The luminance of different colors of light emitted from EL elements in a pixel portion of a light emitting device is equalized and the luminance of light emitted from the EL elements is raised. The pixel portion of the light emitting device has EL elements whose EL layers contain triplet compounds and...http://www.google.de/patents/US7042151?utm_source=gb-gplus-sharePatent US7042151 - Electrical equipment having light-emitting device with triplet and singlet compounds in the light-emitting layer
