Triggering Thermally Activated Delayed Fluorescence by Managing the Heteroatom in Donor Scaffolds: Intriguing Photophysical and Electroluminescence Properties
作者:Rajendra Kumar Konidena、Kyung Hyung Lee、Jun Yeob Lee、Wan Pyo Hong
DOI:10.1002/asia.201900388
日期:2019.7
efficient delayed fluorescence with a high quantum yield and a short delayed exciton lifetime, whereas BFICNTrz displayed weak delayed fluorescence with a relatively long lifetime. Furthermore, a BTICNTrz‐based device exhibited a maximum external quantum efficiency (EQE) of 15.2 % and reduced efficiency roll‐off (12 %) compared with its BFICNTrz‐based counterpart, which showed a maximum EQE of 6.4 %
建立热活化延迟荧光(TADF)材料的结构与属性之间的关系已成为科学界的一项重要任务。在本文中,两个新的供体,10 ħ -benzofuro并[3,2- b ]吲哚(BFI)和10 ħ -苯并[4,5]噻吩并[3,2- b ]吲哚(BTI),已被开发并集成有芳基三嗪受体设计绿色TADF发射体苯并呋喃[3,2 - b ]吲哚-10-基)-5-(4,6-二苯基-1,3,5-三嗪-2-基)苄腈(BFICNTrz)和2-(10 H-苯并[4,5]噻吩并[3,2 - b ]吲哚-10-基)-5-(4,6-二苯基-1,3,5-三嗪-2-基)苄腈(BTICNTrz), 分别。通过交换供体支架中的杂原子,可以调节化合物的物理化学和电致发光特性。有趣的是,杂原子的电负性和施主单元的电离电势在控制化合物的单重态-三重态能量分裂和TADF机理中起着至关重要的作用。两种化合物均显示出类似的单态激发态,其源自电荷转移(CT)状态(1