Tungsten oxide nano particles, an inorganic electrochromic material, may be applied for preparing heat-insulating energy-saving glass. And the glass will be more and more widely applied in building due to its own excellent optical performance – shield ultraviolet and infrared rays without affecting the transmittance of visible light.

Tungsten trioxide nanoparticles for preparing heat-insulating energy-saving glass, an electrochromic material, can exert a "dimming" effect. According to experts, the focus on electrochromic materials began in the early 1960s, when Platt discovered electrochromism while studying organic pigments.

Violet tungsten oxide may be used to prepare a new transparent glass heat insulation coating. The obtained smart coating has high visible light transmittance, low ultraviolet light and near-infrared light transmittance. Also, the coating has the characteristics of low cost, no toxicity and environmental friendliness. Therefore, the thin film has great development potential.

Violet tungsten oxide for sun protection film can be prepared by a sol-gel method. Experts say that the preparation method has the advantages of high purity of the product. This method is suitable for the preparation scheme that has doping requirements of the reaction product, particularly, for the preparation of uniform films, coatings and the like.