page_title: Electrochromism
hierarchical_section_title: Electrochromism
caption_attribution_description: English: redox couple for a viologen
context_page_description: Electrochromism is the phenomenon where the color or opacity of a material changes when a voltage is applied. By doing so, an electrochromic smart window can block ultraviolet, visible or infrared light instantaneously and on demand. The ability to control transmittance of near infrared light can increase the energy efficiency of a building, reducing the amount of energy needed to cool during summer and heat during winter.
  As the color change is persistent and energy need only be applied to effect a change, electrochromic materials are used to control the amount of light and heat allowed to pass through a surface, most commonly smart windows. One popular application is in the automobile industry where it is used to automatically tint rear-view mirrors in various lighting conditions.
context_section_description: Electrochromism is the phenomenon where the color or opacity of a material changes when a voltage is applied. By doing so, an electrochromic smart window can block ultraviolet, visible or (near) infrared light instantaneously and on demand. The ability to control transmittance of near infrared light can increase the energy efficiency of a building, reducing the amount of energy needed to cool during summer and heat during winter.
  As the color change is persistent and energy need only be applied to effect a change, electrochromic materials are used to control the amount of light and heat allowed to pass through a surface, most commonly smart windows. One popular application is in the automobile industry where it is used to automatically tint rear-view mirrors in various lighting conditions.
caption: Redox couple for a viologen. The 2+ species on the left is colorless, and the 1+ species on the right is deep blue or red, depending on the identity of R.[1]
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