A solid-state electrochromic device based on complementary polypyrrole polythiophene derivatives and an elastomeric electrolyte

A device was assembled using optically transparent glass electrodes and com bining two complementary electrochromic polymeric materials, poly(4,4'-dipe ntoxy-2,2'-bithiophene) and poly(N,N'-dimethyl-2,2'-bipyrrole). As electrol yte we used an ionically conductive polymer; poly(epichlorohydrin-co-ethyle ne oxide) containing a lithium salt. The optical contrast in the visible/ne ar infrared region, stability to repeated redox cycles and electrochromic e fficiency are reported and discussed.