3,567,450 and 3,658,520.
A preferred class of aromatic tertiary amines are those which include at least two aromatic tertiary amine moieties. Such compounds include those represented by structural formula (III):
(III) \ /
G
wherein Q1 and Q2 are independently aromatic tertiary amine moieties and G is a linking group such an arylene, cyclo-alkylene, or alkylene group or a carbon to carbon bond.
A particularly preferred class of triarylamines satisfying structural formula (III) and containing two triarylamine moieties are those satisfying structural formula (IV):
(IV) I
R1_ C _ R3 I
R~
where R1 and R2 each independently represents a hydrogen atom, an aryl group or alkyl group or R1 and R2 together represent the atoms completing a cycloalkyl group and R3 and R4 each independently represents an aryl group which is in turn substituted with a diaryl substituted amino group, as indicated by structural formula (V):
(V) - N

wherein R5 and R6 are independently selected aryl groups.
Another preferred class of aromatic tertiary amines are tetraaryldiamines. Preferred tetraaryldiamines include two diarylamino groups, such as indicated by formula (IV), linked through an arylene group. Preferred tetraaryldiamines include those represented by formula (VI).

2~~~44~

(VI) \ /
N Aren N
/ \
Ar R9 wherein Are is an arylene group, n is an integer of from 1 to 4, and Ar, R7, R8, and R9 are independently selected aryl groups.
The various alkyl, alkylene, aryl, and arylene moieties of the foregoing structural formulae (III), (IV), (V), and (VI) can each in turn be substituted. Typical substituents including alkyl groups, alkoxy groups, aryl groups, aryloxy groups, and halogen such as fluoride, chloride, and bromide.
The various alkyl and alkylene moieties typically contain from about 1 to 5 carbon atoms. The cycloalkyl moieties can contain from 3 to about 10 carbon atoms, but typically contain five, six, or seven ring carbon atoms--e. g., cyclopentyl, cyclohexyl, and cycloheptyl ring structures. The aryl and arylene moieties are preferably phenyl and phenylene moieties.
Representative useful aromatic tertiary amines are disclosed by Berwick et al U.S. Patent 4,175,960 and Van Slyke et al U.S. Patent 4,539.507.
Berwick et al in addition discloses as useful hole transporting compounds N substituted carbazoles, which can be viewed as ring bridged variants of the diaryl and triarylamines disclosed above.
Following the teachings of VanSlyke et al U.S. Patent 5,061,569, cited above, it is possible to achieve higher organic EL device stabilities both during short term and extended operation by 2~1~a~4~

substituting for one or more of the aryl groups attached directly to a tertiary nitrogen atom in the aromatic tertiary amines described above an aromatic moiety containing at least two fused aromatic rings.
The best combination of both short term (0-50 hours) and long term (0-300+ hours) of operation are achieved when the aromatic tertiary amines are those which (1) are comprised of at least two tertiary amine moieties and (2) include attached to a tertiary amine nitrogen atom an aromatic moiety containing at least two fused aromatic rings. The fused aromatic ring moieties of the tertiary amines can contain 24 or more carbon atoms and preferably contain from about 10 to 16 ring carbon atoms. While unsaturated 5 and 7 membered rings can be fused to six membered aromatic rings (i.e., benzene rings) to form useful fused aromatic ring moieties, it is generally preferred that the fused aromatic ring moiety include at least two fused benzene rings. The simplest form of a fused aromatic ring moiety containing two fused benzene rings is naphthalene. Therefore, the preferred aromatic ring moieties are naphthalene moieties, where the latter is understood to embrace all compounds containing a naphthalene ring structure. In manovalent form the naphthalene moieties are naphthyl moieties, and in their divalent form the naphthalene moieties are naphthylene moieties.
Illustrative of useful aromatic tertiary amines are the following:
ATA-1 1,1-Bis(4-di-p-tolylaminophenyl)cyclohexane ATA-2 1,1-Bis(4-di-p-tolylaminophenyl)-4-phenyl-cyclohexane ATA-3 4,4 " '-Bis(diphenylamino)quaterphenyl ATA-4 Bis(4-dimethylamino-2-methylphenyl)phenylmethane 20~54~46 ATA-5 N,N,N-Trip-tolyl)amine ATA-6 4-(di-p-tolylamino)-4'-[4(di-p-tolylamino)-styryl]stilbene ATA-7 N,N,N',N'-Tetra-p-tolyl-4,4'-diaminobiphenyl ATA-8 N,N,N',N'-Tetraphenyl-4,4'-diaminobiphenyl ATA-9 N-Phenylcarbazole ATA-10 Poly(N-vinylcarbazole) ATA-11 4,4'-Bis[N-(1-naphthyl)-N-phenylamino]biphenyl ATA-12 4,4"-Bis[N-(1-naphthyl)-N-phenylamino]-p-ter-phenyl ATA-13 4,4'-Bis[N-(2-naphthyl)-N-phenylamino]biphenyl ATA-14 4,4'-Bis[N-(3-acenaphthenyl)-N-phenylamino]bi phenyl ATA-15 1,5-Bis[N-(1-naphthyl)-N-phenylamino]naphthalene ATA-16 4,4'-Bis[N-(9-anthryl)-N-phenylamino]biphenyl ATA-17 4,4"-Bis[N-(1-anthryl)-N-phenylamino]-p-ter-phenyl ATA-18 4,4'-Bis[N-(2-phenanthryl)-N-phenylamino]bi-phenyl ATA-19 4,4'-Bis[N-(8-fluoranthenyl)-N-phenylamino]bi-phenyl ATA-20 4,4'-Bis[N-(2-pyrenyl)-N-phenylamino]biphenyl ATA-21 4,4'-Bis[N-(2-naphthacenyl)-N-phenylamino]bi phenyl ATA-22 4,4'-Bis[N-(2-perylenyl)-N-phenylamino]biphenyl ATA-23 4,4'-Bis[N-(1-coronenyl)-N-phenylamino]biphenyl ATA-24 2,6-Bis(di-~-tolylamino)naphthalene ATA-25 2,6-Bis[di-(1-naphthyl)amino]naphthalene ATA-26 2,6-Bis[N-(1-naphthyl)-N-(2-naphthyl)amino]naph-thalene ATA-27 4,4"-Bis[N,N-di(2-naphthyl)amino]terphenyl ATA-28 4,4'-Bis{N-phenyl-N-[4-(1-naphthyl)phenyl]-amino}biphenyl ATA-29 4,4'-Bis[N-phenyl-N-(2-pyrenyl)amino]biphenyl ATA-30 2,6-Bis[N,N-di(2-naphthyl)amine]fluorene ATA-31 4,4"-Bis(N,N-di-p-tolylamino)terphenyl i i1 i ATA-32 Bis(N-1-naphthyl)(N-2-naphthyl)amine Any conventional blue emitting organic electroluminescent layer can be employed to form the layer LU. The term blue emitting" is herein employed to indicate that visible emission occurs principally in the blue portion of the spectrum--that is, in the spectral region of from 400 to 500 nm. However, if the wavelength of peak emission is too near the green, a significant green emission can accompany the blue emission. It is therefore preferred to select blue emitting materials that exhibit a peak emission wavelength of less than 480 nm. Note that a peak emission in the near ultraviolet is not detrimental to the obtaining a blue hue of emission. Thus, so long as the electroluminescent layer is blue emitting it is immaterial whether peak emission occurs at wavelengths longer than or shorter than 400 nm.
It is preferred to employ mixed ligand aluminum chelates of the type disclosed by U.S. Patent 5,150,006.
In a specifically preferred form the mixed ligand aluminum chelates therein disclosed include bis(Rs-8-quinolinolato)-(phenolato)aluminum(III) chelate, where Rs is a ring substituent of the 8-quinolinolato ring nucleus chosen to block the attachment of more than two 8-quinolino-lato ligands to the aluminum atom. These compounds can be represented by the formula:
(VII) (Rs_Q) 2-p,l-0-L
where Q in each occurrence represents a substituted 8-quinolinolato ligand, RS represents an 8-quinolinolato ring substituent chosen to block sterically the attachment of more than two substituted 8-quinolinolato ligands to the aluminum atom, O-L is phenolato ligand, and L is a hydrocarbon of from 6 to 24 carbon atoms comprised of a phenyl moiety.
The advantage of employing an aluminum chelate with two substituted 8-quinolinolato ligands and a phenolato ligand is that all of the desirable physical properties of tris(8-quinolinolato)alumin-um(III) chelates, the preferred green emitting luminophors of organic EL devices, are retained while emission is shifted to the blue region of the spectrum.
The presence of the phenolato ligand is responsible for shifting emissions to the blue portion of the spectrum. As employed herein the term "phenolato ligand" is employed in its art recognized usage to mean a ligand bonded to the aluminum atom by the deprotonated hydroxyl group of a phenol.
In its simplest form the phenolato ligand can be provided by deprononation of hydroxybenzene.
Organic EL device performance has demonstrated that peak emission at a shorter wavelength than 500 nm and acceptable device stability (retention of at least a half of initial luminescent intensity for more than 50 hours) can be realized.
In an effort to improve performance, substituted phenols were next investigated. It was observed that methoxy and dimethoxy substituted phenolato ligands exhibited relatively weak luminescent intensities. Since methoxy substituents are electron donating, phenols were also investigated with strongly electron withdrawing substituents, such as halo, cyano 2~~~~~6 and a-haloalkyl substituents. Aluminum chelates with these ligands, though luminophors, did not undergo successful vapor phase conversions.
It has been determined that the preferred phenolato ligands for the aluminum chelates of formula VII are derived from HO-L phenols, where L is a hydrocarbon of from 6 to 24 carbon atoms comprised of a phenyl moiety. This includes not only hydroxybenzene, but a variety of hydrocarbon substituted hydroxybenzenes, hydroxynaphthalenes and other fused ring hydrocarbons. Since monomethyl substitution of the phenyl moiety shorten emission wavelengths, it is preferred that the phenolato ligand contain at least 7 carbon atoms. Generally there is little advantage to be gained by employing phenolato ligands with very large numbers of carbon atoms. However, investigations of phenolato ligands with 18 aromatic ring carbon atoms have revealed high levels of stability. Thus, the phenolato ligands preferably contain from 7 to 18 total carbon atoms.
Aliphatic substituents of the phenyl moiety of phenolato ligand are contemplated to contain from 1 to 12 carbon atoms each. Alkyl phenyl moiety substituents of from 1 to 3 carbon atoms are specifically preferred, with the best overall characteristics having been observed to be produced with methyl substituents.
Aromatic hydrocarbon substituents of the phenyl moiety are preferably phenyl or naphthyl rings.
Phenyl, diphenyl and triphenyl substitution of the phenyl moiety have all been observed to produce highly desirable organic EL device characteristics.
Phenolato ligands derived from a or naphthols have been observed to produce aluminum chelates of exceptional levels of stability. A limited degree of emission shifting to shorter wavelengths is 208~44~

also realized, similar to that exhibited by hydroxybenzene derived phenolato ligands. By employing naphtholato ligand containing aluminum chelates in combination with blue emitting fluorescent dyes, described below, highly desirable device constructions are possible.
From comparisons of ortho, meta and para substituted homologues of the various phenolato ligands it has been determined that little, if any, difference in performance is attributable to the position on the phenyl moiety ring occupied by the hydrocarbon substituent.
In a preferred form the aluminum chelates satisfy the following formula:
(VIII) L' L~
(RS-Q)Z-A i-0 L5 \L4 where Q and RS are as defined above and L1, L2, L3, L4 and L5 collectively contain 12 or fewer carbon atoms and each independently represent hydrogen or hydrocarbon groups of from 1 to 12 carbon atoms, with the proviso that L1 and L2 together or L2 and L3 together can form a fused benzo ring.
Although either or both of the 8-quino-linolato rings can contain substituents other than the steric blocking substituent, further substitution of the rings is not required. It is appreciated further that more than one substituent per ring can contribute to steric blocking. The various steric blocking substituent possibilities are most easily visualized by reference to the following formula:
(IX) R6 R' Rs / \
- ~A i-p- L
R4 \ ~N
R \R2 where L can take any form described above and R2 to R~
represent substitutional possibilities at each of ring positions 2 to 7 inclusive of the 8-quinolinolato rings. Substituents at the 4, 5 and 6 ring positions are not favorably located to hinder sterically the bonding of three 8-quinolinolato nuclei to a single aluminum atom. While it is contemplated that large substituents at the 3 or 7 ring positions could provide sufficient steric hindrance, the incorporation of bulky substituents substantially increases molecular weight without enhancing molecular performance and therefore detracts from overall performance. On the other hand, the 2 ring position is suited to provide steric hindrance, and even a very small substituent (e.g., a methyl group) in one of these ring positions provides an effective steric blocking substituent. For synthetic convenience it is specifically preferred that steric blocking substituents be located in the 2 ring positions. As employed herein the term 'steric blocking is employed to indicate that the Rs-Q ligand ..~ 2os~~~~

