Abstract
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.
Published Version
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