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Ideal bipolar host materials with bis-benzimidazole unit for highly efficient solution-processed green
Wei Jiang1, Jinan Tang, Xinxin Ban
1School of Chemistry and Chemical Engineering, Southeast University , Nanjing, Jiangsu 211189, P. R. China.
Organic Letters
|September 27, 2014
Abstract:
An ideal host material with high triplet energy, suitable HOMO energy level, excellent thermal and electrochemical stability, and bipolar charge carrier transport ability was synthesized. A high external quantum efficiency of 13.7% and a luminance efficiency of 48.2 cd A(-1) with low efficiency roll-off were achieved in solution-processed green electrophosphorescent devices.