is incapable of competing for inclusion as the third ligand of the aluminum atom.
Although the phenolato ligand is primarily relied upon to obtain blue emission, it has been observed that substituents to the 8-quinolinolato rings can also perform useful hue shifting functions. The quinoline ring consists of fused benzo and pyrido rings. When the pyrido ring component of the quinoline ring is substituted with one or more electron donating substituents the effect is to shift the hue of emission away from the green region of the spectrum and toward a more primary blue emission. Electron donating substituents at the ortho and para positions of the pyrido ring (that is, the 2 and 4 positions of the quinoline ring) particularly influence the hue of emission, while the meta position on the pyrido ring (the 3 position on the quinoline ring) has a comparatively small influence on the hue of emission.
It is, in fact, recognized that an electron accepting substituent could, if desired, be located at the 3 ring position while retaining a blue emission characteristic. Although steric hindrance is entirely independent of electron donating or accepting properties and, thus, R2 can in theory take the form of either an electron donating or accepting group, it is preferred to choose R2 from among electron donating groups. By adding a second electron donating group R4 a further shift in hue away from the green portion of the spectrum is achieved. R3, when present, can take any synthetically convenient form, but is preferably also electron donating.
It is well within the skill of the art to determine whether a particular substituent is electron donating or electron accepting. The electron donating or accepting properties of several hundred of the most common substituents, reflecting all common classes of ~0~~~4fi substituents have been determined, quantified and published. The most common quantification of electron donating and accepting properties is in terms of Hammett a values. Substituents with negative Hammett a values are electron donating while those with positive Hammett a values are electron accepting. Hydrogen has a Hammett a value of zero, while other substituents have Hammett a values that increase positively or negatively in direct relation to their electron accepting or donating characteristics. Lange's Handbook of Chemistry, 12th Ed., McGraw Hill, 1979, Table 3-12, pp. 3-134 to 3-138, lists Hammett 6 values for a large number of commonly encountered substituents. Hammett a values are assigned based on phenyl ring substitution, but they provide a workable guide for qualitatively selecting electron donating and accepting substituents for the quinoline ring.
Taking all factors together, steric blocking, synthetic convenience, and electron donating or accepting properties, R2 is preferably an amino, oxy or hydrocarbon substituent. Adequate steric hindrance is provided when R2 is methyl and is the sole 8-quinolino-lato ring substituent (i.e., each of R3, R4, R5, R6 and R7 is hydrogen). Thus, any amino, oxy or hydrocarbon substituent having at least 1 carbon atom falls within the preview of preferred substituents. Preferably no more than 10 carbon atoms are present in any one hydrocarbon moiety and optimally no more than 6 carbon atoms. Thus, R2 preferably takes the form of -R', -OR' or -N(R')R', where R' is a hydrocarbon of from 1 to 10 carbon atoms and R' is R' or hydrogen. Preferably R2 contains 10 or fewer carbon atoms and optimally 6 or fewer carbon atoms.
R3 and R4 for the reasons set forth above can take a broader range of forms than R2, but are specifically contemplated to be selected from among the 248~44~

same group of preferred substituents as R2. Since 3 and 4 ring position substitution is not required, R3 and R4 can additionally be hydrogen.
Since 5, 6 or 7 ring position substitution is not required, R5, R6 and R~ can represent hydrogen. In preferred forms R5, R6 and R~ can be selected from synthetically convenient electron accepting substituents, such as cyano, halogen, and a-haloalkyl, a-haloalkoxy, amido, sulfonyl, carbonyl, carbonyloxy and oxycarbonyl substituents containing up to 10 carbon atoms, most preferably 6 or fewer carbon atoms.
The following constitute specific examples of preferred mixed ligand aluminum chelates satisfying the requirements of the invention:
PC-1 Bis(2-methyl-8-quinolinolato)(phenolato)-aluminum(III) ~ 0 A I-~ \ /
,N
CHy PC-2 Bis(2-methyl-8-quinolinolato)(ortho-cres-olato)aluminum(III) / \ 0 _ _ A I -0 \ /
\ ,N

~~8~44~

PC-3 Bis(2-methyl-8-quinolinolato)(meta-cres-olato)aluminum(III) CHy ~ 0 A I-~ \ /

PC-4 Bis(2-methyl-8-quinolinolato)(para-cres-olato)aluminum(III) / \ 0 -_A I_0 \ / CH3 \ ,N

PC-5 Bis(2-methyl-8-quinolinolato)(ortho-phenyl-phenolato)aluminum(III) / \ 0 _ v \ ~N ~ i ~CH3 PC-6 Bis(2-methyl-8-quinolinolato)(meta-phenyl-phenolato)aluminum(III) / \ 0 [
A I -C ~ ~
,N i PC-7 Bis(2-methyl-8-quinolinolato)(para-phenyl-phenolato)aluminum(III) A I-~- \ / \ /
,N
~Hy PC-8 Bis(2-methyl-8-quinolinolato)(2,3-dimethyl-phenolato)aluminum(III) ~ 0 A I-W \ /

a. 2~~~44 ~

PC-9 Bis(2-methyl-8-quinolinolato)(2,6-dimethyl-phenolato)aluminum(III) ,N
CNy J CHI

PC-10 Bis(2-methyl-8-quinolinolato)(3,4-dimethyl-phenolato)aluminum(III) / \ 0 _ -- A I-0'-' \ / CH3 \ ,N

PC-11 Bis(2-methyl-8-quinolinolato)(3,5-dimethyl-phenolato)aluminum(III) / \ 0 -- 1A I-0- \ /
\ ,N

Nos~~~~

PC-12 Bis(2-methyl-8-quinolinolato)(3,5-di-tert-butylphenolato)aluminum(III) C~H9- t / \ 0 _ -- A I -0 - \ /
\ ,N
C4H9_ t PC-13 Bis(2-methyl-8-quinolinolato)(2,6-diphenyl-phenolato)aluminum(III) / \ CsHS
0 _ _ - A I -0 - \ /
\ ~N
CH3 CsHS

PC-14 Bis(2-methyl-8-quinolinolato)(2,4,6-tri-phenylphenolato)aluminum(III) CsHa 0 _ -A I-0- \ / CsHS
\ ~N
CH3 CsHS

.r 2a~~~~~

PC-15 Bis(2-methyl-8-quinolinolato)(2,3,6-tri-methylphenolato)aluminum(III) / \ CH3 0 _ - A I -0 - \ /
\ ,N

PC-16 Bis(2-methyl-8-quinolinolato)(2,3,5,6-tetramethylphenolato)aluminum(III) / \ 0 _ -A I -0 - \ /
\ ~N

