Violet tungsten oxide nanopowder may be first prepared into a thin electrochromic film, and then be used to produce an electrochromic glass with excellent thermal insulation effect. Also, the obtained glass is a new environmentally friendly smart glass with high transparency, so it is increasingly applied in the field of building and high-end automobiles.
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It is well known that the heat radiation of the sun on the surface of the earth is equivalent to a black body with a temperature of 5800K. The energy of 95% of the radiation is concentrated between 0.3-2.5μm, of which about 40% is visible light, and 55% is infrared rays (heat radiation). While most of the objects on the earth have relatively low surface temperatures, and the wavelength of the thermal radiation they emit is much larger than 2.5μm. That is to say, the heat in the room is derived from the infrared radiation of the sun and the heat radiation of the ground objects, and the wavelength areas of the two heats are relatively large. While the tungsten oxide electrochromic window can be used to shield most of the heat energy.
