AbstractConstructing organic near‐infrared (NIR) luminescent materials to confront the formidable barrier of “energy gap law” remains challenging. Herein, two NIR thermally activated delayed fluorescence (TADF) molecules named T‐β‐IQD and TIQD were developed by connectingN,N‐diphenylnaphthalen‐2‐amine and triphenylamine with a novel electron withdrawing unit 6‐(4‐(tert‐butyl)phenyl)‐6H‐indolo[2,3‐b]quinoxaline‐2,3‐dicarbonitrile. It is confirmed NIR‐TADF emitters concurrent with aggregation‐induced emission effect, J‐aggregate with intra‐ and intermolecular CN⋅⋅⋅H−C and C−H⋅⋅⋅π interactions, and large center‐to‐center distance in solid states can boost the emissive efficiencies both in thin films and non‐doped organic light‐emitting diodes (OLEDs). Consequently, the T‐β‐IQD‐based non‐doped NIR‐OLED achieved the maximum external quantum efficiency (EQEmax) of 9.44 % with emission peak at 711 nm, which is one of the highest efficiencies reported to date for non‐doped NIR‐OLEDs.

中文翻译：

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非掺杂电致发光器件中的高效近红外热激活延迟荧光发射器

摘要构建有机近红外（NIR）发光材料来应对“能隙定律”的巨大障碍仍然具有挑战性。在此，通过连接开发了两种近红外热激活延迟荧光（TADF）分子，称为 T-β-IQD 和 TIQD氮,氮具有新型吸电子单元 6-(4-(叔丁基)苯基)-6 的-二苯基萘-2-胺和三苯胺H‐吲哚并[2,3-b]喹喔啉-2,3-二甲腈。已证实 NIR-TADF 发射体同时存在聚集诱导发射效应、具有分子内和分子间 CN⋅⋅⋅H−C 和 C−H⋅⋅⋅π 相互作用的 J 聚集体以及固体中较大的中心距态可以提高薄膜和非掺杂有机发光二极管（OLED）的发射效率。因此，基于T-β-IQD的非掺杂NIR-OLED实现了最大外量子效率（EQE最大限度）为 9.44%，发射峰值为 711 nm，这是迄今为止报道的非掺杂 NIR-OLED 的最高效率之一。