Tungsten Oxides Colours (III)

Details: Category: Tungsten Information; Published on Tuesday, 03 February 2015 19:32

The colours of the tungsten oxides are a result of the fact that the absorption and emission of photons (light) are dependent on wavelength. If the material has a low reflectivity at the short wavelength end of the spectrum (460-480 nm) it appears yellow to orange, because only the green and yellow part of the light is reflected. If it has a low reflectivity at the long wavelength end of the spectrum (550-700 nm), it appears blue or violet. If all components of the white light are absorbed and not re-emitted, the material appears black.

Colours can significantly change with different valence states within an oxide structure, although the parent structure of differently coloured oxides basically appears the same (due to changes in absorption and reflection and/or transmission). Inherent colours also change with the size of the particles, and the colours of powders therefore can significantly differ from those of single crystals. Thin films of tungsten trioxide are even transparent, but can be readily coloured by impurities which are used today for electronic devices.

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