High triplet energy materials based on dibenzothiophene and carbazolylcarbazole are developed as hosts for lifetime extension in blue phosphorescent organic light‐emitting diodes. Two host materials with or without a biphenyl linker between dibenzothiophene and carbazolylcarbazole are synthesized to get insight about the effect of aromatic linkers on the photophysical properties of the hosts and the device performances of a blue triplet emitter doped phosphorescent organic light‐emitting diodes. It is described that the host design with dibenzothiophene and carbazolylcarbazole at 4‐position of dibenzothiophene is effective for both high efficiency and improved lifetime. In particular, the new hosts improved the lifetime of the blue devices by more than five times while enhancing the quantum efficiency compared to a common triplet host.

中文翻译：

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基于二苯并噻吩和咔唑基咔唑的新型主体材料可延长蓝色磷光有机发光二极管的寿命

基于二苯并噻吩和咔唑基咔唑的高三重态能量材料被开发用作延长蓝色磷光有机发光二极管寿命的主体。合成了两种在二苯并噻吩和咔唑基咔唑之间带有或不带有联苯连接基的主体材料，以了解芳香族连接基对主体的光物理性能的影响以及蓝色三重态发射极掺杂的磷光有机发光二极管的器件性能。据描述，在二苯并噻吩的4-位使用二苯并噻吩和咔唑基咔唑的主机设计对于提高效率和延长寿命都是有效的。特别是，与普通的三重态主机相比，新主机将蓝色设备的寿命提高了五倍以上，同时提高了量子效率。