PC-17 Bis(2-methyl-8-quinolinolato)(1-naphthol-ato)aluminum(III) ~ o A I-0 \ /
~N
CHy \ /

~~~~~~ 4~

PC-18 Bis(2-methyl-8-quinolinolato)(2-naphthol-ato)aluminum(III) / ~ 0 _ 'A I_p w w ,N ~ i ~ i PC-19 Bis(2,4-dimethyl-8-quinolinolato)(ortho-phenylphenolato)aluminum(III) i / ~ 0 _A I_0 w ._ .
CH3 ~ ,N ~ i PC-20 Bis(2,4-dimethyl-8-quinolinolato)(para-phenylphenolato)aluminum(III) / ~ 0 AI-0 ~ / ~ /
CH3 ~ ,N

PC-21 Bis(2,4-dimethyl-8-quinolinolato)(meta-phenylphenolato)aluminum(III) CH3 ~ ,N
w CH3 I ~

PC-22 Bis(2,4-dimethyl-8-quinolinolato)(3,5-di-methylphenolato)aluminum(III) A I -0 ~ /
CH3 ~ ~N

PC-23 Bis(2,4-dimethyl-8-quinolinolato)(3,5-di-tert-butylphenolato)aluminum(III) C~H9-t / ~ 0 _ CH3 ~ ,N
C~H9-t ~~~~~4~

PC-24 Bis(2-methyl-4-ethyl-8-quinolinolato)(para-cresolato)aluminum(III) / \ a _ _A I_0 \ / CH3 C2H5 \ ,N

PC-25 Bis(2-methyl-4-methoxy-8-quinolinolato)-(para-phenylphenylato)aluminum(III) / \ ~ _ _ AI ~ \ / \ /
C H30 \ ,N

PC-26 Bis(2-methyl-5-cyano-8-quinolinolato)-(ortho-cresolato)aluminum(III) NC / \ p - ~ A I -C ' w \ iN

I II I

PC-27 Bis(2-methyl-6-trifluoromethyl-8-quinolin-olato)(2-naphtholato)aluminum(III) - 1A I-0 ' w' ~ ,N i i Instead of employing a bis(Rs-8-quinolino-lato)(phenolato)aluminum(III)chelate for blue emission as described above it is alternatively contemplated to employ for the blue emitting luminescent layer a blue emitting bis(Rs-8-quinolinolato)aluminum(III)-~1-oxo-bis(Rs-8-quinolinolato)aluminum(III) compound. The use of these compounds in organic EL devices is taught by U.S. Patent 5,151,629. These compounds broadly satisfy the formula:
(X) (RS-S2) 2-Al-~-A1- (S2-Rs~z and in a specific preferred form satisfy the formula:

2~~5~4~

(XI) Rs R~ R~ Rs Rs / \ ~ ~ / \ Rs R4 \ ~N wN' / R4 R ~R2 R2 ~R3 where Q, Rs and R2 to R~ are as previously described in connection with formulae VII and VIII.
The following constitute specific examples of preferred compounds satisfying formulae X and XI:
BA-1 Bis(2-methyl-8-quinolinolato)aluminum(III)-~1-2Q~~~1~6 oxo-bis(2-methyl-8-quinolinolato)aluminum(III) ,N ~N~

BA-2 Bis(2,4-dimethyl-8-quinolinolato)alumin-um(III)-~-oxo-bis(2,4-dimethyl-8-quinolinolato)-aluminum(III) 0 _ 0 - A I-~-A I
CH3 ~ ,N ~N~ ~ CH3 cH3 2 cH3 2 BA-3 Bis(4-ethyl-2-methyl-8-quinolinolato)alumin-um(III)-~1-oxo-bis(4-ethyl-2-methyl-8-quinolinolato)-aluminum(III) / ~ 0 0 - 'A I -C-A I -Cz"s ~ ,N ~Nv / Cz"s c "3 2 c"3 2 BA-4 Bis(2-methyl-4-methoxyquinolinoato)alumin-um(III)-~-oxo-bis(2-methyl-4-methoxyquinolinolato)-aluminum(III) / ~ 0 _ 0 /
- AI-~-AI -CH30 ~ ,N ~N~ / OCH3 c "3 2 ~"3 2 2~8~446 BA-5 Bis(5-cyano-2-methyl-8-quinolinol-ato)aluminum(III)-~.-oxo-bis(5-cyano-2-methyl-8-quinolinolato)aluminum(III) NC ~ ~ 0 _ 0 ~ ~ CN

,N ~N~
cH3 2 cH3 2 BA-6 Bis(2-methyl-5-trifluoromethyl-8-quinol-inolato)aluminum(III)-~-oxo-bis(2-methyl-5-trifluoro-methylquinolinolato)aluminum(III) 0 _ 0 ,N ~'N~

The luminescent layer in one set of sub-pixels can consist of any one or combination of the blue emitting compounds of formulae VIII to XII.
Instead of employing the blue emitting compounds alone in the luminescent layer they can be employed as a host for a blue emitting fluorescent dye following the teachings of Tang et al U.S. Patent 4,769,292, cited above. Any blue emitting combination of one or more fluorescent dyes and one or more compounds satisfying any of formulae VIII to XII can be employed.

In one preferred form of the invention a blue emitting portion of the organic EL medium contains a formulae VIII to XII compound as a host and at least one blue emitting fluorescent dye containing a perylene or benzopyrene chromophoric unit. These chromophoric units require at least 5 fused carbocyclic aromatic rings and 20 carbon atoms in the aromatic rings.
Additional fused rings do not detract from blue emission can be contained in the chromophoric unit. It is generally preferred to employ chromophoric units that contain from 20 to 40 ring carbon atoms.
The following is a listing of illustrative compounds contemplated for use as blue fluorescent dyes containing a perylene or benzopyrene chromophoric unit:
FD-1 Perylene FD-2 Benzo[b]perylene ~~dJ~~~~

FD-3 Dibenzo[fg,ij]pentaphene >oo FD-4 Benzo[a]pyrene FD-5 Dibenzo[a,e]pyrene FD-6 Dibenzo[b,h]pyrene ozozo ~0~~~~:~

FD-7 Dibenzo[e,l]pyrene FD-8 Dibenzo[a,h]pyrene FD-9 Dibenzo[de,qr]naphthacene O

FD-10 Dibenzo[c,Mn]chrysene o°o° o FD-11 Dibenzo[opq,stu]picene These aromatic ring compounds have the advantage that they can be deposited by vacuum vapor deposition, similarly as the other components of the organic medium. Since the aromatic compounds noted above represent chromophores in and of themselves, it is not necessary that other ring substituents be present.
However, many dyes containing aromatic rings as chromophores are conventional, having been originally prepared for use in solution chemistry and therefore having substituents intended to modify solubility and, in some instances, hue. Various aromatic ring substituents of the types disclosed by Tang et al U.S.
Patent 4,762,292, cited above, are contemplated.
When one of the blue emitting aluminum chelates noted above is employed in forming a blue emitting luminescent layer, higher levels of efficiency are realized when the electron injecting layer employs a metal oxinoid charge accepting compound satisfying the formula:
(XII) ,_____ ~~ ,__ /
M 2+n Z~ M a+n n n where Me represents a metal, n is an integer of from 1 to 3, and Z represents the atoms necessary to complete an oxine nucleus.
Illustrative of useful chelated oxinoid compounds are the following:
CO-1 Aluminum trisoxine CO-2 Magnesium bisoxine CO-3 Bis[benzo{f}-8-quinolinolato] zinc ~t~~~44~

CO-4 Aluminum tris(5-methyloxine) CO-5 Indium trisoxine CO-6 Lithium oxine CO-7 Gallium tris(5-chlorooxine) CO-8 Calcium bis(5-chlorooxine) CO-9 Poly[zinc (II)-bis(8-hydroxy-5-quin-olinyl)methane]
CO-10 Dilithium epindolidione CO-11 Aluminum tris(4-methyloxine) CO-12 Aluminum tris(6-trifluoromethyloxine) Of the various metal oxinoids, the most highly preferred are the tris-chelates of aluminum.
These chelates are formed by reacting three 8-hydroxy-quinoline moieties with a single aluminum atom.
Specifically preferred are aluminum trisoxine [a.k.a., tris(8-quinolinol) aluminum] and aluminum tris(5-methyloxine) [a.k.a. tris(5-methyl-8-quinolinol) aluminum].
As previously noted, the overall thickness of the organic EL medium is in all instances less than 1 ~.m (10,000 .~) and, more typically, less than 5000 ~.
The individual layers of the organic EL medium can exhibit thicknesses as low as 50 ~ while achieving satisfactory performance. It is generally preferred that individual layes ofthe organic EL medium have a thickness in the range of from 100 to 2000 ~ and that the overall thickness ofthe organic EL medium be at least 1000 .~.
Although the second electrode E2 can be formed of any metal or metals (other than an alkali metal) having a lower (<4.0 eV) work function alone or in combination with one or more higher (>4.0 eV) work function metals, it is preferred that the second electrodes be constructed as taught by Tang et al U.S.
Patent 4,885,432. In a specifically preferred construction the second electrodes at their interface ~~~~4~6 with the organic EL medium contain at least 50 percent magnesium and at least 0.1 percent (optimally at least 1 percent) of a metal, such as silver or aluminum, having a work function greater than 4.0 eV. As noted above, after the metal has been deposited that forms an interface with the organic EL medium, the second electrodes can be thickened to increase their conductance without decreasing their electron injecting efficiency by depositing any convenient metal. When a higher (>4.0 eV) metal is employed for this purpose the stability of the second electrodes is also increased.
The red and green emitting fluorescent media can be selected from among conventional organic and inorganic flourescent materials known to absorb blue light and to emit longer wavelength (e.g., green or red) visible light. For example, useful green and red emitting fluorescent media can be selected from among the fluorescent dyes disclosed by Tang et al U.S.
Patent 4,769,292, cited above. However, whereas Tang et al contemplates mixing a fluorescent dye and a host material (corresponding to the material forming the blue emitters other than the carbocyclic aromatic compounds noted above) and therefore requires a specific bandgap and reduction potential relationship between the host and fluorescent dye, in the present arrangement the fluorescent dye and blue emitter are in different layers and are optically coupled so that neither the bandgap nor reduction potential relationships required for energy coupling having any applicability and hence an even broader selection of fluorescent dyes is useful. A wide variety of fluorescent dyes that can be stimulated by blue light to emit in the green or red region of the spectrum are known. It is specifically contemplated to form the fluorescent medium of the same same fluorescent materials employed in luminescent solar concentrators 2~D~~~4~

in which a dye is used to absorb solar photons and flouresce longer wavelength radiation for more efficient light energy collection. J. S. Batchelder, A. H. Zewail and T. Cole, 'Luminescent Solar Concentrators. 2: Experimental and Theoretical Analysis of their Possible Efficiencies', Vol. 20, No. 21, Applied Optics,l Nov. 1981, pp. 3733-3754, reviews the properties of a variety of laser dyes when present in poly(methyl methacrylate) as employed in a luminescent solar concentrator. Laser dyes that emit in the green and red portion of the spectrum are specifically contemplated for use as fluorescent materials in the practice of this invention. Specific examples of laser dyes are set out in Sh~fer Dye Lasers, Chapter 4, Structure and Properties of Laser Dyes' by K. H.
Drexhage, p. 145 et seq., Springer-Verlag, New York, 1977.
A specific example of a red emitting fluorescent dye contemplated for use in the practice of this invention is provided by fluorescent 4-dicyano-methylene-4H-pyrans and 4-dicyanomethylene-4H-thiopyrans, hereinafter referred to as fluorescent dicyanomethylene pyran and thiopyran dyes. Preferred fluorescent dyes of this class are those satisfying the following formula:
(XIII) NCB RCN
C
a X R»
wherein X represents oxygen or sulfur;
R10 represents a 2-(4-aminostyryl) group; and .~~ 20~~4~6 811 represents a second 810 group, an alkyl group, or an aryl group.
Although X most conveniently represents oxygen or sulfur, it is appreciated that higher atomic number chalcogens should provide similar, though bathochromically shifted, response. The amino group can be a primary, secondary or terially amino group.
In one specifically preferred form the amino group can form at least one additional fused ring with the styryl phenyl ring. For example, the styryl phenyl ring and the amino group can form a five or six membered ring fused with the styryl phenyl ring. The alkyl group forming 811 is preferably phenyl. When both 810 and 811 form a 2-(4-aminostyryl) group, the groups can be the same or different, but symmetrical compounds are more conveniently synthesized.
The following are illustrative fluorescent dicyanomethylenepyran and thiopyran dyes:
FD-12 4-(Dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran FD-13 4-(Dicyanomethylene)-2-phenyl-6-[2-(9-julolidyl)ethenyl]-4H-pyran FD-14 4-(Dicyanomethylene)-2,6-di[2-(9-julolidyl)ethenyl]-4H-pyran FD-15 4-(Dicyanomethylene)-2-methyl-6-[2-(9-julolidyl)ethenyl]-4H-pyran FD-16 4-(Dicyanomethylene)-2-methyl-6-[2-(9-julolidyl)ethenyl-4H-thiopyran In one specific illustrative form the green emitting fluorescent medium can contain any of the green emitting polymethine dyes disclosed by Tang et al U.S. Patent 4,769,292, cited above. The polymethine dyes include cyanines, merocyanines, complex cyanines and merocyanines (i.e.. tri-, tetra- and poly-nuclear cyanines and merocyanines), oxonols, hemioxonols, styryls, merostyryls and streptocyanines. Fluorescence 2~8~~~~

in the green and red portions of the spectrum is favored when the methine linkage between nuclei contains three or more methine groups. To reduce internal energy dissipation and thereby enhance flourescence efficiencies it is preferred that the dyes be rigidized. That is, it is preferred that the dyes contain a bridging linkage in addition to the methine chromophoric linkage joining the nuclei of the chromophore. In addition to the illustrations of polymethine dyes provided by Tang et al U.S. Patent 4,769,292, conventional polymethine dye structures are illustrated by Weissberger and Taylor, Special Topics of Heterocyclic Chemistry, John Wiley and Sons, New York, 1977, Chapter VIII; Venkataraman, The Chemistry of Synthetic Dyes, Academic Press, New York, 1971, Chapter V; James, The Theory of the Photographic Process, 4th Ed., Macmillan, 1977, Chapter 8, and F. M.
Hamer, Canine Dyes and Related Compounds, John Wiley and Sons, 1964. Polymethine dyes with lengthened chromophores, typically at least 5 methine groups joining the chromophoric nuclei, are useful red emitting fluorescent dyes.
When the fluorescent medium contains a fluorescent dye, a convenient fabrication technique is to mix the dye with an easily coated and patterned binder, such a photopolymer. Dye concentration and coating thickness can be controlled to provide the desired level of blue light absorption. The fluorescent material can be dissolved in the binder or can be incorporated in particulate form. The latter is most common when inorganic fluorescent materials are employed. It is preferred that the thicknesses of the fluorescent layers be maintained less than about 10 ~tm, since significant light scattering into adjacent pixels can occur as the thickness of the fluorescent medium is increased. For the same reason device constructions 2~~~~~5 are preferred that place the fluorescent media in the closest attainable proximity with the organic EL
medium.
The devices 100 and 200 are full color devices--that is, they emit in each of the blue, green and red portions of the spectrum. It is apparent that the same principles of construction can be employed to construct devices having any desired multicolor emission capability. By simply modifying the choices of the materials employed in the luminescent layer LU
and/or the fluorescent media a variety of different multicolor emission capabilities are possible. It is also specifically contemplated to construct devices that are capable of emitting only two hues. This is accomplished by dividing each pixel into two sub-pixels instead of three as shown. For example, either the sub-pixel Hp or one of the sub-pixels Gp and Rp can be eliminated in each pixel. The electrode elements addressing pixels in the same column is accordingly reduced from three to two. Conversely, it is possible to increase the number of sub-pixels making up each pixel to four, five, six or even more, although the preferred practice is to employ the minimum number of pixels required to obtain a full color imaging capability.
The invention has been described in terms of preferred embodiments in which the second electrodes are formed in their desired pattern and therefore require no subsequent etching or material removal steps for patterning. Although not preferred, it is recognized that the material forming the second electrodes can be uniformly deposited over the organic EL medium and then patterned by conventional masking and etching techniques. When this approach is taken, the walls 107 and 207 can be omitted, since the sole 2~~~~.~~~

function of these walls is to pattern the second electrodes.
In addition, it is possible to pattern the organic EL medium so that different emission hues can be obtained from different sub-pixel areas. For example, if the luminescent layer LU is formed of an efficient green emitter, such as aluminum trisoxine or aluminum tris(5-methyloxine), in sub-pixel GD areas, the G fluorescent medium can be eliminated. The organic EL medium in this modification emits blue light in Bp and Rp sub-pixel areas and green light in GD sub-pixel areas. This arrangement reduces some of the patterning required of the organic EL medium, but has the disadvantage that some patterning is still required. This example does, however, demonstrate that the constructions satisfying the requirements of this invention can be hybridized or combined with conventional construction approaches that require patterning of the organic EL medium.
In still another variation of the invention it is contemplated to employ a filter array in combination with the devices of this invention wherein the filter array includes filter domains corresponding to the sub-pixels of the organic EL image display device. Unlike conventional color filter arrays previously described the function of the filter array is not to filter out two thirds of the light it receives. Rather, the function of the individual filter domains is merely to "trim" away trailing edge emissions. For example, if blue emission having a peak wavelength of less than 480 nm is employed, it is still possible for some emission to occur in the green even to extend into the red region of the spectrum.
Intercepting the longer wavelengths emitted with a filter domain can reduce total emission by only a small fraction (e.g., less than 10~) and yet have a 208~44~

significant impact on improving hue for full color imaging. In a like manner filter domains can trim green and red emissions to the green and red regions of the spectrum, respectively. For the overwhelming majority of applications emissions from the blue, green and red sub-pixels are satisfactory for full color imaging without any further trimming of the emission profiles.
The invention has been described in detail with particular reference to preferred embodiments thereof, but it will be understood that variations and modifications can be effected within the spirit and scope of the invention.

Claims (11)

1. A light emitting device comprised of an image display array consisting of a plurality of light emitting pixels arranged in two intersecting sets of parallel files, the pixels in a first set of parallel files forming columns and the pixels in a second set of parallel files forming rows, each pixel in a file of one set of parallel files containing and being joined by a common light transmissive first electrode means.
the first electrode means in adjacent files of the one set being laterally spaced, an organic electroluminescent medium overlying the first electrode means, each pixel in a file of a remaining set of parallel files containing and being joined by a common second electrode means located on the organic electroluminescent medium, and the second electrode means in adjacent files of the remaining set being laterally spaced on the organic electroluminescent medium, CHARACTERIZED IN THAT the light emitting device is capable of multicolor image display.
the organic electroluminescent medium emits in the blue region of the spectrum and has a peak emission at a wavelength of less than 480 nm, each pixel is divided into at least two sub-pixels, in each file of pixels of a selected set one of said first and second electrode means is divided into at least two laterally spaced elements, each of the electrode elements joining and forming a part of one sub-pixel of each pixel in a same file, and a fluorescent medium capable of absorbing light emitted by the organic electroluminescent medium and emitting at a longer wavelength is positioned to receive emitted light transmitted from the organic electroluminescent medium through the first electrode means, the fluorescent medium being confined to only one of the sub-pixels of each pixel.
2. A light emitting device according to claim 1 further characterized in that a set of parallel walls interposed between the first electrode means and the organic electroluminescent medium, the walls being laterally located at boundaries separating adjacent portions of the second electrode means.
3, A light emitting device according to claim 2 further characterized in that the first electrode means are arranged in parallel rows, each first electrode means joins and forms a part of all sub-pixels in the same row, the second electrode means are arranged in parallel columns, each second electrode means is divided into at least two laterally spaced elements, one element of each second electrode means joins and forms apart of one sub-pixel of each pixel in the same column, a second element of each second electrode means joins and forms a part of a second sub-pixel of each pixel in the same column, and the walls are located at the shared boundaries of sub-pixel columns.
4. A light emitting device according to claim 2 further characterized in that the second electrode means are arranged in parallel rows, each second electrode means joins and forms a part of all sub-pixels in the same row, the first electrode means are arranged in parallel columns, each first electrode means is divided into at least two laterally spaced elements, one element of each first electrode means joins and forms a part of one sub-pixel of each pixel in the same column, a second element of each first electrode means joins and forms a part of a second sub-pixel of each pixel in the same column, and the walls are located at the shared boundaries of pixel rows.
5. A light emitting device according to claim 1 further characterized in that the device has a full color imaging capability, each of the pixels being divided into three sub-pixels, one fluorescent medium capable of absorbing light emitted by the electroluminescent medium and emitting green light is positioned to receive light from the organic electroluminescent medium transmitted through the first electrode means and is confined to one set of sub-pixels, and a second fluorescent medium capable of absorbing light emitted by the electroluminescent medium and emitting red light is positioned to receive light from the organic electroluminescent medium transmitted through the first electrode means and is confined to another set of sub-pixels.
6. A light emitting device having full color capability according to claim 5 further characterized in that the blue emitting luminescent portion is comprised of an aluminum chelate having two 8-quinolinolato ligands and a phenolato ligand or a bis(8-quinolinolato)aluminum-µ-oxo-bis(8-quinolino-lato)aluminum(III) chelate.
7. A light emitting device comprised of an image display array consisting of a plurality of light emitting pixels arranged in two intersecting sets of parallel files, the pixels in a first set of parallel files forming columns and the pixels in a second set of parallel files forming rows, each pixel in a file of one set of parallel files containing and being joined by a common light transmissive first electrode means, the first electrode means in adjacent files of the one set being laterally spaced, an organic electroluminescent medium overlying the first electrode means, each pixel in a file of a remaining set of parallel files containing and being joined by a common second electrode means located on the organic electroluminescent medium, and the second electrode means in adjacent files of the remaining set being laterally spaced on the organic electroluminescent medium.
CHARACTERIZED IN THAT the light emitting device is capable of full color image display, the organic electroluminescent medium emits in the blue region of the spectrum and has a peak emission at a wavelength of less than 480 nm, each pixel is divided into three sub-pixels, in each file of pixels of a selected set one of said first and second electrode means is divided into three laterally spaced elements, each of the electrode elements joining and forming a part of one sub-pixel of each pixel in a same file, one fluorescent medium capable of absorbing light emitted by the electroluminescent medium and emitting green light is positioned to receive light from the organic electroluminescent medium transmitted through the first electrode means and is confined to one set of sub-pixels, a second fluorescent medium capable of absorbing light emitted by the electroluminescent medium and emitting red light is positioned to receive light from the organic electroluminescent medium transmitted through the first electrode means and is confined to another set of sub-pixels, and a set of parallel walls interposed between the first electrode means and the organic electrolumin-escent medium, the walls being laterally located at the boundaries separating adjacent portions of the second electrode means.
