Thermally Activated Delayed Fluorescent Donor–Acceptor–Donor–Acceptor π-Conjugated Macrocycle for Organic Light-Emitting Diodes
作者:Saika Izumi、Heather F. Higginbotham、Aleksandra Nyga、Patrycja Stachelek、Norimitsu Tohnai、Piotr de Silva、Przemyslaw Data、Youhei Takeda、Satoshi Minakata
DOI:10.1021/jacs.9b11578
日期:2020.1.22
D-A-repeating structure, including more efficient thermally activated delayed fluorescence (TADF). Furthermore, an organic light-emitting diode (OLED) device fabricated with the macrocycle compound as the emitter has achieved a high external quantum efficiency (EQE) up to 11.6%, far exceeding the theoretical maximum (5%) of conventional fluorescent emitters and that with linear analog (6.9%).
一类新的热激活延迟荧光供体-受体-供体-受体 (DADA) π-共轭大环由两个 U 形电子受体(二苯并[a,j]吩嗪)和两个电子供体(N,N' -diphenyl-p-phenyelendiamine) 已被合理设计并成功合成。大环化合物显示出依赖于多晶型的构象和发射特性。具有线性替代物的大环物理化学性质的比较研究揭示了 DA 重复结构的结构环化的显着影响,包括更有效的热激活延迟荧光 (TADF)。此外,以大环化合物作为发射体制造的有机发光二极管 (OLED) 器件实现了高达 11.6% 的高外量子效率 (EQE),