Tungsten Oxide Nanomaterial: Photoluminescence

What is the relationship between tungsten oxide nanomaterial and photoluminescence? It is reported that nano particle size tungsten oxide has photoluminescence properties. And there is strong photoluminescence in nanostructured crystalline tungsten oxide thin films at room temperature.

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According to the experts, by controlling experimental conditions, crystalline tungsten oxide thin films composed of different nanostructures can be obtained through thermal evaporation of tungsten wire. An UV emission at 355 nm and a blue emission at 435 nm are observed on the prepared nanostructured crystalline thin films. These emission peaks can be attributed to band–band transition and localized states induced by the presence of oxygen vacancies or defects in the nanostructure. Since no strong photoluminescence can be detected in bulk phase material, it is helpful for understanding the quantum-confinement effect on the band structure of this kind of indirect-band gap semiconductors and the photoluminescence process in them.

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