Li Xiaoning, Tu Liangjing, Gao Mingxue, Li Aisen, Chen Yi, Chi Weijie, Zhang Dongdong, Duan Lian, Xie Yujun, Tang Ben Zhong, Li Zhen
Institute of Molecular Aggregation Science, Tianjin University, Tianjin 300072, China.
Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University Binhai New City, Fuzhou 350207, China.
J Phys Chem Lett. 2023 Aug 10;14(31):6982-6989. doi: 10.1021/acs.jpclett.3c01629. Epub 2023 Jul 31.
Exploring blue organic light emitting diodes (OLED) is an important but challenging issue. Herein, to achieve blue-shifted emission, cyclohexane is fused to quinoxaline to weaken the electron-withdrawing ability and conjugation degree of the acceptor. As a result, blue to cyan fluorescent emitters of Me-DPA-TTPZ, tBu-DPA-TTPZ, and TPA-TTPZ were designed and synthesized with donors of diphenylamine and triphenylamine, which exhibit high photoluminescence quantum yields and good thermal stability. In OLEDs with emitters of TPA-TTPZ, the sensitized and nonsensitized devices demonstrate deep-blue (449 nm) and blue (468 nm) emission with maximum external quantum efficiency and CIE coordinates of 6.1%, (0.15, 0.10) and 5.1%, (0.17, 0.22), respectively, validating their potential as blue emitters in OLEDs.
探索蓝色有机发光二极管（OLED）是一个重要但具有挑战性的问题。在此，为了实现蓝移发射，将环己烷与喹喔啉稠合以削弱受体的吸电子能力和共轭程度。结果，以二苯胺和三苯胺为供体，设计并合成了Me-DPA-TTPZ、tBu-DPA-TTPZ和TPA-TTPZ的蓝色至青色荧光发射体，它们表现出高光致发光量子产率和良好的热稳定性。在具有TPA-TTPZ发射体的OLED中，敏化和非敏化器件分别表现出深蓝色（449 nm）和蓝色（468 nm）发射，最大外量子效率和CIE坐标分别为6.1%，（0.15，0.10）和5.1%，（0.17，0.22），验证了它们作为OLED中蓝色发射体的潜力。
