Tungsten trioxide is assembled in a large area electrochromic device in the form of an electrochromic thin film to serve as a cathode coloring material. Experts said that for large-area electrochromic devices assembled with WO3 electrochromic film, in practical use, the cycle stability should also be taken into account in addition to factors such as light modulation range, coloring efficiency and response time.

Large area electrochromic device, with high thermal insulation and high heat preservation performance, is one of the main means to improve the energy-saving efficiency of buildings, wherein tungsten oxide is assembled in the form of an electrochromic film, playing the role of an electrochromic layer. While at present, large-area electrochromic devices have not been promoted. But why?

Tungsten oxide film may be applied for preparing an energy saving film. According to experts, the electrochromic phenomenon of such a tungsten trioxide electrochromic film for thermal insulating and energy-saving glass, that is, the conversion phenomenon between the colored state and the bleached state, can be explained by a double injection model.

What effect does the tungsten oxide electrochromic film for producing thermal insulating window glass have on the cycle stability of electrochromic devices? Through the XPS analysis of tungsten trioxide electrochromic thin film, the experts reached the following conclusions: