Yellow Tungsten Oxide Electrochromic Film Applied for Smart Window

Yellow tungsten oxide electrochromic film can be used to prepare a smart window, which is a new type of energy-saving window with the advantage of environmental protection, so that it has broad application prospects in building field. According to experts, the WO3 film is an electrochromic material that can undergo a reversible change in color and transparency under the action of an applied electric field or current. In a common sense, it can exert a heat preservation effect and a heat insulating effect. In this regard, experts say that WO3 electrochromic film for smart energy-saving window can be produced by spray pyrolysis method.

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Experts introduced that the spray pyrolysis method is to spray a liquid precursor on the surface of the heated substrate such as W(CO)6, WCl6 solution and an aqueous solution of tungstic acid. The precursor is decomposed during the spraying process and reacts with the atmosphere to form a yellow tungsten oxide film. The tungsten trioxide film prepared by spray pyrolysis has extremely fine crystal grains and has a special morphology, thereby facilitating element doping and effectively improving electrochromic performance. In addition, the spray pyrolysis method is simple in operation, low in preparation cost, and can be used for large-area deposition.

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