High efficiency, color stability, and stable efficiency roll off in three color hybrid white organic light emitting diodes

Kyoung Soo Yook; Soon Ok Jeon; Chul Woong Joo; Jun Yeob Lee
August 2008
Applied Physics Letters;8/18/2008, Vol. 93 Issue 7, p073302
Academic Journal
High efficiency, good color stability, and stable efficiency roll off were achieved in three color white organic light emitting diodes by developing a device architecture with red and green phosphorescent materials codoped in a mixed host emitting structure. A fluorescent blue material was used in a blue emitting layer and a mixed interlayer structure was applied. A high quantum efficiency of 9.7% was obtained and color coordinate of (0.40, 0.40) was kept constant up to luminance of 10 000 cd/m2. In addition, efficiency decrease at 10 000 cd/m2 was only 2% of the maximum quantum efficiency.


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