What are the technical principles and characteristics behind UVC led?

发布时间：2021-10-26 13:18 来源：萤光创新

Affected by the epidemic, the development of UV LED industry has accelerated, especially the UVC led with killing function has realized market education in a short time. More and more enterprises are configuring related industries, and the application field of UVC LED is becoming more and more extensive. It is generally used for sterilization and disinfection of surface, air and water, including:

Mainstream application of UVC LED

With such a wide range of applications, what is the principle and characteristics of UVC led?

UVC LED lighting and killing principle

Based on the principle of semiconductor luminescence, the light source in UVC band is manufactured. The band gap width of three or five groups of semiconductor materials such as aluminum nitride, gallium nitride or indium gallium nitrogen falls between the blue and ultraviolet bands. Their electrons are combined with the holes in the valence band. The energy obtained during the combination is released. Changing the material proportion can release ultraviolet and visible light in different bands.

Relationship between different Al in GA n material ratios and band gap width and emission wavelength

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 very strong destructive power. It can cut off the chemical links of most compounds, destroy the RNA and DNA of cells, and make them die or lose their reproductive ability immediately.

Characteristics of UVC LED

1. Electrical characteristics: in current controlled devices, the small change of forward conduction voltage will cause great change of forward current (exponential level), the reverse leakage current is very small, and there is reverse breakdown voltage. The positive voltage of UVC led decreases with the increase of temperature, and has a negative temperature coefficient. Part of the power consumed by UVC LED will be converted into light energy, and the rest will be converted into heat energy.

2. Optical characteristics: UVC LED provides monochromatic light with large half width. Since the semiconductor energy gap decreases with the increase of temperature, the peak wavelength emitted by UVC LED will increase with the increase of temperature, that is, the spectral red shift. The luminous brightness of UVC LED is directly proportional to the forward current. When the current increases, the luminous brightness also increases approximately. In addition, the luminous brightness is also related to the ambient temperature. The higher the temperature, the lower the recombination efficiency and the lower the luminous intensity.

3. Thermal characteristics: under low current, the temperature rise of UVC LED is not obvious. If the ambient temperature is high, the main wavelength of UVC LED will shift red, the brightness will decrease, and the luminous uniformity and consistency will become worse, so the heat dissipation design is very important.

UVC can penetrate the cell membrane and nucleus in organisms, destroy the molecular structure of DNA or RNA in microbial body cells, and cause growth cell death or regenerative cell death, so as to achieve the role of sterilization and disinfection.

The killing time of deep UV uvc-led is generally more than ten seconds to three or five minutes, which can eliminate a variety of common pathogenic bacteria. Moreover, due to the small volume and high daily portability of uvc-led beads, it is also convenient for the use of products. With the development of UVC LED technology becoming more and more mature, the market has higher and higher awareness and acceptance of UVC led, and more and more conventional and novel applications will adopt UVC LED technology to convey the signal that the industry is booming.

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.