Single-film electrochromic devices with polymer gel films containing aromatic electrochromics

✍ Scribed by Hiromori Tsutsumi; Yoko Nakagawa; Koji Tamura

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 364 KB
• Volume: 39
• Category: Article
• ISSN: 0927-0248
• DOI: 10.1016/0927-0248(95)00071-2

✦ Synopsis

A polymer gel film (poly(1-vinyl-2-pyrrolidinone-co-N, N'-methylenebisacrylamide), PVPD) containing a simple aromatic compound (p-diacetylbenzene, p-DAB, dimethyl-or diethyl terephthalate, p-DMP or p-DEP), 1-methyl-2-pyrrolidinone and an electrolyte salt is synthesized and its optical responses to applied voltages are investigated. The p-DAB/PVPD film is coloured in green on cathodic polarization at -1.2 V versus Pt wire (quasi-reference electrode), and p-DMP/PVPD and p-DEP/PVPD films are coloured in red on cathodic polarization at -2.5 V and -1.5 V versus Pt, respectively. They respond to the applied potential for about a few seconds. Their bleaching process is also rapid even under open-circuit condition. Therefore, the gel films have no optical memory effect. Furthermore, the gel film containing two kinds of colouring materials, p-DAB and p-DMP, is also prepared. The gel film shows multi-colouring behaviour, eolourless, green and red, on cathodic polarization.