A fast-response electrochromic device based on a composite gel film comprising triphenylamine derivatives and WO3

Abstract

To obtain an electrochromic device with a quick response and multicolor change, N,N′-(4-((3-(triethoxysilyl)propyl)imino)methyl)phenyl-N,N′-diphenyl-4,4′-biphenyl-diamine (TPB-PSSO) containing a tetraphenylbenzidine (TPB) unit and siloxane group was synthesized, and its electrochromic properties were investigated. Using the TPB-PSSO gel film and a WO₃/TPB-PSSO gel film as active materials, electrochromic devices (ECDs) having the structures indium tin oxide (ITO)/TPB-PSSO gel film/ITO and ITO/WO₃ film/TPB-PSSO gel film/ITO, respectively, were prepared. These two devices exhibited a fast response according to chronoamperometry measurements, with coloring and bleaching times of 4 and 9 ms and 5 and 5 ms, respectively.