As a near-infrared shielding material, tungsten oxide film is more and more well known, and tungsten oxide has therefore attracted much attention from scholars and researchers. According to the experts, the valence of tungsten in this tungsten oxide film includes W6+ and W5+.
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Studies have shown that a tungsten oxide film may include a substrate, a tungsten oxide film formed on the substrate and composed of a mixture of crystalline tungsten oxide and amorphous tungsten oxide, and a first protective layer formed on the surface of the tungsten oxide film. Wherein, crystalline tungsten oxide mainly has a good shielding effect on infrared light above 1500nm, and amorphous tungsten oxide has a good shielding effect on infrared light between 900-1200nm. It means that the near-infrared shielding material - tungsten oxide film has good shielding performance in the wavelength of 900-1500nm, which may be used to glass curtain walls or large area window glass of buildings.
