MoO3 doped yellow tungsten oxide can be used to prepare an electrochromic film. Some experts use a square wave voltage with a period of 50s×2 to drive the doped tungsten trioxide film to have an electrochromic phenomenon. The coloring voltage was -1.7V, the bleaching voltage was +1.9V, and the transmission spectrum of the visible light and its adjacent region was measured with a spectrophotometer. They found that:

MoO3 doped tungsten oxide electrochromic film can be prepared by an electron beam evaporation method in an ultra-high vacuum electron beam coating machine. Specifically, the steps are as follows:

MoO3 doped tungsten trioxide thin film can be prepared by electron beam evaporation method. Among them, some experts used electron beam evaporation method to prepare tungsten trioxide electrochromic films with different MoO3 doping amount. They found that the obtained the electrochromic films of doped tungsten trioxide have better electrochromic properties.

Doped tungsten oxide can be used to prepare a thin film like tungsten oxide. So, what kind of film is prepared? A functional film, more specifically, an electrochromic film. It is mainly applied to the smart windows.