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Future development trend of uv sterilized led lamp beads

Publish:Shenzhen Teng Jie Optoelectronics Technology Co., Ltd.  Time:2022-12-17
 Ultraviolet sterilization of led lamp beads is not particularly new, so far, it has a history of nearly a hundred years. As early as 1903, Niels Ryberg Finsen used ultraviolet light to treat skin diseases, published relevant monographs, and won the Nobel Prize in Physiology and Medicine for a long time.

Traditional ultraviolet light sources include low/medium pressure mercury lamp, microwave electrodeless mercury lamp, etc. The new ultraviolet light source is mainly based on wide band gap semiconductor materials. Compared with traditional light sources, it is a cold light source and a future development trend of ultraviolet light sources.

By adjusting the AI component in the AlGaN material, the light emission wavelength of the led lamp bead can be adjusted at any time between 200-365nm, covering the broad band from UV-A to UV-C. Compared with the ultraviolet light source of traditional mercury lamp, this is the advantage of AlGaN semiconductor material as the ultraviolet LED lamp bead light source.

Compared with traditional UV light source, AlGaN based UV LED lamp beads also have the advantages of small size, portability, environmental protection and safety, and easy design. A variety of light source designs can be realized. In addition, the most important advantage of UV LED lamp beads is that they do not use mercury materials and are mercury free. According to Minamata Convention, from 2020, the contracting parties have prohibited the production and export of mercury containing products. Of course, mercury lamp will not be banned at once. At present, ultraviolet LED lamp beads cannot completely replace mercury lamp in terms of luminous efficiency. But in the long run, with the gradual improvement of the performance of UV LED lamp beads, its luminous efficiency is expected to exceed that of mercury lamp in the future. From the perspective of environmental protection, it should be the general trend to gradually promote the use of ultraviolet LED lamp beads.

The reason why UV can effectively kill viruses and bacteria is basically to destroy DNA to sterilize. Because the photon energy of ultraviolet ray is very high, it can destroy the DNA chain of bacteria and viruses, and kill bacteria and viruses from the root.

Different band ultraviolet led lamp beads have different killing effects on bacteria and viruses. The traditional UV mercury lamp may be 253.7 or 254 nm. In fact, the most effective wave band may be more than 254 nm. According to the latest research results, the bactericidal effect of ultraviolet light may be higher near 264 nm.

Based on this principle, it can be said that the ultraviolet led lamp beads have the characteristics of broad-spectrum sterilization. Whether it is bacteria, viruses, algae, spores and other microorganisms, the killing effect is very significant and the efficiency is very high. Compared with other sterilization methods, the advantage of ultraviolet sterilization is that after irradiation, there is no need to turn off the ultraviolet, and there is no chemical process and pollution.

In order to achieve effective sterilization and disinfection, ultraviolet led lamp beads need enough energy, including enough irradiation intensity and enough time, as well as appropriate wave band. According to the wavelength, from long to short, the UV band is divided into UVA, UVB and UVC. UVC is the band with the shortest wavelength and the highest energy, and we often call it the deep UV band. In fact, the most effective way to sterilize is to use UVC led lamp beads. No matter UVA or UVC, semiconductor materials can be used to achieve the corresponding ultraviolet luminescence.
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