Tungsten Oxide Photochromic Detection

Research tungsten oxide photochromic almost half a century, but uncertainty and change color to characterize the selected light source so that the unity of development is very slow. 1973 Dbell use urbach rules: K = K0exp {-B (E0g-hv) / KT} where hv is the radiation energy, features B and all the material constants. Selecting the appropriate light source, is the key to the realization of discoloration. The current sources are mainly two kinds of pressure mercury lamp and a high pressure xenon lamp, wattage of light source of different, there are a mercury lamp 500W, 400W, 250W, 150W, etc; xenon lamp has a 50 () W, 200W, 150W, 75W and the like. Although only change the wattage of light intensity, but it reflects the color properties of tungsten oxide. In particular, to meet the different needs from the viewpoint of the photochromic material under the sun light is sunglass manufacturers have been pursued, and long-term stability of high-band color material is desired field of information, and requires a material having a display aspect of a fast decolorization performance. Therefore, light-induced oxidation of tungsten exploration is still a long way to go discolored material.

Most scholars are detected by UV spectroscopy after light irradiation discoloration of materials, but the method can not measure the discoloration process in a short time, so we discoloration of the mechanism and process of its difficult to accurately grasp. Electrons produced until 1993 using a highly sensitive technique to detect TR tungsten oxide in a few seconds after the light discoloration, gives the decolorization tungsten oxide reversible process is the conclusion at the same time, and proposed rate and colored light when empty Point of view related to the number. In addition, by EsR, XPS and other means can also check the process side of the tungsten oxide discoloration, but the two instruments are very expensive, and therefore can not serve as a common means of representation.

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