Electrochromism: WO3 Film

Electrochromism of WO3 film is often studied, and the obtained tungsten trioxide electrochromic film is more and more widely used in building glass for heat insulation, thereby saving energy. Wherein, electrochromism refers to the phenomenon that the optical properties of a material undergo a stable and reversible color change under the action of an applied electric field, and the appearance is a reversible change in color and transparency. And tungsten trioxide film is an electrochromic film.

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When it comes to electrochromic material, experts have introduced that element doping is one of the ways to improve the electrochromic properties of tungsten oxide electrochromic film. For the doping of tungsten oxide, most of the commonly used elements are metal elements that are less electronegative or less oxidizing. Doping different elements can change the electrochromic properties of tungsten oxide films to varying degrees. For example, doping Si increases the coloring efficiency and ion diffusion coefficient of the film; doping V enhances color neutrality; and doping Sb and Nb increases the charge storage capacity and accelerates the color change response time.

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