8. A light emitting device according to claim 7 further characterized in that the first electrode means are arranged in parallel rows, each first electrode means joins and forms a part of all sub-pixels in the same row, the second electrode means are arranged in parallel columns, each second electrode means is divided into at least three laterally spaced elements, one element of each second electrode means joins and forms a part of one sub-pixel of each pixel in the same column, a second element of each second electrode means joins and forms a part of a second sub-pixel of each pixel in the same column, a third element of each second electrode means joins and forms a part of a third sub-pixel of each pixel in the same column, and the walls are located at the shared boundaries of sub-pixel columns.
9. A light emitting device according to claim 7 further characterized in that the second electrode means are arranged in parallel rows, each second electrode means joins and forms a part of all sub-pixels in the same row, the first electrode means are arranged in parallel columns, each first electrode means is divided into at least three laterally spaced elements, one element of each first electrode means joins and forms a part of one sub-pixel of each pixel in the same column, a second element of each first electrode means joins and forms a part of a second sub-pixel of each pixel in the same column, a third element of each first electrode means joins and forms a part of a third sub-pixel of each pixel in the same column, and the walls are located at the shared boundaries of pixel rows.
10. A light emitting device according to claim 7 further characterized in that the organic electroluminescent medium is comprised of an aluminum chelate having two 8-quinolinolato ligands and a phenolato ligand or a bis(8-quinolinolato)aluminum-µ-oxo-bis(8-quinolinolato)aluminum(III) chelate.
11. A light emitting device 10 further characterized in that the organic electroluminescent medium contains an electron injecting layer containing an aluminum trisoxine in contact with the second electrode means.
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Families Citing this family (375)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6492966B1 (en) * 1982-09-17 2002-12-10 Alton O. Christensen Integrally fabricated gated pixel elements and control circuitry for flat-panel displays
JP3445315B2 (en) * 1992-07-13 2003-09-08 イーストマン コダック カンパニー Aluminum chelate compound and internal junction type organic electroluminescent device
JP2797883B2 (en) * 1993-03-18 1998-09-17 株式会社日立製作所 Multicolor light emitting device and its substrate
FR2702870B1 (en) * 1993-03-19 1995-04-21 Thomson Csf Electroluminescent screen.
US6136540A (en) * 1994-10-03 2000-10-24 Ikonisys Inc. Automated fluorescence in situ hybridization detection of genetic abnormalities
US5491384A (en) * 1994-08-30 1996-02-13 Dyna Image Corporation Light source for a contact image sensor
JP2885093B2 (en) * 1994-10-17 1999-04-19 日本電気株式会社 Image display method
JP2896980B2 (en) * 1994-10-27 1999-05-31 セイコープレシジョン株式会社 EL display device and luminescent dial using this EL display device
JPH08129360A (en) 1994-10-31 1996-05-21 Tdk Corp Electroluminescence display device
US5486406A (en) * 1994-11-07 1996-01-23 Motorola Green-emitting organometallic complexes for use in light emitting devices
US5703436A (en) * 1994-12-13 1997-12-30 The Trustees Of Princeton University Transparent contacts for organic devices
US6358631B1 (en) 1994-12-13 2002-03-19 The Trustees Of Princeton University Mixed vapor deposited films for electroluminescent devices
US6548956B2 (en) 1994-12-13 2003-04-15 The Trustees Of Princeton University Transparent contacts for organic devices
US5707745A (en) 1994-12-13 1998-01-13 The Trustees Of Princeton University Multicolor organic light emitting devices
US5550066A (en) * 1994-12-14 1996-08-27 Eastman Kodak Company Method of fabricating a TFT-EL pixel
US5684365A (en) * 1994-12-14 1997-11-04 Eastman Kodak Company TFT-el display panel using organic electroluminescent media
US5652930A (en) * 1994-12-16 1997-07-29 Eastman Kodak Company Camera information display
US5693428A (en) * 1995-02-06 1997-12-02 Sanyo Electric Co., Ltd. Organic electroluminescent device
DE69623443T2 (en) * 1995-02-06 2003-01-23 Idemitsu Kosan Co VARIOUS COLORED LIGHT EMISSION DEVICE AND METHOD FOR PRODUCING THE SAME
US5598058A (en) * 1995-02-09 1997-01-28 Leading Edge Industries, Inc. Multi-color electroluminescent display
US5693962A (en) * 1995-03-22 1997-12-02 Motorola Full color organic light emitting diode array
US5640067A (en) * 1995-03-24 1997-06-17 Tdk Corporation Thin film transistor, organic electroluminescence display device and manufacturing method of the same
US6853083B1 (en) * 1995-03-24 2005-02-08 Semiconductor Energy Laboratory Co., Ltd. Thin film transfer, organic electroluminescence display device and manufacturing method of the same
US5641611A (en) * 1995-08-21 1997-06-24 Motorola Method of fabricating organic LED matrices
US6091194A (en) * 1995-11-22 2000-07-18 Motorola, Inc. Active matrix display
AU2990097A (en) * 1996-01-11 1997-08-20 Trustees Of Princeton University, The Organic luminescent coating for light detectors
JP4477150B2 (en) * 1996-01-17 2010-06-09 三星モバイルディスプレイ株式會社 Organic thin film EL device
US6157356A (en) * 1996-04-12 2000-12-05 International Business Machines Company Digitally driven gray scale operation of active matrix OLED displays
JP3537591B2 (en) * 1996-04-26 2004-06-14 パイオニア株式会社 Manufacturing method of organic EL display
GB9609282D0 (en) * 1996-05-03 1996-07-10 Cambridge Display Tech Ltd Protective thin oxide layer
GB2331181A (en) * 1996-05-03 1999-05-12 Cambridge Display Tech Ltd Organic light-emitting device and method of fabricating the same
NZ332736A (en) * 1996-05-15 1999-09-29 Chemipro Kasei Kaisha Ltd Multicolor organic el element comprising organic dyes modified so they are capable of changing colours of light emitted from the element
JP3725169B2 (en) 1996-05-15 2005-12-07 セイコーエプソン株式会社 Method for manufacturing thin film device having coating film
WO1997046054A1 (en) * 1996-05-29 1997-12-04 Idemitsu Kosan Co., Ltd. Organic el device
AU3715997A (en) 1996-06-12 1998-01-07 Trustees Of Princeton University, The Plasma treatment of conductive layers
US6048630A (en) * 1996-07-02 2000-04-11 The Trustees Of Princeton University Red-emitting organic light emitting devices (OLED's)
US5902688A (en) * 1996-07-16 1999-05-11 Hewlett-Packard Company Electroluminescent display device
US5705285A (en) * 1996-09-03 1998-01-06 Motorola, Inc. Multicolored organic electroluminescent display
US5773931A (en) * 1996-09-06 1998-06-30 Motorola, Inc. Organic electroluminescent device and method of making same
CN1882206A (en) 1996-09-19 2006-12-20 精工爱普生株式会社 Matrix type display device and manufacturing method of a matrix type display device
WO1998013725A1 (en) * 1996-09-24 1998-04-02 Seiko Epson Corporation Projection display having light source
JPH10104663A (en) 1996-09-27 1998-04-24 Semiconductor Energy Lab Co Ltd Electrooptic device and its formation
US5977704A (en) * 1996-10-28 1999-11-02 Motorola, Inc. Organic electroluminescent display with icons
JP3899566B2 (en) * 1996-11-25 2007-03-28 セイコーエプソン株式会社 Manufacturing method of organic EL display device
EP0845812B1 (en) * 1996-11-28 2009-10-28 Casio Computer Co., Ltd. Display apparatus
US5949188A (en) * 1996-12-18 1999-09-07 Hage Gmbh & Co. Kg Electroluminescent display device with continuous base electrode
US6117529A (en) * 1996-12-18 2000-09-12 Gunther Leising Organic electroluminescence devices and displays
JP3297619B2 (en) * 1996-12-18 2002-07-02 ティーディーケイ株式会社 Organic EL color display
US5834893A (en) * 1996-12-23 1998-11-10 The Trustees Of Princeton University High efficiency organic light emitting devices with light directing structures
US5874803A (en) * 1997-09-09 1999-02-23 The Trustees Of Princeton University Light emitting device with stack of OLEDS and phosphor downconverter
KR100513439B1 (en) * 1996-12-23 2005-09-08 더 트러스티즈 오브 프린스턴 유니버시티 Light emitting articles with light reflecting structures
US6045930A (en) * 1996-12-23 2000-04-04 The Trustees Of Princeton University Materials for multicolor light emitting diodes
US6125226A (en) * 1997-04-18 2000-09-26 The Trustees Of Princeton University Light emitting devices having high brightness
US6091195A (en) * 1997-02-03 2000-07-18 The Trustees Of Princeton University Displays having mesa pixel configuration
US6013982A (en) * 1996-12-23 2000-01-11 The Trustees Of Princeton University Multicolor display devices
US6046543A (en) * 1996-12-23 2000-04-04 The Trustees Of Princeton University High reliability, high efficiency, integratable organic light emitting devices and methods of producing same
US5904961A (en) * 1997-01-24 1999-05-18 Eastman Kodak Company Method of depositing organic layers in organic light emitting devices
US5869929A (en) * 1997-02-04 1999-02-09 Idemitsu Kosan Co., Ltd. Multicolor luminescent device
JP2848371B2 (en) 1997-02-21 1999-01-20 日本電気株式会社 Organic EL display device and manufacturing method thereof
JP3224352B2 (en) * 1997-02-21 2001-10-29 出光興産株式会社 Multicolor light emitting device
KR100209657B1 (en) * 1997-04-24 1999-07-15 구자홍 Multi color electroluminescence display panel and manufaturing method
US6111902A (en) 1997-05-09 2000-08-29 The Trustees Of Princeton University Organic semiconductor laser
US5932895A (en) * 1997-05-20 1999-08-03 The Trustees Of Princeton University Saturated full color stacked organic light emitting devices
US6175345B1 (en) 1997-06-02 2001-01-16 Canon Kabushiki Kaisha Electroluminescence device, electroluminescence apparatus, and production methods thereof
US5937272A (en) * 1997-06-06 1999-08-10 Eastman Kodak Company Patterned organic layers in a full-color organic electroluminescent display array on a thin film transistor array substrate
GB9713074D0 (en) * 1997-06-21 1997-08-27 Cambridge Display Tech Ltd Electrically-conducting colour filters for use in organic light-emitting displays
KR20010021742A (en) * 1997-07-11 2001-03-15 게리 더블유. 존스 Laser ablation method to fabricate color organic light emitting diode displays
US6023259A (en) * 1997-07-11 2000-02-08 Fed Corporation OLED active matrix using a single transistor current mode pixel design
US5977718A (en) * 1997-08-08 1999-11-02 Christensen; Alton O. Gated pixel elements using polymer electroluminescent materials for panel displays
JP3633229B2 (en) * 1997-09-01 2005-03-30 セイコーエプソン株式会社 LIGHT EMITTING DEVICE MANUFACTURING METHOD AND MULTICOLOR DISPLAY DEVICE MANUFACTURING METHOD
US6278237B1 (en) 1997-09-22 2001-08-21 Emagin Corporation Laterally structured high resolution multicolor organic electroluminescence display device
US6303238B1 (en) * 1997-12-01 2001-10-16 The Trustees Of Princeton University OLEDs doped with phosphorescent compounds
US6451455B1 (en) 1998-04-01 2002-09-17 The Trustees Of Princeton University Metal complexes bearing both electron transporting and hole transporting moieties
US6420031B1 (en) 1997-11-03 2002-07-16 The Trustees Of Princeton University Highly transparent non-metallic cathodes
EP1656002A3 (en) 1997-10-09 2012-06-20 The Trustees Of Princeton University Organic light emitting device
JP2914361B2 (en) * 1997-10-09 1999-06-28 日本電気株式会社 Organic thin film EL device
US6469437B1 (en) 1997-11-03 2002-10-22 The Trustees Of Princeton University Highly transparent organic light emitting device employing a non-metallic cathode
US6150043A (en) 1998-04-10 2000-11-21 The Trustees Of Princeton University OLEDs containing thermally stable glassy organic hole transporting materials
JPH11138899A (en) 1997-11-11 1999-05-25 Canon Inc Image forming system
GB9724682D0 (en) 1997-11-21 1998-01-21 Cambridge Display Tech Ltd Electroluminescent device
US5953587A (en) 1997-11-24 1999-09-14 The Trustees Of Princeton University Method for deposition and patterning of organic thin film
US6013538A (en) * 1997-11-24 2000-01-11 The Trustees Of Princeton University Method of fabricating and patterning OLEDs
US6307528B1 (en) * 1997-12-08 2001-10-23 Hughes Electronics Corporation Contrast organic light-emitting display
JP3039778B2 (en) 1998-01-05 2000-05-08 キヤノン株式会社 Image forming device
JP2942230B2 (en) * 1998-01-12 1999-08-30 キヤノン株式会社 Image forming apparatus and light emitting device
US6252254B1 (en) 1998-02-06 2001-06-26 General Electric Company Light emitting device with phosphor composition
