Zhu Yunlong, Qu Cheng, Ye Jianjiang, Xu Yincai, Zhang Zuolun, Wang Yue
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012 P. R. China.
ACS Appl Mater Interfaces. 2022 Oct 26;14(42):47971-47980. doi: 10.1021/acsami.2c12778. Epub 2022 Oct 11.
Nowadays, thermally activated delayed fluorescence (TADF) compounds with a fused-ring core skeleton are getting increasing research interest because of their use in high-performance organic light-emitting diodes (OLEDs). In this study, TADF compounds featuring a D-A-type fused-ring core skeleton are developed. The challenging compatibility of a planarized D-A arrangement and the TADF property is achieved through linking the D and A moieties with two oxygen atoms within a six-membered ring. Compared with a single-oxygen analogue possessing a flexible skeleton and a twisted D-A arrangement, these fused-ring compounds with higher skeleton rigidity show higher photoluminescence quantum yields and narrower emission spectra in toluene and in doped thin films. Their electroluminescent devices achieve high external quantum efficiencies (up to 19.4%), suggesting the potential of rarely achieved D-A-type fused-ring TADF systems to serve as high-performance emitters of OLEDs.
如今，具有稠环核心骨架的热激活延迟荧光（TADF）化合物因其在高性能有机发光二极管（OLED）中的应用而受到越来越多的研究关注。在本研究中，开发了具有D-A型稠环核心骨架的TADF化合物。通过在六元环内用两个氧原子连接D和A部分，实现了平面化D-A排列与TADF性质具有挑战性的兼容性。与具有柔性骨架和扭曲D-A排列的单氧类似物相比，这些具有更高骨架刚性的稠环化合物在甲苯和掺杂薄膜中表现出更高的光致发光量子产率和更窄的发射光谱。它们的电致发光器件实现了高外部量子效率（高达19.4%），这表明很少实现的D-A型稠环TADF系统有潜力作为OLED的高性能发光体。
