Multicolored electrochromic copolymer based on 1,4-di(thiophen-3-yl)benzene and 3,4-ethylenedioxythiophene

► The copolymer film P(DTB-EDOT) possesses four various colors (red, yellow, green and blue), containing all the three primary colors. ► P(DTB-EDOT) has fast switching time (0.8 s at 746 nm). ► P(DTB-EDOT) shows high optical contrast (59% at 1100 nm). ► P(DTB-EDOT) exhibits excellent stability.