Organic light emitting devices (OLEDs) are provided. An exemplary OLED includes a substrate, a first electrode, a second electrode, and an organic layer between the first and second electrodes having a hole injection layer and an emissive layer. The emissive layer includes red, green and blue emissive...http://www.google.de/patents/US8053975?utm_source=gb-gplus-sharePatent US8053975 - Organic light emitting device
