Bredereck oxazole synthesis was utilized to create a series of novel D-A polymers based on the triphenylamine (TPA) derivative, 4,4′-Diformyltriphenylamine (DPA), 4,4′-((4-bromophenyl)azanediyl)dibenzaldehyde (BPA), and oxamide/dithiooxamide. The obtained novel polymers exhibited impressive solution processabilities and excellent thermal stabilities. In the entire processes of electrochemical oxidation, these polymer films exhibited excellent electrochromic (EC) performances, high optical contrasts (49.6–52.8 %), high coloration efficiencies (362–451 cm·C), and excellent cycling stabilities (18.6–33.9 % decay) with a cycle time of 20 s. By applying voltage, electrofluorochromic (EFC) performance can also be adjusted. Furthermore, these polymers showed fluorescence (PL) in solvents and solvatochromic effects in absorption. The outcome was indicative of the addition of oxazole[5,4-]oxazoles (OzOz) and thiazolo[5,4-]thiazoles (TzTz), whose highly conjugate rigid planar structures can significantly increase molecule stabilities and minimizing volume shrinking during charge transfer. In addition, due to introducing bromine atoms, the p-π conjugations enhanced the conjugation degrees of the molecules, which facilitated the electron transfers. Experimental results show that these improvement schemes will pave a way for obtaining multi-function optoelectronic devices with long-term cyclic stabilities.

中文翻译：

---

基于含三芳基胺的恶唑[5,4-d]恶唑/噻唑并[5,4-d]噻唑的双功​​能DA型共轭聚合物表现出电荧光致变色和可逆电致变色

Bredereck 恶唑合成法被用来制造一系列基于三苯胺 (TPA) 衍生物、4,4'-二甲酰三苯胺 (DPA)、4,4'-((4-溴苯基)氮杂二基)二苯甲醛 (BPA) 的新型 DA 聚合物，和草酰胺/二硫代草酰胺。所获得的新型聚合物表现出令人印象深刻的溶液加工性能和优异的热稳定性。在整个电化学氧化过程中，这些聚合物薄膜表现出优异的电致变色（EC）性能、高光学对比度（49.6-52.8％）、高着色效率（362-451cm·C）和优异的循环稳定性（18.6-33.9％）衰减），循环时间为 20 秒。通过施加电压，还可以调节电荧光变色（EFC）性能。此外，这些聚合物在溶剂中表现出荧光（PL），在吸收中表现出溶剂化变色效应。结果表明添加了恶唑[5,4-]恶唑（OzOz）和噻唑并[5,4-]噻唑（TzTz），其高度共轭的刚性平面结构可以显着提高分子稳定性并最大限度地减少电荷转移过程中的体积收缩。此外，由于溴原子的引入，p-π共轭增强了分子的共轭度，有利于电子转移。实验结果表明，这些改进方案将为获得具有长期循环稳定性的多功能光电器件铺平道路。