Tungsten Oxide Photochromic Detection

Study tungsten oxide photochromic almost half a century, but uncertainty and change color to characterize the unity of the light source chosen their development will be very slow. 1973 Deb use Urbach rule: K (v, T) = K₀exp [-B (E^Ω_g-hv) / KT]. Where hv is radiant energy, B and K₀ is a constant characteristic of the material. When the light energy is more than 3.5eV, the (Khv) ^{L / 2} and hv will be a linear relationship. That K is proportional to (hv-E^Ω_g) ² / hv. Accordingly reasoning greenhouse condition the energy band gap is3.25eV. Because the selection is a suitable light source, it is the key to discoloration. Currently there are reports of high pressure mercury lamp light source and two high-pressure xenon lamps. However, the use of light source wattage vary, mercury has 500w, 400w, 250w, 150w and the like. Xenon lamps have 500w, 200w, 150w, 75w, etc. 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 standpoint of photochromic material when under sunlight sunglasses manufacturers have been the most demand, high-band color and Zeng field of information needed for long-term stable material, and display material aspect requires fast coloring and bleaching properties.

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