When it comes to electrochromism, you may think of tungsten oxide! After all, tungsten trioxide is the most studied inorganic electrochromic material and cathode coloring material. In fact, the research on electrochromism has a long history since researchers have discovered that current can cause optical changes.
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As early as 1953, a scientist named Charleston vividly described in his article that tungsten oxide is dissolved in sulfuric acid to form a film, and then an electric current is applied to cause a change in the color of the film. After scientific assumptions, he believes that the absorption and emission spectra of a dye may change by a few hundred angstroms under the action of a strong electric field. Back to today, tungsten oxide has been gradually applied to produce an electrochromic thin film and then be used to assemble an electrochromic glass for energy-saving. And in the future, you may see such a smart window everywhere.
