In this work, two new bipolar host materials 3-(5-(9H-carbazol-9-yl)-4'-(1-phenyl-1H-benzo[d]imidazole-2-yl)-[1,1′-biphenyl]-2-yl)-9- phenyl-9H-carbazole (BCZ-PBM) and 3-(5-(9H-carbazol-9-yl)-3'-(4,6- diphenyl-1,3,5-triazin-2-yl)-[1,1′-biphenyl]-2-yl)-9-phenyl-9H-carbazole (BCZ-TRZ) were designed and synthesized by introducing benzimidazole and triazine groups as acceptor units with carbazole as the donor unit. These two compounds have excellent thermal stability with a high glass transition temperature (T_g > 160 °C) and thermal decomposition temperature (T_d > 450 °C). Green phosphorescent organic light-emitting devices (PHOLEDs) D1 and D2 were obtained by doping Ir(ppy)₃ into BCZ-PBM and BCZ-TRZ, in which BCZ-PBM based device D1 revealed better performance with an external quantum efficiency (EQE) of 20.4%, maximum current efficiency (CE) of 69.3 cd/A, and maximum power efficiency (PE) of 54.8 lm/W. Notably, the BCZ-PBM-based device exhibited excellent efficacy stability and a low efficiency roll-off of 1.7% at 1000 cd/m² and 4.7% at 5000 cd/m².

在这项工作中，两种新的双极性主体材料3-（5-（9 H-咔唑-9-基）-4'-（1-苯基-1 H-苯并[ d ]咪唑-2-基）-[1， 1'-联苯基] -2-基）-9-苯基-9 H-咔唑（BCZ-PBM）和3-（5-（9 H-咔唑-9-基）-3'-（4,6-二苯基通过引入苯并咪唑和三嗪设计并合成了-1,3,5-三嗪-2-基）-[1,1'-联苯] -2-基）-9-苯基-9 H-咔唑（BCZ-TRZ）基团作为受体单元，咔唑作为供体单元。这两种化合物具有出色的热稳定性，具有高的玻璃化转变温度（T _g  > 160°C）和热分解温度（T _d） > 450°C）。通过将Ir（ppy）₃掺杂到BCZ-PBM和BCZ-TRZ中获得绿色磷光有机发光器件（PHOLED）D1和D2 ，其中基于BCZ-PBM的器件D1表现出更好的性能和外部量子效率（EQE）最大电流效率（CE）为69.3 cd / A，最大功率效率（PE）为54.8 lm / W。值得注意的是，基于BCZ-PBM的设备表现出出色的功效稳定性，并且在1000 cd / m ^2时的低效率滚降为1.7％，在5000 cd / m ^2时为4.7％。