US6005344A (en) * 1998-02-18 1999-12-21 Eastman Kodak Company Organic electroluminescent image display panel with multiple barriers
US6008578A (en) * 1998-02-20 1999-12-28 Chen; Hsing Full-color organic electroluminescent device with spaced apart fluorescent areas
JPH11273859A (en) * 1998-03-24 1999-10-08 Sony Corp Organic electroluminescent element and its manufacture
US6084347A (en) * 1998-03-27 2000-07-04 Motorola, Inc. Multicolored organic electroluminescent display
US6387544B1 (en) 1998-04-10 2002-05-14 The Trustees Of Princeton University OLEDS containing thermally stable glassy organic hole transporting materials
US6120857A (en) * 1998-05-18 2000-09-19 The Regents Of The University Of California Low work function surface layers produced by laser ablation using short-wavelength photons
JP4053136B2 (en) * 1998-06-17 2008-02-27 株式会社半導体エネルギー研究所 Reflective semiconductor display device
JP2000036201A (en) * 1998-07-06 2000-02-02 Fukukoku Ko Light emission method and light emission device generating different visible electromagnetic wave length by exciting electron in covering layer molecules
US6140764A (en) * 1998-07-20 2000-10-31 Motorola, Inc. Organic electroluminescent apparatus with mircrocavity
CN100340136C (en) * 1998-09-02 2007-09-26 精工爱普生株式会社 Light source and display device
US6563263B1 (en) * 1998-09-07 2003-05-13 Fuji Electric Co., Ltd. Multi-colored organic EL device with protective layer
US6097147A (en) * 1998-09-14 2000-08-01 The Trustees Of Princeton University Structure for high efficiency electroluminescent device
US6830828B2 (en) 1998-09-14 2004-12-14 The Trustees Of Princeton University Organometallic complexes as phosphorescent emitters in organic LEDs
US6166489A (en) * 1998-09-15 2000-12-26 The Trustees Of Princeton University Light emitting device using dual light emitting stacks to achieve full-color emission
EP1042775A2 (en) 1998-09-22 2000-10-11 Fed Corporation Inorganic-based color conversion matrix element for organic color display devices and method of fabrication
US6428912B1 (en) * 1998-09-30 2002-08-06 Agere Systems Guardian Corp. Electron transport material and light emitting diode that contains the electron transport material
JP2000133452A (en) 1998-10-28 2000-05-12 Matsushita Electric Ind Co Ltd Distributed multicolor luminescent el lamp and el lamp unit the same
JP2000137268A (en) * 1998-10-30 2000-05-16 Olympus Optical Co Ltd Display device in finder of camera
US6504299B1 (en) * 1998-11-06 2003-01-07 Rohm Co., Ltd. Minuscule light-emitting device and organic EL device using the same
US6384529B2 (en) 1998-11-18 2002-05-07 Eastman Kodak Company Full color active matrix organic electroluminescent display panel having an integrated shadow mask
JP2000212554A (en) 1998-11-20 2000-08-02 Idemitsu Kosan Co Ltd Fluorescence conversion medium and display device using the same
US6066357A (en) * 1998-12-21 2000-05-23 Eastman Kodak Company Methods of making a full-color organic light-emitting display
US6873098B2 (en) * 1998-12-22 2005-03-29 Alton O. Christensen, Sr. Electroluminescent devices and displays with integrally fabricated address and logic devices fabricated by printing or weaving
US6656608B1 (en) 1998-12-25 2003-12-02 Konica Corporation Electroluminescent material, electroluminescent element and color conversion filter
JP3594826B2 (en) 1999-02-09 2004-12-02 パイオニア株式会社 Nitride semiconductor light emitting device and method of manufacturing the same
JP3641963B2 (en) * 1999-02-15 2005-04-27 双葉電子工業株式会社 Organic EL device and manufacturing method thereof
US7001536B2 (en) * 1999-03-23 2006-02-21 The Trustees Of Princeton University Organometallic complexes as phosphorescent emitters in organic LEDs
TW463528B (en) * 1999-04-05 2001-11-11 Idemitsu Kosan Co Organic electroluminescence element and their preparation
US6512504B1 (en) 1999-04-27 2003-01-28 Semiconductor Energy Laborayory Co., Ltd. Electronic device and electronic apparatus
US6262710B1 (en) * 1999-05-25 2001-07-17 Intel Corporation Performing color conversion in extended color polymer displays
WO2000069625A1 (en) * 1999-05-13 2000-11-23 The University Of Southern California Titanium nitride anode for use in organic light emitting devices
US7091605B2 (en) * 2001-09-21 2006-08-15 Eastman Kodak Company Highly moisture-sensitive electronic device element and method for fabrication
TWI232595B (en) * 1999-06-04 2005-05-11 Semiconductor Energy Lab Electroluminescence display device and electronic device
US8853696B1 (en) 1999-06-04 2014-10-07 Semiconductor Energy Laboratory Co., Ltd. Electro-optical device and electronic device
US7288420B1 (en) * 1999-06-04 2007-10-30 Semiconductor Energy Laboratory Co., Ltd. Method for manufacturing an electro-optical device
JP2000356972A (en) 1999-06-15 2000-12-26 Pioneer Electronic Corp Device and method for driving light emitting panel
TW483287B (en) * 1999-06-21 2002-04-11 Semiconductor Energy Lab EL display device, driving method thereof, and electronic equipment provided with the EL display device
JP4627822B2 (en) 1999-06-23 2011-02-09 株式会社半導体エネルギー研究所 Display device
TW543206B (en) * 1999-06-28 2003-07-21 Semiconductor Energy Lab EL display device and electronic device
US6221563B1 (en) 1999-08-12 2001-04-24 Eastman Kodak Company Method of making an organic electroluminescent device
JP2001144331A (en) * 1999-09-02 2001-05-25 Toyoda Gosei Co Ltd Light-emitting device
JP3463866B2 (en) * 1999-09-24 2003-11-05 富士電機株式会社 Fluorescent color conversion film, fluorescent color conversion filter using the same, and organic light emitting device including the fluorescent color conversion filter
TW480722B (en) 1999-10-12 2002-03-21 Semiconductor Energy Lab Manufacturing method of electro-optical device
GB9924515D0 (en) * 1999-10-15 1999-12-15 Cambridge Display Tech Ltd Light-emitting devices
TW535454B (en) 1999-10-21 2003-06-01 Semiconductor Energy Lab Electro-optical device
US6587086B1 (en) 1999-10-26 2003-07-01 Semiconductor Energy Laboratory Co., Ltd. Electro-optical device
JP4727029B2 (en) 1999-11-29 2011-07-20 株式会社半導体エネルギー研究所 EL display device, electric appliance, and semiconductor element substrate for EL display device
TW587239B (en) 1999-11-30 2004-05-11 Semiconductor Energy Lab Electric device
US7576496B2 (en) * 1999-12-22 2009-08-18 General Electric Company AC powered OLED device
US6566808B1 (en) * 1999-12-22 2003-05-20 General Electric Company Luminescent display and method of making
JP4255610B2 (en) * 1999-12-28 2009-04-15 出光興産株式会社 White organic electroluminescence device
KR100721656B1 (en) * 2005-11-01 2007-05-23 주식회사 엘지화학 Organic electronic devices
TWM244584U (en) 2000-01-17 2004-09-21 Semiconductor Energy Lab Display system and electrical appliance
US6515417B1 (en) 2000-01-27 2003-02-04 General Electric Company Organic light emitting device and method for mounting
US6700322B1 (en) 2000-01-27 2004-03-02 General Electric Company Light source with organic layer and photoluminescent layer
US6661029B1 (en) * 2000-03-31 2003-12-09 General Electric Company Color tunable organic electroluminescent light source
US6777871B2 (en) 2000-03-31 2004-08-17 General Electric Company Organic electroluminescent devices with enhanced light extraction
DE10018168A1 (en) * 2000-04-12 2001-10-25 Osram Opto Semiconductors Gmbh Method of manufacturing organic light emitting diodes
AU2001253472A1 (en) * 2000-04-14 2001-10-30 Emagin Corporation Improved method of fabrication and extraction of light from color changing medium layers in organic light emitting devices
TW493282B (en) * 2000-04-17 2002-07-01 Semiconductor Energy Lab Self-luminous device and electric machine using the same
US6847341B2 (en) * 2000-04-19 2005-01-25 Semiconductor Energy Laboratory Co., Ltd. Electronic device and method of driving the same
EP1150165A1 (en) 2000-04-25 2001-10-31 JSR Corporation Radiation sensitive resin composition for forming barrier ribs for an el display element, barrier ribs and el display element
US6611108B2 (en) * 2000-04-26 2003-08-26 Semiconductor Energy Laboratory Co., Ltd. Electronic device and driving method thereof
US7517551B2 (en) * 2000-05-12 2009-04-14 Semiconductor Energy Laboratory Co., Ltd. Method of manufacturing a light-emitting device
US6995753B2 (en) 2000-06-06 2006-02-07 Semiconductor Energy Laboratory Co., Ltd. Display device and method of manufacturing the same
JP2002072963A (en) * 2000-06-12 2002-03-12 Semiconductor Energy Lab Co Ltd Light-emitting module and driving method therefor, and optical sensor
TW522454B (en) * 2000-06-22 2003-03-01 Semiconductor Energy Lab Display device
US6528824B2 (en) 2000-06-29 2003-03-04 Semiconductor Energy Laboratory Co., Ltd. Light emitting device
GB0016660D0 (en) * 2000-07-06 2000-08-23 Cambridge Display Tech Ltd Method of producing an organic light-emitting device
US6733904B2 (en) 2000-07-17 2004-05-11 National Research Council Of Canada Use of oligo(phenylenevinylene)s in organic light-emitting devices
US6879110B2 (en) * 2000-07-27 2005-04-12 Semiconductor Energy Laboratory Co., Ltd. Method of driving display device
US6956324B2 (en) * 2000-08-04 2005-10-18 Semiconductor Energy Laboratory Co., Ltd. Semiconductor device and manufacturing method therefor
US6605826B2 (en) * 2000-08-18 2003-08-12 Semiconductor Energy Laboratory Co., Ltd. Light-emitting device and display device
US6822629B2 (en) * 2000-08-18 2004-11-23 Semiconductor Energy Laboratory Co., Ltd. Light emitting device
US6739931B2 (en) * 2000-09-18 2004-05-25 Semiconductor Energy Laboratory Co., Ltd. Display device and method of fabricating the display device
US6348359B1 (en) * 2000-09-22 2002-02-19 Eastman Kodak Company Cathode contact structures in organic electroluminescent devices
US6884093B2 (en) * 2000-10-03 2005-04-26 The Trustees Of Princeton University Organic triodes with novel grid structures and method of production
JP3902938B2 (en) * 2000-10-31 2007-04-11 キヤノン株式会社 Organic light emitting device manufacturing method, organic light emitting display manufacturing method, organic light emitting device, and organic light emitting display
US6515314B1 (en) 2000-11-16 2003-02-04 General Electric Company Light-emitting device with organic layer doped with photoluminescent material
US7221088B2 (en) 2000-11-29 2007-05-22 The United States Of America As Represented By The Secretary Of The Navy Universal host for RG or RGB emission in organic light emitting devices
US6781309B2 (en) 2000-11-29 2004-08-24 Cld, Inc. Plasma switched organic electroluminescent display
US6803720B2 (en) * 2000-12-15 2004-10-12 Universal Display Corporation Highly stable and efficient OLEDs with a phosphorescent-doped mixed layer architecture
US6703780B2 (en) * 2001-01-16 2004-03-09 General Electric Company Organic electroluminescent device with a ceramic output coupler and method of making the same
GB2371910A (en) * 2001-01-31 2002-08-07 Seiko Epson Corp Display devices
US6627111B2 (en) 2001-03-06 2003-09-30 International Business Machines Corp. Organic light emitting displays and new fluorescent compounds
US6596443B2 (en) 2001-03-12 2003-07-22 Universal Display Corporation Mask for patterning devices
US6407408B1 (en) 2001-03-12 2002-06-18 Universal Display Corporation Method for patterning devices
US6610554B2 (en) 2001-04-18 2003-08-26 Hyung Se Kim Method of fabricating organic electroluminescent display
JP2002358031A (en) 2001-06-01 2002-12-13 Semiconductor Energy Lab Co Ltd Light emitting device and its driving method
US7294517B2 (en) * 2001-06-18 2007-11-13 Semiconductor Energy Laboratory Co., Ltd. Light emitting device and method of fabricating the same
US6791258B2 (en) * 2001-06-21 2004-09-14 3M Innovative Properties Company Organic light emitting full color display panel
WO2003001569A2 (en) 2001-06-21 2003-01-03 The Trustees Of Princeton University Organic light-emitting devices with blocking and transport layers
US6664730B2 (en) 2001-07-09 2003-12-16 Universal Display Corporation Electrode structure of el device
JP2003045673A (en) * 2001-07-26 2003-02-14 Victor Co Of Japan Ltd Organic electroluminescent element
KR100441434B1 (en) * 2001-08-01 2004-07-22 삼성에스디아이 주식회사 An organic electroluminescent display device comprising an organic compound and Method for preparing thereof
KR100401378B1 (en) * 2001-08-09 2003-10-17 엘지.필립스 엘시디 주식회사 The organic electroluminescence device
US6949878B2 (en) * 2001-08-28 2005-09-27 Konica Corporation Multicolor light emission apparatus with multiple different wavelength organic elements
