Crystalline WO3 film may be used to produce a highly transparent energy-saving smart glass, which has the dings of heat insulation, ultraviolet shielding, anti-glare and explosion protection. So, do you know the energy-saving mechanism (or electrochromic mechanism) of such energy-saving glass?
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Some experts have proposed an energy level model for crystalline tungsten oxide. In the process of electrochromism, the injected electrons will first occupy the position of the lower energy conduction band, and the electrons are no longer bound to a certain point, but free carriers are formed in the band. These carriers can absorb photons from one energy state to another, and the frequency of absorbing photons is concentrated in the near-infrared band, resulting in a blue color after the tungsten oxide film is colored. Experts said that this part of research is mainly based on the theory of first principles, through the calculation of materials science to study and propose the model. However, due to the complex crystal form of crystalline tungsten oxide, there are different crystal systems ranging from simple cubic to monoclinic, orthogonal, tetragonal, and trigonal, which makes the study of energy level models very complicated.
