| abstract |
An OLED device comprises a cathode, an anode, and having therebetween a light emitting layer, the device further comprising a layer on the cathode side of the emitting layer containing an anthracene compound bearing a diarylamine group; provided either (1) there is present an organic layer contiguous to the cathode that is substantially free of an anthracene compound bearing a diarylamine group, or (2) there are present independently selected diarylamine groups in both the 9- and 10-positions of the anthracene. The invention provides an improved combination of efficiency, operational lifetime, and lower operational voltage. |