A low-emissivity film

Abstract

The invention discloses a low-emissivity film. The low-emissivity film comprises a substrate, a single silver layer and a periodical multi-layer film, wherein the single silver layer covers the substrate, is composed of two protective layers and an Ag film, and has the thickness of 29nm-92nm; the thickness of the lower-emissivity film is 1325nm-1575.8nm; the periodical multi-layer film covers the single silver layer and is formed by alternatively overlapping a high-refractive-index material and a low-refractive-index material, and has the thickness of 1275nm-1490nm. For the low-emissivity film disclosed by the invention, the transmission of long-wavelength infrared waves and short-wavelength ultraviolet waves is inhibited by adopting a metal thin silver layer, the transmission of a visible light waveband is intensified by adopting a periodical structure, the transmissivity for visible light is 70-96%, the transmissivity for the ultraviolet wave band is reduced to be 15%, the transmissivity for 780nm-1200nm infrared wave band is reduced to be below 10%, the transmissivity for the 1200-3000 infrared wave band is reduced to be below 25%, the number of layers is obviously reduced, the cost is reduced to a great extent, and the technological process is simplified.

Description

technical field [0001] The present invention relates to a thin film structure, more specifically, to a low-radiation thin film structure. Background technique [0002] Low-Emissivity Film (Low-E Film) is a film with high reflection to infrared and ultraviolet rays and good transmittance to visible light, which can realize functions such as regulating sunlight and heat, saving energy, and improving the environment. [0003] Low-E films currently on the market are roughly divided into: Single Silver Low-E Film (Single Low-E Film), Double Silver Low-E Film (Double Low-E Film) and Periodic Multilayer Low-E Film (Photonic Crystal Low-E Film) -E Film); Among them, the visible light transmittance of the silver-based low-emissivity film is only 50% to 80%, and because the silver-based film includes a protective layer, a barrier layer, a combination layer, etc., it corresponds to different materials, different thicknesses, different The film layer with optical properties and differe...

AI Technical Summary

Problems solved by technology

[0003] Low-E films currently on the market are roughly divided into: Single Silver Low-E Film (Single Low-E Film), Double Silver Low-E Film (Double Low-E Film) and Periodic Multilayer Low-E Film (Photonic Crystal Low-E Film) -E Film); Among them, the visible light transmittance of the silver-based low-emissivity film is only 50% to 80%, and because the silver-based film includes a protective layer, a barrier layer, a combination layer, etc., it corresponds to different materials, different thicknesses, different The film layer with optical properties and different physical and chemical process parameters lead to difficulties in film manufacturing and parameter detection;

[0004] The periodic multi-layer low-emissivity film has an average UV transmittance of about 30%, an infrared transmittance of less than 10% in the wavelength range of 800nm ​​to 1200nm, and an average value of about 85% in the wavelength range of greater than 1200nm. 40 layers, large thickness; because the periodic multilayer film needs to be deposited and covered more than 30 times, the preparation process is complicated and the production cost is high

Images