Amorphous Tungsten Oxide Thin Film

It has been reported that amorphous tungsten oxide thin film has good optical absorption to shield near-infrared rays, thereby reducing room temperature in hot summer and saving powder rate for cooling the room by using air conditioners or fans. Some experts have investigated the electrochromic color centers of amorphous tungsten oxide thin film by the Raman scattering method.

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And the results showed that amorphous tungsten trioxide film is shown to be composed of a spatial network of tightly bound (WO6) n·mH2O clusters with a large number of terminal oxygen W=O and W-O-W bonds between clusters. The injected electrons in an amorphous tungsten trioxide film are localized in the tungsten 5d orbitals in an axially distorted octahedron, as is shown by ESR analysis. The optical absorption of a colored amorphous tungsten trioxide film, as has previously been proposed, can be satisfactorily described by an intervalence charge-transfer transition between localized W5+ and W6+ states.

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