Electrochromism: Yellow Tungsten Oxide Nanocrystalline Composite Film

Electrochromism refers to the phenomenon that optical properties such as transmittance and absorption of electrochromic materials undergo a stable and reversible color change under the action of an applied electric field. It means that electrochromism can occur in yellow tungsten oxide nanocrystalline composite film - an electrochromic material.

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As the most studied cathode electrochromic material, tungsten oxide electrochromic film has great application value in the field of building energy-saving glass due to its ability to adjust indoor lighting in real time and play a role in thermal insulation. So, it is believed that WO3 film coated glass is the next-generation energy-saving window material that is promising to replace Low-e coated glass. However, the shortcomings of the electrochromic material, such as small light modulation amplitude and long response time, restrict the development of electrochromic technology. In this regard, some experts have performed modification studies on tungsten oxide thin films through nanocrystallization and nanocrystalline composite methods to improve the conventional WO3 electrochromic materials with small light modulation amplitude and slow response speed. Wherein, yellow tungsten oxide nanocrystalline composite film is a WO3 composite thin film material obtained by a nanocrystalline composite method.

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