By inserting a tricoordinate B atom into an indolo[3,2,1-jk]carbazole precursor, an efficient fused multiple resonance-induced thermally activated delayed fluorescence emitter was prepared, which exhibits a narrowband emission and a considerable reverse intersystem crossing rate. The corresponding organic light-emitting diode displays an external quantum efficiency of 27.2% with a suppressed efficiency roll-off.

中文翻译：

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用于高效窄带 OLED 的吲哚[3,2,1-jk]咔唑融合多共振诱导热激活延迟荧光发射器

通过在吲哚[3,2,1- jk ]咔唑前体中插入一个三配位B原子，制备了一种高效的稠合多重共振诱导热激活延迟荧光发射体，该发射体具有窄带发射和相当大的反向系间穿越率。相应的有机发光二极管显示出 27.2% 的外部量子效率，并抑制了效率滚降。