Self‐Powered and Light‐Adaptable Stretchable Electrochromic Display

Abstract A stretchable electrochromic display with a self‐powered feature is an attractive concept in addressing the demands of information visualization and interaction without an external power supply for next‐generation wearable and portable electronics. Herein, a self‐powered stretchable electrochromic display is proposed for the first time, with WO 3 on the stretchable conductor as the electrochromic electrode integrated in parallel with the Zn/carbon electrodes and topped with a ZnCl 2 ‐based organohydrogel. This geometrically designed electrochromic device can be self‐colored by the chemical potential gap between WO 3 /Zn electrodes. The self‐bleaching process caused by the oxidation of the reduced WO 3 electrode is facilitated by the leakage current between the WO 3 /carbon electrodes. In this constructed self‐powered system, the electrochromic electrode shows reversible coloring/bleaching performance up to 50% strain and maintains favorable stability with power‐free reversible electrochemical switching for 400 cycles. Optical contrast retention at 81% is maintained for 200 stretching/recovery cycles. The prepared device combined with a phosphorescent substrate is demonstrated as a light‐adaptable stretchable display, where the “on/off” states of the display are shown in both bright and dark conditions without power consumption. This work provides broad application prospects for futuristic multifunctional stretchable and portable display electronics.