Multifunctional luminescent material based on quinoxaline and triphenylamine groups, polymorphism, mechanochromic luminescence, and applications in high-efficiency fluorescent OLEDs was written by Wen, Zhengjie;Yang, Tingting;Zhang, Di;Wang, Zhengqin;Dong, Shufan;Xu, Huixia;Miao, Yanqin;Zhao, Bo;Wang, Hua. And the article was included in Journal of Materials Chemistry C: Materials for Optical and Electronic Devices in 2022.Electric Literature of C8H4Br2N2 This article mentions the following:
Multifunctional materials with aggregation-induced emission (AIE), mechanochromic luminescence and electroluminescent (EL) features in organic light-emitting devices (OLEDs) are demonstrated to be promising applications in many fields. Herein, we present our work on TQT, using quinoxaline as an acceptor and triphenylamine (TPA) as a donor with a D-A-D sym. structure. TQT exhibits high-contrast polymorph-dependent emission, from green to red, and multicolor mechanochromic luminescence (MCL) in aggregate states. Five different crystals (TQT-G = 530 nm, TQT-Y = 575 nm, TQT-Y1 = 584 nm, TQT-O = 593 nm, and TQT-R = 600 nm) were obtained via the slow evaporation of a mixed solution All crystals and powder phases switch to showing emission at 546 nm after grinding. Among them, TQT-G exhibited remarkable H-aggregate behavior, while TQT-Y tends to form a J-aggregate state. TQT-G and TQT-Y1 have similar configurations and packing models but completely different emission characteristics. A doped device with 20 wt% TQT and a non-doped device showed good electroluminescence performance. In the experiment, the researchers used many compounds, for example, 5,8-Dibromoquinoxaline (cas: 148231-12-3Electric Literature of C8H4Br2N2).
5,8-Dibromoquinoxaline (cas: 148231-12-3) belongs to pyrazine derivatives. Pyrazines are volatile compounds that are used in the cosmetic, food, flavor, and fragrance industries. Pyrazine heterocycles and their benzo derivatives possess many interesting properties, including chemical reactivity profiles, and have diverse applications in total synthesis, medicine, chemical biology, materials, dyes, and imaging.Electric Literature of C8H4Br2N2