Why does the color-changing glass change color?

[China Glass Net] The color changing glass is made by adding a light color material to the glass raw material. This material has two different molecular or electronic structural states. There are two different absorption coefficients in the visible region. Under the action of light, it can change from one structure to another, resulting in a reversible change in color. So, why does the color-changing glass change color? Let's take a look at it.

Why does the color-changing glass change color? 1. The structure of the color-changing glass

The color is changed under irradiation of light of a suitable wavelength, and the glass of its original color is restored when the light source is removed. Also known as photochromic glass or light color glass. The color-changing glass is made by adding a photochromic material to the glass raw material. This material has two different molecular or electronic structural states. There are two different absorption coefficients in the visible region. Under the action of light, it can change from one structure to another, resulting in reversible changes in color. Common The silver halide-containing color-changing glass is prepared by adding a small amount of silver halide (AgX) as a sensitizer to the sodium aluminum borate glass, adding a trace amount of copper and cadmium ions as a sensitizer, melting the glass into a glass, and heat-treating at a suitable temperature to make The silver halide is obtained by being aggregated into fine particles.

2, the characteristics of color-changing glass

When it is irradiated by ultraviolet or visible light short-wave, silver ions are reduced to silver atoms, and some silver atoms are aggregated into a colloid to develop color of the glass; after the illumination is stopped, under the irradiation of heat radiation or long-wave light (red or infrared), the silver atom It turns into silver ions and fades. The characteristic of silver halide color-changing glass is that it is not easy to be fatigued. After 300,000 times of light and dark changes, it still does not fail. It is a commonly used material for making color-changing glasses. Color-changing glass can also be used for information storage and display, image conversion, light intensity control and adjustment.

3. The basic principle of color changing glass

A glass containing silver bromide (or silver chloride) and a trace amount of copper oxide is a color-changing glass. When exposed to sunlight or ultraviolet light, silver bromide therein decomposes to produce silver atoms (AgBr == Ag + Br). Silver atoms can attract visible light. When silver atoms are concentrated to a certain amount, most of the light that is incident on the glass is absorbed. The original colorless and transparent glass will turn grayish black. When the discolored glass is placed in the dark, under the catalysis of copper oxide, the silver atom and the bromine atom combine to form silver bromide (Ag+Br==AgBr) because the silver ions do not absorb visible light, so The glass will turn into colorless and transparent. This is the basic principle of discoloration of color changing glass.

4, the function of the color changing glass

Making window glass with color-changing glass can make the light transmitted through the sun shine softly and have a cool feeling. Color-changing glass can also be used to make sunglasses.

The above is the knowledge about why the color-changing glass that we introduced today will change color. I hope that our introduction can help you.

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