Nano tungsten trioxide, or nano WO3, is mainly applied for producing living room thermal insulating glass coating. Such coating is more and more well-known as it is environmentally friendly with high heat shielding performance, high transparency and high UV resistance. And more scholars are joining the study of the raw material tungsten trioxide. According to the experts, optical absorption and photoluminescence spectroscopy are useful techniques to obtain information on localized states in the band gap. However, hitherto, comparatively few photoluminescence studies have been reported on WO3.
More details, please visit:
http://www.tungsten-powder.com/tungsten-oxide.html
The experts said that the photoluminescence emission can be associated with decay of an electron from the conduction band directly back to the valence band, into a charged vacancy state (Vo 1+ or Vo 2+), or from the vacancy state (Vo 0 or Vo 1+) to the valence band. An electron can also decay non-radiatively to a localized state and then further decay by a photoluminescence process to the valence band. The transitions can occur from a thermally equilibrated state at the bottom of a potential well to a nonrelaxed state, or vice versa. And the experts relate the experimental data with possible optical and photoluminescence transitions in nanocrystalline WO3.
