Nano yellow tungsten oxide, or nano particle size tungsten trioxide, or nano WO3, can be used as a cathode coloring material for smart window, mainly in the form of an electrochromic film, which can maintain very high light transmittance in both the colored state and the bleached state. In other words, such thin film will not affect the field of view with good thermal insulation effect. Therefore, WO3 has broad application prospects in the field of electrochromic smart windows.
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In practical applications, especially in smart window applications, the heat insulation film of a large area is often required. At present, the preparation of large-area electrochromic devices is mainly achieved by vacuum sputtering method, although it has the advantages of good bonding and high film purity. And it is easy to industrialize. However, the high cost, long coating time, and strong dependence on the vacuum limit its application in civil electrochromic smart windows. Therefore, experts are currently exploring ways to prepare large-area WO3 electrochromic films at lower cost and in shorter periods.
