Color-Stable White Organic Light-Emitting Diodes Utilizing a BlueEmitting Electron-Transport Layer

摘要

We have fabricated efficient and color-stable white organic light-emitting diodes (WOLEDs) based on a simpledouble-layer device structure consisting of a blue-emitting oligoquinoline electron-transport layer and a poly(N-vinyl carbazole)layer doped with phosphorescent green and red iridium emitters. Pure white color with the CIE coordinates from (0.30, 0.31)to (0.34, 0.37) in the whole operating bias voltage range and luminous efficiency higher than 7 cd/A at a brightness up to 12000 cd/m2 was achieved. These results demonstrate a new strategy to realizing easily processable, highly efficient, and colorstable WOLEDs with a simple structure.