WO3 can be made into an electrochromic film, and then be used to produce an electrochromic glass, and finally be applied for building doors and windows to provide high thermal insulation without affecting the passage of visible light. Electrochromic glass assembly assembled by WO3 electrochromic film prepared by propylene carbonate doped, polyethylene glycol doped and undoped, with 2.0V DC voltage, can achieve complete coloring-bleaching reversible cycle.

Tungsten trioxide nano powder may be used to prepare a WO3 electrochromic film, and then be used to prepare an all-solid-state electrochromic glass. Such smart glass is mainly applied to buildings or automobiles for heat insulation, energy reduction and environmental protection. Some experts used the sol-gel method to prepare WO3 electrochromic thin films by using tungsten powder and H2O2 as the main raw materials, and doping them with polyethylene glycol and propylene carbonate, and assembled such film into electrochromic glass devices.

Tungsten trioxide nanopowder may be prepared into a WO3 electrochromic film, and then be used to prepare an all-solid electrochromic glass - a smart glass, which is often applied in the field of building for achieving the performance of high thermal insulation, high heat preservation and high transparency. This is because nano particle size tungsten trioxide has excellent electrochromic properties as well as electrochemical stability. Therefore, WO3 has become one of the most studied electrochromic materials.

Tungsten trioxide nanopowder is an important raw material for the preparation of a smart window. The prepared all-solid smart window is often applied in smart buildings to play the role of heat insulation, energy conservation and consumption reduction. Experts have prepared smart heat insulating windows with better electrochromic reversibility and optical adjustment characteristics, which are structured with V2O5/solid lithium ion conductor/WO3.

Nano tungsten oxide may be used to prepare an electrochromic film, which may be used to produce a high-performance electrochromic glass, that is, an environmentally-friendly smart glass with heat insulating performance. According to experts, a complete electrochromic glass assembly consists of five layers: ITO conductive glass layer, electrochromic layer, ion conductor layer, complementary electrochromic layer, ITO conductive glass layer. The three layer film in the middle is the core material.

Tungsten oxide based inorganic electrochromic film may be used to prepare a high-performance, low-cost electrochromic device for applying to energy-saving buildings to play the role of heat insulation in summer and heat preservation in winter. Experts said that the WO3 film can be prepared by an electrodeposition method, which solves the limitation of the hydrothermal method on the film substrate.

Violet tungsten oxide can serve as a cathode electrochromic material - one of electrochromic materials. The other type is an anode electrochromic material. When the electrochromic material is at the cathode and is colored, it is called cathodic coloring, and its electrochemical reaction formula is:

Violet tungsten oxide, like yellow tungsten oxide or tungsten trioxide, is an electrochromic material that may be used to produce electrochromic devices, such as smart windows. For electrochromic materials, experts have introduced the rich colors that the film has in the process of coloring.

Violet tungsten oxide has photochromic properties so that it may be used to prepare a high performance photochromic thin film, that is, a heat insulating film, more specifically, a highly transparent thermal insulating film. According to the principle of photochromism, the thermal insulation film undergoes a color change reaction under the condition of light, and changes from colorless to blue, and has a good shielding effect on light intensity and ultraviolet light.

Violet tungsten oxide, like tungsten trioxide, has good electrochromic properties, so it may be used to prepare an environmentally friendly electrochromic thin film for applying in smart windows for the purpose of thermal insulation, heat preservation and energy conservation. From a professional point of view, this is because the architectural glass applying with the tungsten oxide electrochromic film has the adjustability of light absorption and transmission under the electric field, which can effectively control the external heat radiation and internal heat diffusion, and reduce the building energy consumption. Therefore, it has a huge market prospect.