Understand the four sterilization bands of 222 / 275 / 253 / 405nm
2022-01-20
Recently, we often mention the ultraviolet sterilization bands of 254nm, 275nm, 222nm and 405nm. In order to let friends know these bands better, let's talk about this topic today.
254NM
This band is common in ultraviolet mercury lamp. It uses low-pressure mercury vapor to radiate ultraviolet rays during discharge. Low-pressure mercury vapor mainly produces 254 nm and 185 nm ultraviolet rays. The characteristic wavelength of mercury lamp for sterilization is 253.7 nm, and its radiation power reaches the order of watt (W). It is widely used in large-area environment and has good sterilization effect.
Ultraviolet mercury lamp was once considered as the best choice for disinfection and sterilization. Now most sterilization lamps on the market are still 254nm mercury lamps. Compared with the UV LED lamp, it has the disadvantages of large size, high energy consumption, long preheating time and mercury content. Under the influence of the international Minamata convention, it will withdraw from the historical stage in a short time. In the future, the deep UV LED will have huge application space.
275NM
Deep UV LED is different from mercury lamp. The characteristic wavelength of mainstream products of deep UV LED is 275-280nm. 253.7nm and 275nm are on both sides of the peak wavelength of DNA absorption of 265nm respectively, with almost the same DNA absorption value. Therefore, the sterilization efficiency is almost the same.
UV LED has the advantages of small volume, low power consumption, instant lighting, etc. it can close the UV in a small space, easy to prevent and control the UV leakage, can achieve man-machine coexistence, and has obvious advantages in practical application. With the progress of UV LED technology, UVC led, which is smaller and smaller, stronger and stronger, non-toxic, longer service life, more energy-saving, and allows more switching times, has become a new choice for sterilization light source.
222NM
Researchers from several well-known foreign universities and institutions found that the 222 nm ultraviolet light could not penetrate the cuticle of human skin, was harmless to human body, and had the same sterilization effect as the traditional ultraviolet lamp. This news attracted the market's reports and attention. In fact, this work is still in the experimental research stage, and there is still a long way to go from industrial application.
405NM
405nm violet light (which can also be included in the UVA range) has a certain bactericidal ability. The researchers used a 18150mw 405nm light source to irradiate e E. coli at a distance of 50cm for 9 hours, and achieved a bactericidal efficiency of 99.9%. This method has low sterilization efficiency, high light source power and difficult heat dissipation, which greatly limits its wide application.
Based on the above simple analysis of bands, we also have a basic understanding of these bands. Ultraviolet sterilization has the excellent characteristics of broad spectrum, high efficiency and environmental protection. It is the most suitable sterilization method for daily life.
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, please visit the company's website at www.qdyingguang.com Com contact the company for the official account of WeChat.
