Tungsten bronze for preparing near infrared absorbing material refers to a class of tungsten bronze compounds. It may be cesium tungsten bronze, which has been widely used in many fields, such as energy-saving window, biothermotherapy to ablate cancer cells, military stealth coating, and optical anti-counterfeiting, etc.

Tungsten bronze, such as cesium tungsten bronze, is often used to make a transparent heat insulation dispersion. And the prepared dispersion has the characteristics of high conductivity, high near-infrared shielding effect, high transparency, electrochromic property, photochromic property, light-to-heat conversion ability, photocatalytic property and dispersion stability.

Tungsten bronze complex with the formula of M1xM2yWOz is a near infrared shielding material that developed for energy efficiency and carbon dioxide reduction. Wherein, M1 is Li, or Na; and, M2 is K, Rb, or Cs. The experts provide a method for fabricating such a near infrared shielding material of tungsten bronze complex, wherein the method includes:

The infrared absorption material can be a tungsten bronze complex with the formula of M1xM2yWOz, wherein 0.6≦x≦0.8, 0.2≦y≦0.33, 0.8≦x+y<1, and 2≦z≦3; M1 is Li, or Na; and, M2 is K, Rb, or Cs. In particular, the tungsten bronze complex consists of a cubic tungsten bronze (CTB) and a hexagonal tungsten bronze (HTB). Wherein, the molar ratio between the cubic tungsten bronze and the hexagonal tungsten bronze is between 0.995:99.005 and 5.005:94.995. The infrared absorption material can be applied in a thermal insulation structure to meet the requirements of high transmittance and high thermal insulation.