Doped tungsten oxide is an active material for the absorption of radiation in the near infrared wavelength range so that it is often used as a near-infrared absorber in the production of heat insulation coating for obtaining energy efficient window/ smart window. Wherein, doped tungsten oxide may be cesium doped tungsten oxide, which is also known as cesium tungsten bronze with the formula of CsxWO3.

Tungsten oxide film is designed to fabricate electrochromic window, which is also called smart window. Some researchers have adopted a spin-coating technique to deposit tungsten oxide (WO3) film by using sol-gel peroxotungstic acid sol. And the prepared tungsten oxide thin film was used to produce smart window.

Nanocrystalline tungsten oxide is an important electrochromic material for producing electrochromic coating. It has been reported that nanocrystalline tungsten oxide electrochromic coating with excellent cycling stability can be prepared via a complexation-assisted sol–gel method. For the preparation process, a small amount of dopamine is added into the peroxotungstic acid precursor sol to form complexes with tungsten on the surface of peroxotungstic acid colloidal nanoparticles to enhance the electrochromic performance of WO3 coating, especially the electrochemical cycling stability.

Yellow tungsten oxide nanoparticles, or tungsten trioxide nanoparticles, or WO3 nanoparticles, may be applied to prepare building glass thermal insulation coating. Also, WO3 nano powder is of interest as an oxidant for metals in metastable intermolecular composites, which is useful for such applications as electric matches and gun primers.