Patent ID: 6067184
Filing Date: 2000-05-23
Classification: B82Y,G02F

Abstract:
An electrochromic device possessing the property of changing colour under the effect of an electric voltage, comprising at least one cathode (1,2) and one anode (7,8;8), at least one of these electrodes comprising a transparent or translucent substrate bearing an electrically conductive coating (2,7), and an electrolytic solution (4) arranged between these electrodes, and an electric circuit connecting by means of contacts (9) said cathode and anode, wherein the cathode bears a coating (3) consisting of at least one layer of at least one nanocrystalline semiconductive material, having a roughness factor at least equal to 20, on the surface of which is adsorbed a monolayer of electrically active molecules having the property of being colourless in the oxidised state and coloured in the reduced state, and wherein the anode comprises a metal having the property of being capable of being oxidised in a reversible manner, the oxidised form of said metal being soluble in the electrolytic solution.