Abstract The effect of triphenylsilyl group substitution in the host materials for blue phosphorescent organic light-emitting diodes was studied by synthesizing two hole transport type hosts with and without the triphenylsilyl group in the identical backbone structure. The two host materials were applied as the hosts of blue phosphorescent emitter and the comparison of the emission behavior of the two hosts revealed that the triphenylsilyl group suppressed triplet exciton quenching of the blue phosphorescent emitters. As a result, the blue host with the triphenylsilyl group showed improved device efficiency and extended device lifetime in the blue phosphorescent devices. The blue phosphorescent device with the triphenylsilyl group substituted host showed improved external quantum efficiency and elongated device lifetime compared to the triphenylsilyl free host based device. The bulky triphenylsilyl group was effective to extend the device lifetime of the blue phosphorescent device through reduced triplet exciton induced annihilation.

中文翻译：

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蓝色磷光有机发光二极管主体的三苯基甲硅烷基取代对器件降解机制的抑制

摘要 通过合成具有相同骨架结构和不具有三苯基甲硅烷基的两种空穴传输型主体，研究了三苯基甲硅烷基取代在蓝色磷光有机发光二极管主体材料中的作用。将两种主体材料用作蓝色磷光发射体的主体，比较两种主体的发射行为表明，三苯基甲硅烷基抑制了蓝色磷光发射体的三线态激子猝灭。结果，具有三苯基甲硅烷基的蓝色主体在蓝色磷光器件中显示出提高的器件效率和延长的器件寿命。与基于不含三苯基甲硅烷基的主体的器件相比，具有三苯基甲硅烷基取代主体的蓝色磷光器件显示出改善的外部量子效率和延长的器件寿命。庞大的三苯基甲硅烷基通过减少三线态激子诱导的湮灭，有效地延长了蓝色磷光器件的器件寿命。