Abstract The design and synthesis of four novel iridium (III) complexes, (Cz)2Ir(pic), (TPA)2Ir(pic), (PO-Cz)2Ir(pic) and (PO-TPA)2Ir(pic) carrying a hole-transporting carbazole/arylamine group, and/or an electron-transporting phosphine group, were reported on the base of iridium (III) [bis(4,6-difluorophenyl)pyridinato-N,C2]picolinate (FIrpic). The relationships between structures and characterization of four Ir complexes were shown. A few of phosphorescent organic light emitting diodes (PHOLED) doped with four Ir complexes were fabricated, and device using FIrpic with a 10 wt% doping ratio was also afforded for comparison. The bluish green device with (Cz)2Ir(pic) gave highest efficiencies with a maximum current efficiency (CEmax) of 34.7 cd/A, a maximum power efficiency (PEmax) of 20.5 lm/W and a maximum external quantum efficiency (EQEmax) of 11.8%, respectively. Notably, the efficiency roll-off decreases more slowly for (Cz)2Ir(pic) based device than those for other Ir complexes. The slow efficiency roll-off may be ascribed to simplification of electron injection of transportation for (Cz)2Ir(pic).

中文翻译：

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用于溶液处理电致磷光的含有外围咔唑/芳胺单元和/或氧化膦基团的多功能铱树枝状聚合物

摘要 四种新型铱 (III) 配合物 (Cz)2Ir(pic)、(TPA)2Ir(pic)、(PO-Cz)2Ir(pic) 和 (PO-TPA)2Ir(pic) 的设计与合成据报道，基于铱（III）[双（4,6-二氟苯基）吡啶-N，C2]吡啶甲酸酯（FIrpic）的空穴传输咔唑/芳胺基团和/或电子传输膦基团。显示了四种 Ir 配合物的结构和表征之间的关系。制造了一些掺杂有四种 Ir 配合物的磷光有机发光二极管 (PHOLED)，并且还提供了使用 10 wt% 掺杂比的 FIrpic 的器件进行比较。带有 (Cz)2Ir(pic) 的蓝绿色器件效率最高，最大电流效率 (CEmax) 为 34.7 cd/A，最大功率效率 (PEmax) 为 20。5 lm/W 和最大外量子效率 (EQEmax) 分别为 11.8%。值得注意的是，与其他 Ir 配合物相比，基于 (Cz)2Ir(pic) 的器件的效率滚降下降得更慢。缓慢的效率滚降可能归因于对 (Cz)2Ir(pic) 传输电子注入的简化。