Cs doped tungsten oxide may be applied for producing near-infrared shielding material, which is a new type of environmentally friendly thermal insulation material. As we all know, the sun is constantly giving the earth's light and heat, and the waves that can reach the earth is mainly electromagnetic waves distributed in the wavelength range of 250nm-2500nm. The electromagnetic waves in this interval can be divided into ultraviolet light region, visible light region and the near-infrared zone. According to the experts, the solar radiation can be largely derived from visible light and near-infrared light.
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At this time, cesium-doped tungsten oxide, which is also known as cesium tungsten bronze, is found to be a thermal insulation material. As a transparent conductive oxide, it has a wide band gap. And the band gap is larger than the average energy of photons in the visible region, which cannot cause intrinsic excitation of cesium tungsten bronze. And a wider band gap means that the optical properties of the material are transparent in the visible light band. Therefore, it has good spectral selectivity, has the ding of reflecting infrared rays and absorbing ultraviolet rays, and has a high transmittance in the visible light region, which is gradually used as a heat insulating material in the preparation of nano transparent coating materials.
