Cs Doped Tungsten Bronze Applied for Near Infrared Light Shielding Film

Cs doped tungsten bronze may be prepared into a near infrared light shielding film, which contains fine particles for absorbing infrared light. You know, windows of buildings and vehicles have been constituted with transparent glass plates or resin plates so that sunlight can be transmitted. However, the sunlight contains ultraviolet light and near infrared light in addition to visible light. Near infrared light having wavelengths of 780 to 2,100 nm is called heat rays and causes elevation of the temperature at the inside when the light is transmitted through the windows of buildings and vehicles.

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To decrease the elevation of the temperature at the inside and to save energy, means for providing the function of shielding from heat rays, which shield the windows from heat rays while visible light is sufficiently transmitted and suppress the elevation of the temperature at the inside while brightness is maintained, have been applied to the various types of windows described above. For example, a near infrared light shielding film obtained by forming a transparent thin film of Cs doped tungsten bronze nano particles on the surface of a substrate is usually attached to a window.

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