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. More details, please visit: http://cesium-tungsten-bronze.com/index.html
The infrared absorption material of tungsten bronze complex such as a thermal isolation film is generally formed on the window glass of buildings or vehicles to achieve energy saving and carbon reduction. Due to their thermal insulation characteristics, metal oxides have been widely used in the thermal insulation film. Accordingly, there is a need to develop a thermal insulation material with a high visible light transmittance and a high infrared radiation absorption efficiency. And tungsten bronze complex is developed to solve the above mentioned problems.
