Solid-state electrochromic devices based on poly (phenylene vinylene) polymers

We present a solid state electrochromic device based on poly (phenylene vinylene) light-emitting polymers and explore device performance as a function of salt type, salt concentration, and polymer layer thickness. Salts employing organic anions display improved optical contrasts. Higher salt concentrations and thicker devices produce higher optical contrasts at the cost of slower switching speeds. Devices display high reversibility, dramatic optical contrasts (>40%), and low operating voltages (<2V) that are comparable to state-of-the-art conducting polymer electrochromic devices.