Linjie Li, Yincai Xu, Zhang Dongyue, Yupei Qu, Yue Wang, Chenglong Li
-Cz-BNCz. Notably, RBN-ICz exhibits the lowest molecular weight among all reported red MR-TADF materials. The RBN-ICz-based organic light-emitting diode (OLED) achieves an external quantum efficiency (EQE) of 34.1% with Commission Internationale de l'Éclairage (CIE) coordinates of (0.67, 0.33), fully meeting the National Television System Committee (NTSC) red standard. This work offers an effective route for the development of high-efficiency, narrowband red MR-TADF emitters.