Tungsten oxide is one of the most widely used inorganic electrochromic materials that can be used to prepare a large area smart glass, that is, an electrochromic device for thermal insulation and heat preservation with high transparency (without affecting day lighting). As you may have known, one of the important properties of electrochromic devices is the response time.

Tungsten oxide film is an extremely important inorganic electrochromic material that can be used to prepare a smart glass window, which is a new technology of energy-saving glass. And the properties of such smart glass can be dynamically controlled.

Yellow tungsten oxide can be used to prepare a large area smart glass that can adjust the transmittance of visible light (350-850nm) and near-infrared light (850-2500nm), wherein the adjustment range can reach more than 50%. In other words, such smart glass can shield heat without affecting the indoor day lighting.

Yellow tungsten oxide electrochromic film, or WO3 electrochromic film, is an inorganic electrochromic material that can be used to prepare electrochromic devices with good coloring properties, large viewing angle, economy, memory effect and low energy consumption. And it is also the most studied electrochromic material. But what is the working principle of an electrochromic device assembled with a tungsten oxide film?