After the great increase in sterilization demand, why is UV LED on fire?
发布时间：2021-12-07 14:32
来源：萤光创新
Under the catalysis of the epidemic, with the surge of consumer demand for sterilization and disinfection, the UV LED industry is developing rapidly. Mankind needs effective disinfection and sterilization means to safeguard life safety!
According to the difference of UV energy, it is divided into three common band types:
UVA: also known as long wave ultraviolet, with a wavelength of 320-400nm. It has the strongest ability to penetrate the atmosphere and the least destructive. Time accumulation will cause damage to organisms.
UVB: also known as UVB, with a wavelength of 280-320nm, it will be largely absorbed by the ozone layer and have a profound impact on the growth and health of organisms.
UVC: also known as short wave ultraviolet, with a wavelength of 200-285nm. It has the worst penetration into the atmosphere and is the most destructive to organisms. It can burn the skin in a short time, and skin cancer can be caused by long-term or high-intensity irradiation.
According to the light quantum theory, the shorter the wavelength, the stronger the energy, and the greater the damage to organisms. Short wave ultraviolet light even has super destructive power, can cut off the chemical links of most compounds, and can also destroy the RNA and DNA of cells, making them die or lose their reproductive ability immediately.
The spectrum emitted by the sun to the earth originally contained UV band, but due to the absorption of the earth's atmosphere, especially the ozone layer blocked 97 ~ 99% of UV radiation, most UV could not enter the earth's biosphere, and all things could survive and reproduce.
Among them, the use of UVC is one of the ways of disinfection and sterilization. This is because UVC can destroy the molecular structure of DNA or RNA in microbial body cells, resulting in growth cell death and / or regenerative cell death, so as to achieve the effect of sterilization and disinfection. The killing time of UVC for most bacteria and viruses is less than 1 second. Relatively speaking, UVA and UVB can also be sterilized, but the efficiency is not as high as UVC.
At present, deep ultraviolet light sources include mercury lamp and UV LED. However, mercury lamp has some defects, such as inconvenient to carry, need to preheat, mercury toxicity and fragile. At present, UV LED is the only product that can emit deep ultraviolet radiation with high efficiency, energy saving, safety, reliability and environmental protection. It is also the only UV light source product that can replace mercury lamps after the United Nations signed the Minamata convention banning mercury containing products.
However, at present, UVC LED has not completely replaced mercury lamp. Among the UV LED technologies, the most mature is UVA led, which is mainly used in UV glue curing, UV printing and UV exposure. Compared with the mature UVA led, UVC LED chip has high manufacturing difficulty and low luminous efficiency. At present, it is still in the development stage.
At present, although the manufacturing process of UVC LED chip is less difficult than IC, it is more difficult than visible LED. It can be said that the shorter the wavelength, the higher the technical requirements. The whole structure of UVC adopts AlGaN materials which are difficult to grow and have low luminous efficiency, but there can be no gallium nitride and indium gallium nitride materials. Because these two materials will absorb ultraviolet light, the luminous efficiency of UVC LED will be much lower.
Qingdao fluorescent Innovation Technology Co., Ltd. has a professional postdoctoral team, focusing on the research of ultraviolet sterilization application. After years of deep cultivation in the ultraviolet industry, the company has obtained a number of national invention and utility model patents. At present, a number of sterilization module products have been put into the market. For more details, you can browse the company website www.qdyingguang.com, contact the company for WeChat's official account.
Keywords: UVC, UVC led, deep ultraviolet, ultraviolet sterilization, ultraviolet disinfection, deep ultraviolet LED, water sterilization, water disinfection, air sterilization, air purification, flowing water sterilization, static water sterilization
