Tungsten Trioxide Applied for Energy-saving Smart Window

Tungsten trioxide is a new type of electrochromic material that is able to reversibly and persistently change its optical properties at an external voltage. Tungsten trioxide is considered as one of the most promising candidates for fabricating energy-saving smart window.

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According to the experts, the primary function of glass, particularly in architectural applications, is to transmit light. An energy-saving smart window would be one whose light transmission properties can be changed in response to an external stimulus such as light, heat, or electrical impulse. Well-known examples are photochromic, thermochromic, and electrochromic glasses. Electrochromism is broadly defined as a reversible optical change in a material induced by an external voltage. There are many inorganic and organic species showing electrochromic properties throughout the electromagnetic spectrum. Wherein, tungsten trioxide is the most studied inorganic electrochromic material. And it is believed that tungsten trioxide is promising in applications of energy saving buildings.

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