电致变色
三苯胺
氧化还原
材料科学
共价有机骨架
共价键
三嗪
化学工程
电化学
胺气处理
光化学
纳米技术
化学
高分子化学
有机化学
电极
物理化学
工程类
冶金
作者
Bhushan Kishor Nandre,Sayan Halder,Chanchal Chakraborty
标识
DOI:10.1002/asia.202401460
摘要
Porous covalent organic frameworks (COFs) offer significant advantages in electrochromic (EC) applications due to their high surface area and porosity, which facilitate faradaic redox‐mediated diffusion‐controlled processes. However, COFs remain underexplored as EC materials due to challenges such as limited solubility and poor film‐forming ability. In this study, we synthesized a redox‐active triphenylamine‐containing COF (TPA‐TCIF) on ITO glass via a solvothermal method tailored for electrochromism and electrofluorochromism. The COF, formed through the condensation of tris(4‐formyl phenyl)amine and 2,4,6‐tris‐(4‐aminophenyl)‐1,3,5‐triazine, features a high surface area of 1136.8 m²/g and a pore diameter of 1.18 nm. This structure promotes efficient ion transport, reducing switching times and enhancing coloration efficiency (CE). Reversible redox reactions induce a color change from yellow to red, with an optical contrast (∆T) of 37% and a CE of 47.7 cm²/C. The film exhibited stable electrofluorochromic (EFC) behavior, switching from yellow emissive to dark black upon voltage application, with stability over 40 cycles. A quasi‐solid‐state electrochromic device (ECD) based on TPA‐TCIF demonstrated reversible color transitions, showcasing its potential for future display technologies and highlighting the promise of COFs in advanced EC applications.
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