Liu Yang-Bo, Deng Hao-Tian, Zhang Li-Yi, Wei Jing-Hao, Dai Feng-Rong, Chen Zhong-Ning
College of Chemistry, Fuzhou University, Fuzhou 350108, China.
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350108, China.
Molecules. 2025 Feb 27;30(5):1099. doi: 10.3390/molecules30051099.
Synthesis of uniform and stable electrochromic films on a conductive layer is one of the effective ways to construct high-performance electrochromic devices. The development of more convenient and feasible polymer film preparation technology is important and necessary. Herein, we demonstrated the development of a continuous in situ polymerization method to prepare electrochromic film on ITO glass through Schiff base condensation of a tetraamine Fe-based complex and organic di-/tri-aldehyde precursors. The electrochromic film was successfully coated on the surface of the ITO conductive layer and exhibited uniform morphology and excellent stability. Film exhibited two reversible redox processes allowing two steps of electrochromic processes, including the oxidation of Fe(II) to Fe(III) at 1.05 V and oxidation of triphenylamine moieties to cation radicals at 1.4 V, which induced three stable color states from initial yellow to orange red and blue. The utilization of the so-formed polymer film for the fabrication of electrochromic devices gave rise to excellent electrochromic performance of fast response time of 0.4-1.2 s and high coloration efficiencies of 241.5-352.9 cm/C at 1.9 V (at 535 nm) and 2.5 V (at 755 nm). The present work provides a new feasible strategy for constructing polymer films for high-performance electrochromic devices.
在导电层上合成均匀且稳定的电致变色薄膜是构建高性能电致变色器件的有效方法之一。开发更便捷可行的聚合物薄膜制备技术具有重要意义且十分必要。在此，我们展示了一种连续原位聚合法，通过四胺铁基配合物与有机二醛/三醛前驱体的席夫碱缩合反应在ITO玻璃上制备电致变色薄膜。该电致变色薄膜成功涂覆在ITO导电层表面，呈现出均匀的形态和优异的稳定性。薄膜表现出两个可逆的氧化还原过程，允许进行两步电致变色过程，包括在1.05 V时将Fe(II)氧化为Fe(III)以及在1.4 V时将三苯胺部分氧化为阳离子自由基，这导致从初始黄色到橙红色和蓝色的三种稳定颜色状态。利用如此形成的聚合物薄膜制造电致变色器件，在1.9 V（535 nm处）和2.5 V（755 nm处）时具有0.4 - 1.2 s的快速响应时间和241.5 - 352.9 cm/C的高显色效率等优异的电致变色性能。本工作为构建用于高性能电致变色器件的聚合物薄膜提供了一种新的可行策略。
