High-efficiency orange and red thermally activated delayed fluorescent (TADF) organic light-emitting diodes were fabricated based on a pair of isomers 3,6,11-triAC-BPQ and 3,6,12-triAC-BPQ, containing a rigid dibenzo[f,h]pyrido[2,3-b]quinoxaline (BPQ) core and three 9,9-dimethyl-9,10-dihydroacridine (Ac) donors. Both materials exhibited red emission in neat films and small singlet–triplet energy gaps. Compared with the stable intramolecular charge transfer (ICT) state of 3,6,12-triAC-BPQ, 3,6,11-triAC-BPQ showed hybridized local and charge transfer (HLCT) character due to the H-bond between the 11-position Ac and 10-position N atom. As a result, the doped film of 3,6,11-triAC-BPQ showed a high photoluminescence quantum yield (PLQY) and the related device showed a high external quantum efficiency (EQE) of 22.0% in the orange–red region.

中文翻译：

---

基于刚性二苯并[f，h]吡啶并[2,3-b]喹喔啉受体的高效橙红色热激活延迟荧光分子内H键设计

基于一对含有刚性二苯并苯并的异构体3,6,11-triAC-BPQ和3,6,12-triAC-BPQ制备了高效橙色和红色热活化延迟荧光（TADF）有机发光二极管。 [ f，h ] pyrido [2,3- b]喹喔啉（BPQ）核心和三个9,9-二甲基-9,10-二氢ac啶（Ac）供体。两种材料均在整齐的薄膜中显示出红色发射光，并且单重态-三重态的能隙较小。与3,6,12-triAC-BPQ的稳定分子内电荷转移（ICT）状态相比，3,6,11-triAC-BPQ由于11位之间的H键具有杂交的局部电荷转移（HLCT）特性位置的Ac和10位的N原子。结果，3,6,11-triAC-BPQ的掺杂膜显示出高的光致发光量子产率（PLQY），并且相关器件在橙红色区域中显示出22.0％的高外部量子效率（EQE）。