WO3, or tungsten trioxide, has excellent optical properties, so it may be used to prepare an inorganic electrochromic film, that is, a smart film. Such smart film may be applied to glass windows such as buildings, automobiles and airplanes to achieve the performance of heat insulation and heat preservation. According to experts, the optical modulation properties of tungsten trioxide electrochromic films are closely related to their structure.

WO3 nanopowder is an inorganic electrochromic material that exists as a layer of transparent electrochromic film on an electrochromic glass. Since Deb discovered the electrochromic phenomenon of tungsten trioxide film in 1969, extensive research has been carried out on inorganic electrochromic materials and great progress has been made.

Blue tungsten oxide electrochromic film may be used to produce an electrochromic glass, and therefore be applied building glass to obtain a smart window, which is also known as a smart heat insulating glass and a new energy-saving material. As you may have known, requirements for building energy conservation in China are getting higher and higher. Also, the requirements of the energy conservation and intelligence of doors and windows are also getting higher and higher. Nowadays, the types of energy-saving glass used for doors and windows are also increasingly abundant, and electrochromic glass has become a frontier and hot spot for research at home and abroad.

Blue tungsten oxide nano powder has electrochromic properties, so it may be used to prepare a smart window. And the prepared window is suitable for applying to building or automotive window in areas that has a temperate climate or in other places with obvious temperature changes, so tungsten oxide smart glass is the development direction of intelligent buildings.