The development and enrichment of organic materials with narrowband emission in longer wavelength regions beyond 515 nm still remains a great challenge. Herein, a synthetic methodology for narrowband emission materials has been proposed to functionalize multiple resonance (MR) skeletons and generate a universal building block, namely, the key intermediate DtCzB-Bpin, which can be utilized to construct multifarious thermally activated delayed fluorescence (TADF) materials with high color purity through a simple one-step Suzuki coupling reaction. Based on this unique synthetic strategy, a series of efficient narrowband green TADF emitters has been constructed by localized attachment of 1,3,5-triazine and pyrimidine derivatives-based acceptors onto B–N-containing MR frameworks with 1,3-bis(3,6-di-tert-butylcarbazol-9-yl)benzene (DtCz) as the ligand. The precise modulation of the acceptor is an intelligent approach to achieve bathochromic shift and narrowband emission simultaneously. The DtCzB-TPTRZ-based organic light-emitting diode (OLED) exhibits pure green emission with Commission Internationale de L’Eclairage (CIE) coordinates of (0.23, 0.68), a maximum external quantum efficiency (EQE) of 30.6%, and relatively low efficiency roll-off.

在超过 515 nm 的较长波长区域具有窄带发射的有机材料的开发和富集仍然是一个巨大的挑战。在此，提出了一种窄带发射材料的合成方法来功能化多共振 (MR) 骨架并生成通用构建块，即关键中间体 DtCzB-Bpin，可用于构建多种热激活延迟荧光 (TADF)通过简单的一步 Suzuki 偶联反应获得高色纯度的材料。基于这种独特的合成策略，通过将基于 1,3,5-三嗪和嘧啶衍生物的受体局部连接到含有 1,3-bis( 3,6-二叔-丁基咔唑-9-基)苯(DtCz)作为配体。受体的精确调制是同时实现红移和窄带发射的智能方法。基于 DtCzB-TPTRZ 的有机发光二极管 (OLED) 表现出纯绿色发射，国际照明委员会 (CIE) 坐标为 (0.23, 0.68)，最大外量子效率 (EQE) 为 30.6%，相对于低效率滚降。