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Photochemistry and light sources

Photochemistry is a science that studies the chemical changes that occur after a substance absorbs light (2000A~8000Å). Any reaction that takes place under the action of light is called a photochemical reaction. The fading of dyes, the aging of plastics and rubber, the deterioration of oils, and the photosynthesis of plants are all examples of photochemical reactions encountered in daily life. At present, photochemical reactions have been involved in the fields of paint hardening, copying technology, photoengraving, semiconductor lithography, chemical production, and pollution treatment. Photochemical reactions are inseparable from the action of light. In addition to sunlight, artificial light sources are also an indispensable energy source for photochemistry. With the development of photochemistry in my country, the development of photochemical light sources is very urgent.

Photochemical reactions mainly use ultraviolet lamps as light sources. Generally, the wavelength ranges from 120nm-480nm as the main ultraviolet light source.

Less than 200nm is vacuum ultraviolet, 200nm365nm is short-wave ultraviolet, and above 365nm is medium-wave ultraviolet.

Including UV lamps, electrodeless ultraviolet lamps, Iron lamps, LEDs, etc. (Among them, LEDs have low energy in the short-wave range and are generally not used)

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