Tungsten Trioxide Electrochomic Properties

When people find tungsten trioxide film material has electrochromic properties, then they carried out extensive studies at electrochromic, photochromic Gaschromic discoloration film, and powder preparation and so on. What’s more it has achieved many fruitful results. Electrochromic material refers to a specific material be applied at a certain voltage and electric filed, the material’s color or transmittance will cause reversibly changes phenomenon. Amorphous tungsten trioxide film having high coloring efficiency, good reversibility, short response time, long useful life, low cost, coloring and fading ‘s optical change range wide and other advantages so it is considered to be the one of most promising electroluminescent material. WO3 electrochromic process is generally represented by the following formula: WO3 (transparent) + x (M ++ e-) ← → MxW6 + (1-x) W5 + xO3 (blue). The M + = H +, Li +, Na +, 0 <x≤1, e- is an electron. When the electron and ion implant into transparent WO3 film, the film was blue. When the ions and electrons are extracted, transparent films returns to its original state. This is due to partly +6valence of W6 + is reduced to +5 valence of + W5 which produce tungsten bronze MxWO3.

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