"Nanjing epidemic, Shenyang epidemic, Zhongshan epidemic", the recent recurrence of the new crown epidemic, in addition to daily protection, individuals can choose some UV-LED sterilization equipment to kill the new crown virus (new crown virus can be Spread through air sterilization), such as air sterilization appliances.
“UV LED Wind Direction” learned that the experiment has verified that the use of UV LED technology can kill airborne viruses. For example, Seoul’s Violeds technology can kill 99.9% of new coronaviruses within 30 seconds (click for details). In addition, the results of the air disinfection test conducted jointly with KTL (Korea Industrial Technology Laboratory) showed that the Violeds technology can disinfect a space of 60㎥ within 30 minutes with a rate of 99.0%.
Another example is that on June 22, G-Smatt Japan and Nara Medical University in Japan announced the results of the inactivation effect of visible light 405nm on the new coronavirus (SARS-CoV-2) (click for details), and the experimental data verified that 405nm was within 5 minutes The effective rate of inactivating the new coronavirus is about 70%.
As another example, on June 11th, Asahi Kasei cooperated with Nara Medical University (click for details) to verify that "226nm UVC LED" can quickly inactivate the new coronavirus with little impact on animal cells.
It can be seen from the three major experiments that UV LED inactivation of the new crown in the air is well-documented. It happens that air sterilization is currently the most widely used method of UV-LED in the market, and it is also one of the promising directions for enterprises!
According to the "UV LED Wind Direction", it is understood that air sterilization is mainly used in three places, involving cars, homes, and public places, covering small spaces to large spaces! However, UV LED air disinfection applications that can effectively sterilize and disinfect require certain conditions. The key lies in the correct wavelength, dose and time. What are the differences between the products used in these three places?
Car space
At present, more portable air purifiers and car air conditioners are used for car space. Portable air-conditioning purifiers for vehicles such as Nitride Semiconductor launched the UV deodorizer LEDPURE (Elidi Pure) AH2 (EelcoutiPure). The light output of the LED has been increased by about 4 times and is effective against viruses.
It is equipped with three UV-LEDs with a wavelength of 365nm, which decompose the source of ions by irradiating a photocatalyst, and a deep ultraviolet UV-LED with a wavelength of 275nm to disinfect viruses caught on the surface of the HEPA filter. Although the number of installations of various filters and UV-LEDs is the same, the light output of deep ultraviolet LEDs is four times that of conventional LEDs and is effective against bacteria and viruses, thereby significantly improving sterilization performance.
Car air conditioners, such as the first built-in deep ultraviolet "antivirus" car air conditioner developed by SAIC, use the UVC optical antivirus system mounted in the car air conditioner to effectively destroy molecules through the photochemical action of UVC on bacteria, viruses and other microorganisms. The structure can cause growth and regenerative cell death. It can not only effectively adsorb and block the particulate matter in the air, but also further "eliminate" bacteria and viruses in the air-conditioning filter. It is worth mentioning that due to the extremely short UVC wavelength, extremely weak penetration, and no ozone generation, and the use of a built-in black box layout of the car air conditioner, the optical antivirus system will not cause adverse effects on the environment and the human body during operation. .
Home space
In the home space market, what we have learned at present is mainly the use of air conditioners and home air purifiers. The air purifier is like the KJ210G-T32 air purifier of the United States. This air purifier is loaded with independent patented ultraviolet sterilization technology. The purifier has a built-in UV LED light, which helps to remove bacteria and viruses that circulate into the air purifier. It also prevents the growth of mold and makes the air purifier more effective in sterilization, disinfection and mold prevention. Midea KJ210G-T32 is also equipped with a photocatalyst catalytic net. Under the UV ultraviolet rays inside the machine, it can have a more powerful and efficient action of removing fungi and bacteria, so that families with pets do not need to worry too much about pets bringing bacteria in the air. problem.
The air conditioner such as Mijia Fresh Air Conditioner Premium Edition is equipped with a UVC deep ultraviolet sterilization system, built-in 3 UVC LED lights, with the help of deep ultraviolet UVC sterilization technology, it can quickly kill bacteria and viruses, and efficiently eliminate E. coli, staphylococcus albino, and golden grapes. Cocci and H1N1 influenza. At the same time, with the high-volume circulation characteristics of the air-conditioning cross-flow fan, the indoor air can be continuously circulated and transported to the UVC ultraviolet sterilization place for sterilization, thereby ensuring the health and cleanness of the internal air in the entire indoor space.
Public places
UV LED technology can not only be applied to air purifiers and air conditioners, but is different from car and home environments. In large public places such as airports and schools with too many people and denser, disinfection robots are used. High-power light source, such as the "intelligent temperature measurement and disinfection robot" of Guangpu Electronics.
This robot can detect the body temperature of nearby people in real time; when no one is close, it will kill the air and objects around the robot; when people are close, the external ultraviolet rays are turned off and the air disinfection device is activated to avoid harm to the human body and realize the coexistence of man and machine. , Eliminate the surrounding peculiar smell, kill bacteria and viruses.
From the perspective of three environmental applications, the UV LED air disinfection application that can effectively sterilize and disinfect requires certain conditions. The key lies in the correct wavelength and dosage. The higher the intensity, the shorter the sterilization time. Therefore, to achieve the level of spike, the UVC-LED light intensity must be increased, and the UV lethal dose for different bacteria or viruses and other microorganisms is also different.
Summary: In response to the rapid market changes in the UV LED industry, many companies have begun to move toward the blue ocean of niche markets---air sterilization applications, including Osram, Xiaomi, Huawei, Daikin and other upstream and downstream companies are investing in development. However, air disinfection varies from small spaces to large spaces, and the light intensity, required irradiation time, and sterilization efficiency of different products still depend on their respective designs.
