Tungsten trioxide can be used as a photochromic film or an electrochromic film, for obtaining an intelligent building glass. We all know that in cold areas, glass window, glass door or glass curtain wall is the main reason of heat loss of building, so effective means must be used to solve this problem.

Amorphous WO3 electrochromic film has broad application prospects in smart windows due to its excellent electrochromic properties. The amorphous phase tungsten trioxide film can be deposited on transparent conductive ITO glass by RF magnetron sputtering technology using WO3 ceramic target as raw material. Experts also studied the effect of sputtering power on the structure and optical properties of the prepared WO3 electrochromic thin film, and the electrochromic properties of film.

WO3 electrochromic film is an important EC layer material for preparing electrochromic glass, that is, an electrochromic device. In general, in the actual preparation of electrochromic devices, electrochromic materials are required to have the characteristics of stable chemical properties, rapid color change response, high cycle life, reversible color change, highly sensitive color change, memory function and good electrochemical redox reversibility. But why the light transmission rate of electrochromic glass decreases when it bleaches after repeated use?

Yellow tungsten oxide, also known as tungsten trioxide, is the core material for the preparation of an electrochromic device. And WO3 is present in the electrochromic layer of smart window in the form of a layer of electrochromic film. So, why the bleaching process of WO3 film takes less time than the coloring process?