EP2555274B1 (en) 2001-08-29 2020-06-24 The Trustees of Princeton University Organic light emitting devices having carrier blocking layers comprising metal complexes
US7078113B2 (en) * 2001-08-29 2006-07-18 The University Of Southern California Organic light emitting devices having carrier transporting layers comprising metal complexes
EP1422976B1 (en) * 2001-08-30 2013-10-09 Sharp Kabushiki Kaisha Method for manufacturing organic el device and organic el device
US6806642B2 (en) * 2001-09-04 2004-10-19 Durel Corporation Light source with cascading dyes and BEF
US6689494B1 (en) 2001-09-11 2004-02-10 Bhalchandra M. Karandikar Light emissive materials for organic light emitting devices (OLED) and OLED based thereupon
DE10145492B4 (en) * 2001-09-14 2004-11-11 Novaled Gmbh Electroluminescent light emission device, in particular as a white light source
WO2003026360A1 (en) 2001-09-15 2003-03-27 Cld, Inc. Organic electroluminescence display and fabricating mehtod thereof
JP2003115377A (en) 2001-10-03 2003-04-18 Nec Corp Light emitting element, its manufacturing method, and display equipment using this
US6753096B2 (en) 2001-11-27 2004-06-22 General Electric Company Environmentally-stable organic electroluminescent fibers
SG176316A1 (en) * 2001-12-05 2011-12-29 Semiconductor Energy Lab Organic semiconductor element
US7050835B2 (en) 2001-12-12 2006-05-23 Universal Display Corporation Intelligent multi-media display communication system
US6903505B2 (en) 2001-12-17 2005-06-07 General Electric Company Light-emitting device with organic electroluminescent material and photoluminescent materials
KR100834342B1 (en) * 2001-12-29 2008-06-02 엘지디스플레이 주식회사 an active matrix organic electroluminescence display and a manufacturing method of the same
US7348946B2 (en) * 2001-12-31 2008-03-25 Intel Corporation Energy sensing light emitting diode display
US6649436B2 (en) 2002-02-11 2003-11-18 Eastman Kodak Company Using organic materials in making an organic light-emitting device
US6872472B2 (en) * 2002-02-15 2005-03-29 Eastman Kodak Company Providing an organic electroluminescent device having stacked electroluminescent units
EP1343206B1 (en) 2002-03-07 2016-10-26 Semiconductor Energy Laboratory Co., Ltd. Light emitting apparatus, electronic apparatus, illuminating device and method of fabricating the light emitting apparatus
EP1357602A1 (en) * 2002-03-19 2003-10-29 Scheuten Glasgroep Self-adjusting series connection of thin films and method of fabrication
KR100426964B1 (en) * 2002-03-20 2004-04-13 엘지.필립스 엘시디 주식회사 Organic Electroluminescent Device and Method for Fabricating the same
US7190335B2 (en) * 2002-03-26 2007-03-13 Semiconductor Energy Laboratory Co., Ltd. Light emitting device and method of manufacturing the same
US6770502B2 (en) * 2002-04-04 2004-08-03 Eastman Kodak Company Method of manufacturing a top-emitting OLED display device with desiccant structures
US20030193796A1 (en) * 2002-04-15 2003-10-16 Heeks Stephen K. Light-emitting devices
TWI314947B (en) * 2002-04-24 2009-09-21 Eastman Kodak Compan Organic light emitting diode devices with improved operational stability
US7264889B2 (en) * 2002-04-24 2007-09-04 Eastman Kodak Company Stable electroluminescent device
GB2388236A (en) 2002-05-01 2003-11-05 Cambridge Display Tech Ltd Display and driver circuits
US6667215B2 (en) * 2002-05-02 2003-12-23 3M Innovative Properties Method of making transistors
KR20030086168A (en) * 2002-05-03 2003-11-07 엘지.필립스 엘시디 주식회사 The organic electro-luminescence device and method for fabricating of the same
EP1367659B1 (en) * 2002-05-21 2012-09-05 Semiconductor Energy Laboratory Co., Ltd. Organic field effect transistor
TW576124B (en) * 2002-05-28 2004-02-11 Ritdisplay Corp Full color organic light-emitting display device
US20040004433A1 (en) * 2002-06-26 2004-01-08 3M Innovative Properties Company Buffer layers for organic electroluminescent devices and methods of manufacture and use
JP2004047387A (en) 2002-07-15 2004-02-12 Fuji Electric Holdings Co Ltd Organic multicolor luminescent display device and its manufacturing method
JP4094919B2 (en) * 2002-07-18 2008-06-04 東北パイオニア株式会社 Organic light emitting display
TW200402012A (en) * 2002-07-23 2004-02-01 Eastman Kodak Co OLED displays with fiber-optic faceplates
KR100473590B1 (en) * 2002-07-25 2005-03-10 엘지.필립스 엘시디 주식회사 The organic electro-luminescence device and method for fabricating of the same
US6890627B2 (en) 2002-08-02 2005-05-10 Eastman Kodak Company Laser thermal transfer from a donor element containing a hole-transporting layer
US6939660B2 (en) * 2002-08-02 2005-09-06 Eastman Kodak Company Laser thermal transfer donor including a separate dopant layer
US7049757B2 (en) 2002-08-05 2006-05-23 General Electric Company Series connected OLED structure and fabrication method
TWI272874B (en) 2002-08-09 2007-02-01 Semiconductor Energy Lab Organic electroluminescent device
US7663300B2 (en) * 2002-08-16 2010-02-16 Universal Display Corporation Organic light emitting devices for illumination
US6747618B2 (en) 2002-08-20 2004-06-08 Eastman Kodak Company Color organic light emitting diode display with improved lifetime
US20040043140A1 (en) * 2002-08-21 2004-03-04 Ramesh Jagannathan Solid state lighting using compressed fluid coatings
US20040043138A1 (en) * 2002-08-21 2004-03-04 Ramesh Jagannathan Solid state lighting using compressed fluid coatings
US20040108509A1 (en) * 2002-09-03 2004-06-10 Caballero Gabriel Joseph Light emitting molecules and organic light emitting devices including light emitting molecules
US20040191567A1 (en) * 2002-09-03 2004-09-30 Caballero Gabriel Joseph Light emitting molecules and organic light emitting devices including light emitting molecules
US20040051444A1 (en) * 2002-09-17 2004-03-18 General Electric Company Articles having raised features and methods for making the same
US6765349B2 (en) * 2002-09-30 2004-07-20 Eastman Kodak Company High work function metal alloy cathode used in organic electroluminescent devices
KR20050072424A (en) * 2002-10-01 2005-07-11 코닌클리케 필립스 일렉트로닉스 엔.브이. Electroluminescent display with improved light outcoupling
US6831407B2 (en) * 2002-10-15 2004-12-14 Eastman Kodak Company Oled device having improved light output
GB0224121D0 (en) * 2002-10-16 2002-11-27 Microemissive Displays Ltd Method of patterning a functional material on to a substrate
KR101082130B1 (en) * 2002-10-18 2011-11-09 이화이어 아이피 코포레이션 Color electroluminescent display
KR100460210B1 (en) * 2002-10-29 2004-12-04 엘지.필립스 엘시디 주식회사 Dual Panel Type Organic Electroluminescent Device and Method for Fabricating the same
US6717176B1 (en) * 2002-11-12 2004-04-06 Opto Tech Corporation White light emitting organic electro-luminescent device and method for fabricating the same
US7597936B2 (en) * 2002-11-26 2009-10-06 University Of Utah Research Foundation Method of producing a pigmented composite microporous material
WO2004048936A2 (en) * 2002-11-26 2004-06-10 University Of Utah Research Foundation Microporous materials, methods, and articles for localizing and quantifying analytes
US7368659B2 (en) * 2002-11-26 2008-05-06 General Electric Company Electrodes mitigating effects of defects in organic electronic devices
US20040108061A1 (en) * 2002-12-06 2004-06-10 Eastman Kodak Company Apparatus and method for making a light-emitting display
US7230594B2 (en) 2002-12-16 2007-06-12 Eastman Kodak Company Color OLED display with improved power efficiency
US7063900B2 (en) 2002-12-23 2006-06-20 General Electric Company White light-emitting organic electroluminescent devices
JP2004207065A (en) 2002-12-25 2004-07-22 Fuji Electric Holdings Co Ltd Color conversion light emitting device, its manufacturing method and display using color conversion light emitting device
KR100484092B1 (en) * 2002-12-26 2005-04-18 엘지.필립스 엘시디 주식회사 Dual Panel Type Electroluminescent Device and Method for Fabricating the same
US7135816B2 (en) 2003-02-20 2006-11-14 Fuji Electric Co., Ltd. Color conversion filter and color conversion color display having the same
US7301273B2 (en) * 2003-02-20 2007-11-27 Barco Nv Display element array for emissive, fixed format display
JP4574127B2 (en) 2003-03-26 2010-11-04 株式会社半導体エネルギー研究所 Element substrate and light emitting device
US6727660B1 (en) 2003-03-27 2004-04-27 General Electric Company Organic electroluminescent devices and method for improving energy efficiency and optical stability thereof
JP3877692B2 (en) * 2003-03-28 2007-02-07 三洋電機株式会社 Organic electroluminescence device and method for manufacturing the same
US7030555B2 (en) 2003-04-04 2006-04-18 Nitto Denko Corporation Organic electroluminescence device, planar light source and display device using the same
US6847162B2 (en) * 2003-04-29 2005-01-25 General Electric Company Light source with organic layer and photoluminescent layer
TW591566B (en) * 2003-06-03 2004-06-11 Ritdisplay Corp Full color display panel and color-separating substrate thereof
US7153539B2 (en) * 2003-06-24 2006-12-26 Eastman Kodak Company Apparatus and method of color tuning a light-emitting display
US20040265622A1 (en) * 2003-06-24 2004-12-30 Eastman Kodak Company Light emitting display
US7511421B2 (en) * 2003-08-25 2009-03-31 Semiconductor Energy Laboratory Co., Ltd. Mixed metal and organic electrode for organic device
DE10353036B4 (en) * 2003-11-13 2021-11-25 Pictiva Displays International Limited Full color organic display with color filter technology and matched white emitter material and uses for it
US7430355B2 (en) * 2003-12-08 2008-09-30 University Of Cincinnati Light emissive signage devices based on lightwave coupling
US7123796B2 (en) * 2003-12-08 2006-10-17 University Of Cincinnati Light emissive display based on lightwave coupling
US7221332B2 (en) * 2003-12-19 2007-05-22 Eastman Kodak Company 3D stereo OLED display
KR100557235B1 (en) * 2003-12-30 2006-03-07 엘지.필립스 엘시디 주식회사 The organic electro-luminescence device and method for fabricating of the same
KR100557236B1 (en) * 2003-12-30 2006-03-07 엘지.필립스 엘시디 주식회사 Dual Panel Type Organic Electroluminescent Device and Method for Fabricating the same
KR20050068860A (en) * 2003-12-30 2005-07-05 엘지.필립스 엘시디 주식회사 Upper substrate for use in dual-plate organic electroluminescent device and method for fabricating the same
US7132796B2 (en) * 2003-12-30 2006-11-07 Lg.Philips Lcd Co., Ltd Organic electroluminescent device and method of fabricating the same
KR100579549B1 (en) * 2003-12-31 2006-05-12 엘지.필립스 엘시디 주식회사 Dual Plate Type Organic Electroluminescent Display Device and method for fabricating the same
US20050164019A1 (en) * 2004-01-22 2005-07-28 General Electric Company Charge transfer-promoting materials and electronic devices incorporating same
JP2005243549A (en) * 2004-02-27 2005-09-08 Sony Corp Display element, display device and image pickup device
US7393598B2 (en) * 2004-03-10 2008-07-01 Hcf Partners, L.P. Light emitting molecules and organic light emitting devices including light emitting molecules
JP4090447B2 (en) * 2004-03-29 2008-05-28 三洋電機株式会社 Organic electroluminescence device
TWI243625B (en) * 2004-05-04 2005-11-11 Toppoly Optoelectronics Corp Organic light-emitting display structure
US20060017055A1 (en) * 2004-07-23 2006-01-26 Eastman Kodak Company Method for manufacturing a display device with low temperature diamond coatings
US7316756B2 (en) 2004-07-27 2008-01-08 Eastman Kodak Company Desiccant for top-emitting OLED
TWI233319B (en) * 2004-08-10 2005-05-21 Ind Tech Res Inst Full-color organic electroluminescence device and display panel using the same
JP4616596B2 (en) * 2004-08-27 2011-01-19 株式会社 日立ディスプレイズ Manufacturing method of electronic device
KR100665941B1 (en) * 2004-09-17 2007-01-09 엘지.필립스 엘시디 주식회사 Organic electro-luminescent device and method for fabricating the same
US9040170B2 (en) * 2004-09-20 2015-05-26 Global Oled Technology Llc Electroluminescent device with quinazoline complex emitter
US7501152B2 (en) 2004-09-21 2009-03-10 Eastman Kodak Company Delivering particulate material to a vaporization zone
KR100656496B1 (en) * 2004-09-21 2006-12-11 삼성에스디아이 주식회사 full color OLED and fabricating method of the same
US8026663B2 (en) * 2004-10-05 2011-09-27 National University Corporation Gunma University Triphenylene compounds, method of manufacturing the same and organic electroluminescent devices employing the same
US20060131565A1 (en) * 2004-12-20 2006-06-22 General Electric Company Surface modified electrodes for electrooptic devices
KR101085130B1 (en) 2004-12-30 2011-11-18 엘지디스플레이 주식회사 Organic Electroluminescence Display Device And Method For Fabricating The Same
US7045375B1 (en) * 2005-01-14 2006-05-16 Au Optronics Corporation White light emitting device and method of making same
JP4939809B2 (en) 2005-01-21 2012-05-30 株式会社半導体エネルギー研究所 Light emitting device
TWI339835B (en) * 2005-02-03 2011-04-01 Chimei Innolux Corp Pixel structure for a color display device, organic light emitting device module, electronic device and method of rendering color of a pixel in a display device
US7142179B2 (en) * 2005-03-23 2006-11-28 Eastman Kodak Company OLED display device
US20080272347A1 (en) * 2005-03-28 2008-11-06 Idemitsu Kosan Co., Ltd. Organic Ligands for Semiconductor Nanocrystals
US8057916B2 (en) * 2005-04-20 2011-11-15 Global Oled Technology, Llc. OLED device with improved performance
US20060240281A1 (en) * 2005-04-21 2006-10-26 Eastman Kodak Company Contaminant-scavenging layer on OLED anodes
US20060273713A1 (en) * 2005-06-02 2006-12-07 Eastman Kodak Company Process for making an organic light-emitting device
US8718437B2 (en) * 2006-03-07 2014-05-06 Qd Vision, Inc. Compositions, optical component, system including an optical component, devices, and other products
WO2007103310A2 (en) * 2006-03-07 2007-09-13 Qd Vision, Inc. An article including semiconductor nanocrystals
US8269227B2 (en) 2005-06-09 2012-09-18 Semiconductor Energy Laboratory Co., Ltd. Light emitting device and electronic device
JP2007019487A (en) * 2005-06-09 2007-01-25 Semiconductor Energy Lab Co Ltd Light emitting device and electronic device
KR101370317B1 (en) * 2005-07-14 2014-03-05 코닌클리케 필립스 엔.브이. Electroluminescent light source
US20070048545A1 (en) * 2005-08-31 2007-03-01 Eastman Kodak Company Electron-transporting layer for white OLED device
JP4432863B2 (en) * 2005-09-05 2010-03-17 セイコーエプソン株式会社 Organic electroluminescence device and electronic device
JP2007095759A (en) 2005-09-27 2007-04-12 Hitachi Displays Ltd Organic el display device
KR100708714B1 (en) 2005-09-30 2007-04-17 삼성에스디아이 주식회사 Organic light emitting display device and manufacturing method thereof
US8956738B2 (en) * 2005-10-26 2015-02-17 Global Oled Technology Llc Organic element for low voltage electroluminescent devices
US20070103056A1 (en) * 2005-11-08 2007-05-10 Eastman Kodak Company OLED device having improved light output
US9666826B2 (en) * 2005-11-30 2017-05-30 Global Oled Technology Llc Electroluminescent device including an anthracene derivative
US20070122657A1 (en) * 2005-11-30 2007-05-31 Eastman Kodak Company Electroluminescent device containing a phenanthroline derivative
JP4441883B2 (en) 2005-12-06 2010-03-31 ソニー株式会社 Display device
KR100845694B1 (en) * 2006-01-18 2008-07-11 주식회사 엘지화학 Oled having stacked organic light-emitting units
US8470208B2 (en) * 2006-01-24 2013-06-25 E I Du Pont De Nemours And Company Organometallic complexes
JP5520479B2 (en) * 2006-02-20 2014-06-11 コニカミノルタ株式会社 ORGANIC ELECTROLUMINESCENT ELEMENT, WHITE LIGHT EMITTING ELEMENT, AND LIGHTING DEVICE
US7791271B2 (en) 2006-02-24 2010-09-07 Global Oled Technology Llc Top-emitting OLED device with light-scattering layer and color-conversion
US20070207345A1 (en) * 2006-03-01 2007-09-06 Eastman Kodak Company Electroluminescent device including gallium complexes
US9951438B2 (en) 2006-03-07 2018-04-24 Samsung Electronics Co., Ltd. Compositions, optical component, system including an optical component, devices, and other products
US9874674B2 (en) 2006-03-07 2018-01-23 Samsung Electronics Co., Ltd. Compositions, optical component, system including an optical component, devices, and other products
US9118020B2 (en) * 2006-04-27 2015-08-25 Global Oled Technology Llc Electroluminescent devices including organic eil layer
WO2007130047A1 (en) 2006-05-08 2007-11-15 Eastman Kodak Company Oled electron-injecting layer
CN100456488C (en) * 2006-06-26 2009-01-28 友达光电股份有限公司 Display faceplate of full color organic electroluminescence, and fabricating method
US20080023715A1 (en) * 2006-07-28 2008-01-31 Choi Hoi Wai Method of Making White Light LEDs and Continuously Color Tunable LEDs
US7969085B2 (en) * 2006-08-18 2011-06-28 Global Oled Technology Llc Color-change material layer
TWI378740B (en) * 2006-10-04 2012-12-01 Ritdisplay Corp Full-color organic light emitting diode display panel and method thereof
US7492312B2 (en) * 2006-11-14 2009-02-17 Fam Adly T Multiplicative mismatched filters for optimum range sidelobe suppression in barker code reception
US20080117362A1 (en) * 2006-11-21 2008-05-22 3M Innovative Properties Company Organic Light Emitting Diode Devices With Optical Microstructures
US8836212B2 (en) * 2007-01-11 2014-09-16 Qd Vision, Inc. Light emissive printed article printed with quantum dot ink
US20080176099A1 (en) * 2007-01-18 2008-07-24 Hatwar Tukaram K White oled device with improved functions
JP2008186872A (en) * 2007-01-26 2008-08-14 Fuji Xerox Co Ltd Organic electric field light-emitting element and display unit
US8795855B2 (en) * 2007-01-30 2014-08-05 Global Oled Technology Llc OLEDs having high efficiency and excellent lifetime
CN101271939B (en) * 2007-03-23 2010-12-15 光宝科技股份有限公司 Luminous device with open loop control and production method thereof
US20080284317A1 (en) * 2007-05-17 2008-11-20 Liang-Sheng Liao Hybrid oled having improved efficiency
US20080284318A1 (en) * 2007-05-17 2008-11-20 Deaton Joseph C Hybrid fluorescent/phosphorescent oleds
US8034465B2 (en) * 2007-06-20 2011-10-11 Global Oled Technology Llc Phosphorescent oled having double exciton-blocking layers
JP5773646B2 (en) 2007-06-25 2015-09-02 キユーデイー・ビジヨン・インコーポレーテツド Compositions and methods comprising depositing nanomaterials
US20090004485A1 (en) * 2007-06-27 2009-01-01 Shiying Zheng 6-member ring structure used in electroluminescent devices
WO2009014707A2 (en) 2007-07-23 2009-01-29 Qd Vision, Inc. Quantum dot light enhancement substrate and lighting device including same
US7812531B2 (en) 2007-07-25 2010-10-12 Global Oled Technology Llc Preventing stress transfer in OLED display components
US8128249B2 (en) * 2007-08-28 2012-03-06 Qd Vision, Inc. Apparatus for selectively backlighting a material
JP5669580B2 (en) * 2007-09-20 2015-02-12 ビーエーエスエフ ソシエタス・ヨーロピアBasf Se Electroluminescence device
DE102007053286A1 (en) 2007-09-20 2009-04-02 Osram Opto Semiconductors Gmbh Method for producing an optoelectronic component
US20090091242A1 (en) * 2007-10-05 2009-04-09 Liang-Sheng Liao Hole-injecting layer in oleds
US8420229B2 (en) * 2007-10-26 2013-04-16 Global OLED Technologies LLC OLED device with certain fluoranthene light-emitting dopants
US20090110956A1 (en) * 2007-10-26 2009-04-30 Begley William J Oled device with electron transport material combination
US8431242B2 (en) * 2007-10-26 2013-04-30 Global Oled Technology, Llc. OLED device with certain fluoranthene host
US8076009B2 (en) 2007-10-26 2011-12-13 Global Oled Technology, Llc. OLED device with fluoranthene electron transport materials
US8129039B2 (en) 2007-10-26 2012-03-06 Global Oled Technology, Llc Phosphorescent OLED device with certain fluoranthene host
US8016631B2 (en) * 2007-11-16 2011-09-13 Global Oled Technology Llc Desiccant sealing arrangement for OLED devices
US8900722B2 (en) 2007-11-29 2014-12-02 Global Oled Technology Llc OLED device employing alkali metal cluster compounds
US8877350B2 (en) * 2007-12-11 2014-11-04 Global Oled Technology Llc White OLED with two blue light-emitting layers
US20090162612A1 (en) * 2007-12-19 2009-06-25 Hatwar Tukaram K Oled device having two electron-transport layers
US20090191427A1 (en) * 2008-01-30 2009-07-30 Liang-Sheng Liao Phosphorescent oled having double hole-blocking layers
US8115399B2 (en) * 2008-02-19 2012-02-14 General Electric Company OLED light source
US20100314639A1 (en) * 2008-02-21 2010-12-16 Panasonic Corporation Light emitting device and display device using the same
US7534635B1 (en) 2008-03-24 2009-05-19 General Electric Company Getter precursors for hermetically sealed packaging
US7947974B2 (en) * 2008-03-25 2011-05-24 Global Oled Technology Llc OLED device with hole-transport and electron-transport materials
US8242487B2 (en) * 2008-05-16 2012-08-14 E I Du Pont De Nemours And Company Anode for an organic electronic device
US8324800B2 (en) * 2008-06-12 2012-12-04 Global Oled Technology Llc Phosphorescent OLED device with mixed hosts
KR101236242B1 (en) * 2008-07-03 2013-02-22 엘지디스플레이 주식회사 Organic electroluminescent device, substrate for the organic electroluminescent device and methode of fabricating the the same
US8247088B2 (en) * 2008-08-28 2012-08-21 Global Oled Technology Llc Emitting complex for electroluminescent devices
EP2161272A1 (en) 2008-09-05 2010-03-10 Basf Se Phenanthrolines
US7931975B2 (en) * 2008-11-07 2011-04-26 Global Oled Technology Llc Electroluminescent device containing a flouranthene compound
US8088500B2 (en) * 2008-11-12 2012-01-03 Global Oled Technology Llc OLED device with fluoranthene electron injection materials
EP2361445A4 (en) * 2008-12-01 2012-07-04 Du Pont Anode for an organic electronic device
US7968215B2 (en) * 2008-12-09 2011-06-28 Global Oled Technology Llc OLED device with cyclobutene electron injection materials
US8461758B2 (en) * 2008-12-19 2013-06-11 E I Du Pont De Nemours And Company Buffer bilayers for electronic devices
US8216697B2 (en) * 2009-02-13 2012-07-10 Global Oled Technology Llc OLED with fluoranthene-macrocyclic materials
US8147989B2 (en) * 2009-02-27 2012-04-03 Global Oled Technology Llc OLED device with stabilized green light-emitting layer
US20100244677A1 (en) * 2009-03-31 2010-09-30 Begley William J Oled device containing a silyl-fluoranthene derivative
US8283054B2 (en) 2009-04-03 2012-10-09 Global Oled Technology Llc Tandem white OLED with efficient electron transfer
US8206842B2 (en) 2009-04-06 2012-06-26 Global Oled Technology Llc Organic element for electroluminescent devices
WO2010145991A1 (en) 2009-06-18 2010-12-23 Basf Se Phenanthroazole compounds as hole transporting materials for electro luminescent devices
US20110010911A1 (en) * 2009-06-24 2011-01-20 Massachusetts Institute Of Technology Methods and apparatus for light harvesting in displays
US8877356B2 (en) * 2009-07-22 2014-11-04 Global Oled Technology Llc OLED device with stabilized yellow light-emitting layer
US8242489B2 (en) 2009-12-17 2012-08-14 Global Oled Technology, Llc. OLED with high efficiency blue light-emitting layer
JP2012114073A (en) * 2010-11-04 2012-06-14 Sony Corp Display device, method of manufacturing display device, and electronic apparatus
EP2579313B1 (en) 2011-09-22 2021-10-27 LG Display Co., Ltd. Organic light emitting diode display device and method of fabricating the same
US9929325B2 (en) 2012-06-05 2018-03-27 Samsung Electronics Co., Ltd. Lighting device including quantum dots
KR101948207B1 (en) * 2012-09-24 2019-04-26 삼성디스플레이 주식회사 White light emitting device, the white light emitting panel comprising the same, the method of manufacturing of the white light emitting panel, and the display apparatus comprising the white light emitting device
KR20150031819A (en) 2013-09-17 2015-03-25 삼성디스플레이 주식회사 Method for depositing thin film and method for fabricating organic light emitting display device using the same
CN103700692A (en) * 2013-12-27 2014-04-02 京东方科技集团股份有限公司 OLED (organic light emitting diode) display panel and production method thereof
US10309615B2 (en) 2015-02-09 2019-06-04 Sun Chemical Corporation Light emissive display based on lightwave coupling in combination with visible light illuminated content
KR102512069B1 (en) 2015-12-31 2023-03-21 삼성디스플레이 주식회사 Blue organic light emitting device and display device including the same
GB201718897D0 (en) 2017-11-15 2017-12-27 Microsoft Technology Licensing Llc Superconductor-semiconductor fabrication
US11024792B2 (en) 2019-01-25 2021-06-01 Microsoft Technology Licensing, Llc Fabrication methods

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS576883A (en) * 1980-06-13 1982-01-13 Sharp Kk Thin film el panel
IL80861A0 (en) * 1986-12-03 1987-03-31 Technoset Ltd Electroluminescent lighting elements
EP0349265A3 (en) * 1988-06-27 1990-03-14 EASTMAN KODAK COMPANY (a New Jersey corporation) Electroluminescent devices
US4999539A (en) * 1989-12-04 1991-03-12 Planar Systems, Inc. Electrode configuration for reducing contact density in matrix-addressed display panels

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