Tungsten oxide can be applied to prepare an electrochromic film, and then be used to produce a new type of smart window, in which the WO3 electrochromic film plays a decisive role in the performance of the entire electrochromic window. In this regard, experts said that considering the performance, price and preparation process and other factors, from the current research results, tungsten oxide film is one of the best electrochromic materials.

Tungsten trioxide can be applied in the preparation of electrochromic smart window in the form of an electrochromic film. And the electrochromic window using WO3 film as an EC layer material is considered to be the most promising electrochromic device. However, at present, the research on smart windows is far less than the research on electrochromic materials. Although some samples of electrochromic windows have been developed, it is still necessary to make more in-depth research and improvement on its structure and manufacturing process in order to make it practical.

Amorphous WO3 film has a good electrochromic effect, so it is a well-known and the most widely studied electrochromic material, more specifically, an inorganic electrochromic material. So, why does an amorphous tungsten trioxide film have a good electrochromic effect?

Tungsten oxide, WO3-x, may be used to prepare thermal insulation material such as transparent heat insulation film, environmentally friendly thermal insulation coating, and smart windows, etc. As the research progresses, these energy-saving materials are gradually entering people's lives. These thermal insulating materials will be used in energy saving reconstruction of building. Therefore, more and more experts and scholars are beginning to become familiar with tungsten oxide. For example, some experts used XD-3 polycrystalline X-ray diffractometer to measure the X-ray diffraction (XRD) spectrum of the tungsten oxide nanopowder obtained by the experiment.