Enhancing electrochromic properties of conducting polymers via copolymerization:: Copolymer of 1-(4-fluorophenyl)-2,5-di(thiophen-2-yi)-1H-pyrrole with 3,4-ethylene dioxythiophene

A copolymer of 1-(4-fluorophenyl)-2,5-di(thiophel.1-2-yl)-1H-pyrrole (FPTP) with 3,4-ethylene dioxythiophene (EDOT) was electrochemically synthesized and characterized. While poly(FPTP) (P(FPTP)) has only two colors in its oxidized and neutral states (blue and yellow), its copolymer with EDOT has five different colors (purple, red, light gray, green, and blue). Electrochromic devices based on P(FPTP-co-EDOT) and poly(3,4-ethylenedioxythiophene) (PEDOT) were constructed and characterized. The oxidized state of the device shows blue color whereas it shows purple for the reduced state. At several potentials the device has good transparency with green and gray colors. Maximum contrast (Delta%T) and switching time of the device were measured as 23% and 1.1 s at 555 nm. (c) 2007 Wiley Periodicals, Inc.