Tungsten trioxide (WO3) absorbs part of the light in the visible range. The specific absorption characteristics depend on factors such as the crystal structure, purity and thickness of tungsten trioxide.
The energy band structure of tungsten trioxide makes it have a certain absorption capacity for visible light. Its bandgap is typically between 2.5 and 3.0 electron volts (eV), meaning it absorbs strongly high-energy ultraviolet and blue light and weakly absorbs low-energy yellow and red light. In the visible light range, tungsten trioxide usually absorbs a part of the light and converts its energy into electronic excitation or heat energy. This leads to a decrease in the visible light transmittance of tungsten trioxide, resulting in lower transparency. The degree of absorption depends on factors such as the wavelength of the light, the angle of incidence, the purity and thickness of the material.
By controlling the preparation method and material parameters of tungsten trioxide, its absorption characteristics can be adjusted. For example, preparing a thinner tungsten trioxide film or doping can change its absorption characteristics, thereby enhancing or weakening the absorption of visible light. Although tungsten trioxide absorbs some light in the visible range, its absorption properties can still be tuned through material processing and optimization to meet specific application needs.
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