Two novel bipolar carbzol-triazole derivatives was synthesized by conjugating hole transporting moiety carbazole (Cbz) with electron transporting moiety triazole (TAZ) to achieve the bipolar molecules, which were employed as the hosts of emitting layer doped with blue emitter FIrpic inside blue phosphorescence OLEDs with high current efficiency of 50 and 50.6 cd/A, and EQE of 20% and 21.6%.
A high efficiency blue phosphorescence organic light emitting device (OLED) was demonstrated by using a novel electron transporting and wide band gap material, CbzTAZ, as host doping with blue emitter, iridium(III)bis[4,6‐(di‐fluorophenyl)‐pyridinato‐N, C2′]picolinate (FIrpic). By adjusting the doping ratio of FIrpic and the thickness of emitting layer, we obtained an efficient blue phosphorescence OLED with high current efficiency over 45 cd/A and high external quantum efficiency over 23%.
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