Near Infrared Shielding Material of W18O49

With good light absorbing ability and thermal insulation performance, near infrared shielding material of W₁₈O₄₉ is widely used in the windows of modern buildings and automobiles. Its application is of great importance to energy saving and environmental protection.

Near-infrared absorption film is a kind of film which has high visible light transmissivity and can shield near-infrared light at the same time. This kind of film, which can effectively modulate the solar energy intake through the window glass, has great energy saving potential. In order to obtain high-quality near-infrared absorption film, it is necessary to prepare near infrared shielding material with good performance.

At present, two kinds of near infrared shielding materials have been developed.

One is traditional transparent conductive semiconductor materials, including tin doped indium oxide, antimony doped tin oxide and aluminum doped zinc oxide. They have high visible light transmissivity and good thermal insulation property. And they can shield near-infrared light. However, this kind of materials can only shield near-infrared light with a wavelength greater than 1500 nm. And the preparation cost is high. Therefore, they can be applied on a large scale.

The other is tungsten-based semiconductor materials, including tungsten oxide (WO_3-x) and tungsten bronze (M_xWo₃). They have high visible light transmissivity. And they can shield all-band near-infrared light. Therefore, this kind of materials can be widely used in the preparation of near-infrared absorption film.

As a kind of tungsten-based semiconductor material, near infrared shielding material of W₁₈O₄₉ is the most representative one. It not only has good light absorbing performance, but also has good photothermal conversion capability. Therefore, this kind of material has broad application prospects in the windows of modern buildings and automobiles. Near infrared shielding material of W₁₈O₄₉ has good thermal insulation property. Its application is of great importance to energy saving and environmental protection.

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