Tungsten oxide film, as an important functional material, is often used to produce an inorganic all solid-state electrochromic device. According to the experts, the excellent reversibility of such a device is associated to the presence of an optical free-carriers tail.

WO3 film is well-known as it is the most important electrochromic layer material for assembling an all-solid-state electrochromic device. According to the experts, an all-solid-state electrochromic device based on NiO/WO3 complementary structure and solid polyelectrolyte can be manufactured for modulating the optical transmittance.

WO3 film is often used as an electrochromic layer for the assembly of an all solid-state electrochromic device with the advantages of good durability, high transmittance modulation, high coloration efficiency and good response times. And such a device is more and more widely applied to the curtain wall for adjusting the solar heat radiation dynamically and saving energy.

WO3 film is the most popular material for assembly of an inorganic all solid-state electrochromic device with the characteristics of low power consumption (<2 V), high coloration efficiency and memory effects. So, such an electrochromic device has many potential applications in smart windows, mirrors, displays, and optical switching devices. Wherein, WO3 smart windows is regarded as an energy-saving window with a wide application in buildings and high-class automobiles.