Through-Space Charge-Transfer Thermally Activated Delayed Fluorescence Alternating Donor–Acceptor Copolymers for Nondoped Solution-Processable OLEDs
作者:George K. Belousov、Aliaksei A. Vaitusionak、Irina V. Vasilenko、Melika Ghasemi、Viktorija Andruleviciene、Aliaksei Ivanchanka、Dmytro Volyniuk、Hern Kim、Juozas Vidas Grazulevicius、Sergei V. Kostjuk
DOI:10.1021/acs.macromol.2c02582
日期:——
series of donor–acceptor alternating copolymers with Mn ≤ 12,000 g mol–1 and moderate polydispersity (Đ = 1.5–2.5) were synthesized via RAFT copolymerization of styrene-based donor monomers and maleimide-type acceptor monomers in the presence of S-dodecyl-S′-(α,α′-dimethyl-α″-acetic acid)trithiocarbonate as a chain transfer agent. It was shown that synthesized alternating copolymers were characterized
通过苯乙烯基供体单体和马来酰亚胺型受体单体的 RAFT 共聚,在S -十二烷基-S '-(α,α'-二甲基-α''-乙酸)三硫代碳酸酯作为链转移剂。结果表明,合成的交替共聚物具有高热稳定性(T d5= 375–465 °C),并且它们中的大多数通过空间电荷转移 (TSCT) 机制表现出激基复合物发射,并显示聚集诱导发射。合成共聚物的发光颜色在很大程度上取决于受体单体的性质,并且可以根据共聚物结构从蓝色变为橙色。这些固态共聚物在空气中表现出 0.35 至 6.2 μs 范围内的延迟荧光和适度的光致发光量子产率 (2.12–6.32%)。使用合成的交替共聚物作为发射体制备了多色无主体可溶液加工的 TADF OLED,其在不同电压下显示出良好的电致发光光谱稳定性。绿色发光器件达到了 7.84% 的最高外部量子效率。