A series of novel D–A and D–π–A push-pull systems based on a pyrazine and quinoxaline acceptor, bearing various electron-donating triphenylamine and carbazole moieties, are compared. A significant difference in electrochemical and photophysical properties was found depending on molecular structure. The compounds have strong solvatochromic properties. Quinoxaline-containing systems exhibit delayed fluorescence (DF) in thermal vacuum deposition films. Despite the low quantum yield of fluorescence in the solid state (less than 10%), organic light-emitting diodes with sufficiently high efficiency (4.2 cd/A) have been fabricated on the basis of this push-pull systems. The best results were obtained for compounds exhibiting DF. The possible channel for increasing the efficiency of OLED can be associated with the “hot excitons” mechanism.

比较了一系列基于吡嗪和喹喔啉受体的新型D–A和D–π–A推挽系统，它们带有给电子的三苯胺和咔唑基团。根据分子结构，发现电化学和光物理性质存在显着差异。该化合物具有很强的溶剂变色性质。含喹喔啉的体系在热真空沉积膜中显示出延迟的荧光（DF）。尽管固态荧光的量子产率很低（低于10％），但基于这种推挽系统仍可以制造出效率很高的有机发光二极管（4.2 cd / A）。表现出DF的化合物获得了最佳结果。用于提高OLED效率的可能渠道可能与“热激子”机制相关联。