The Prepareation And Performance Of Electrochromic Device Based On Organic Conjugated Materials

As functional organic materials, oligothiophenes and their derivatives are getting more and more attention because of their excellent optical and electrical properties. Oligothiophenes and their derivatives can be used in Electrochromic devices(ECD). ECD assembled with electrochromic materials can be used in a lot of commercial field, including smart window, automotive rear-view mirror, electrochromic display ect..In order to develop oligothiophenes and their derivatives and expand their application on electrochromism, tri(4-(2′-thienyl)) phenylamine(3TPA) has been synthesized, pured and Characterized b by MS, 1HNMR, 13 CNMR and IR. A kind of new electrochromic composite material(WO3/P3TPA) based on tungsten trioxide and 3TPA was prepared via electrochemical polymerization and vacuum deposition. A kind of new electrochromic copolymer P(EDOT-co-3TPA) based on 3TPA and EDOT was prepared via electrochemical polymerization. Liquid electrochromic devices with the above active material have been assembled and the structures of Liquid electrochromic devices are: ITO/electrochromic active layer/electrolyte solution/Pt. The photoelectric properties and electrochromic properties of P3 TPA, WO3/P3 TPA and P(EDOT-co-3TPA) have been studied.The results prove that : i)3TPA has no electrochromic phenomenon and its polymer(P3TPA) can transform reversibly from orange to dark blue with applied voltage and its coloring and bleaching switching time is up to 0.51 s and1.06 s respectively. ii) WO3/P3 TPA can transform reversibly from yellow to dark blue with applied voltage; Compared with WO3 active material, WO3/P3TPA’s coloring/bleaching switching times are rapider, and the open circuit memory ability is better and the coloration efficiency is higher. iii)P(EDOT-co-3TPA) have the property of reversible electrochromic phenomenon and the types of switching colors can been changed with different raw material ratios; Electrochemical polymerization with 3TPA and EDOT can improve the film-forming ability of EDOT; Compared with PEDOT, the coloring and bleaching switching times of P(EDOT-co-3TPA) copolymer materials are rapider.