Highly efficient and stable blue organic light-emitting diodes (OLEDs) cannot be easily obtained simultaneously. In particular, the efficiency roll-off as a reference index to evaluate the lifetime of deep-blue OLED at high luminescence is still severe. A novel molecule ( CzSiTrz ) connected with carbazole and triazine fragments by a nonconjugated silicon atom is designed. An intramolecular charge transfer emission and intermolecular exciplex luminescence in the aggregated state are obtained, resulting in a dual-channel intra/intermolecular exciplex ( DCIE ) emission with fast and efficient reverse intersystem crossing (RISC). Deep-blue OLED with Commission Internationale de l'Eclairage (CIE) coordinates of (0.157, 0.076) and a record-high external quantum efficiency (EQE) of 20.35% at high luminance (5000 cd m −2 ) is accomplished. Simple molecular synthesis and device fabrication of this strategy give a unique approach to realizing high-performance deep-blue electroluminescence.

中文翻译：

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基于双通道分子内/分子间激基复合物的高效深蓝光发光

高效稳定的蓝色有机发光二极管 (OLED) 很难同时获得。尤其是，效率滚降作为评估深蓝色OLED在高亮度下寿命的参考指标仍然很严重。设计了一种通过非共轭硅原子与咔唑和三嗪片段连接的新型分子 (CzSiTrz)。获得了聚集状态下的分子内电荷转移发射和分子间激基复合物发光，从而产生具有快速有效的反向系统间交叉 (RISC) 的双通道分子内/分子间激基复合物 (DCIE) 发射。国际照明委员会 (CIE) 坐标为 (0.157, 0.076) 的深蓝色 OLED，在高亮度 (5000 cd m−2) 完成。这种策略的简单分子合成和器件制造为实现高性能深蓝色电致发光提供了一种独特的方法。