Hexyl‐Derivatized Poly(3,4‐ethylenedioxyselenophene): Novel Highly Stable Organic Electrochromic Material with High Contrast Ratio, High Coloration Efficiency, and Low‐Switching Voltage

A novel family of electrochromic materials has been discovered. The electropolymerized poly(hexyl-3,4-ethylenedioxyselenophene) film switches color between a highly absorbing pure blue and a nearly colorless bleached state, achieves both a high contrast ratio of 88–89% and a high CE of up to 773 cm2 C−1 while showing a fast switching time and remarkable stability with the contrast ratio remaining 48% after 10000 cycles.