Highly efficient single-emitting-layer white organic light-emitting diodes with reduced efficiency roll-off

Qi Wang; Junqiao Ding; Dongge Ma; Yanxiang Cheng; Lixiang Wang
March 2009
Applied Physics Letters;3/9/2009, Vol. 94 Issue 10, pN.PAG
Academic Journal
By codoping blue and orange phosphorescent dyes into a single host material, a highly efficient white organic light-emitting diode (WOLED) with Commission Internationale de L’Eclairage coordinates of (0.38, 0.43) at 12 V is demonstrated. Remarkably, this WOLED achieves reduced current efficiency roll-off, which slightly decreases from its maximum value of 37.3–31.0 cd/A at 1000 cd/m2. The device operational mechanism is subsequently investigated in order to unveil the origin of the high performance.


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