According to a survey, there are 120,000 bacteria per square centimeter in the mobile phone. According to this calculation, the entire mobile phone has at least a million bacteria. This number is enough to make the bacteria team on the toilet seat ashamed. In 2011, British researchers concluded that the bacterial content of a mobile phone may be 18 times that of the flush handle of a men's toilet.
In the era of the epidemic, hands cannot be washed frequently; but in the new era, the machine does not leave your hands, and your brain replenishes your hands. When you wash your hands and the unwashed mobile phone returns to your hands... the result can be imagined.
So, is there any way to disinfect cell phones that are full of bacteria?
From the perspective of traditional and common disinfection technology, the mobile phone is obviously unable to handle the disinfection with high temperature and disinfectant. Alcohol wiping, soap cleaning, etc. can damage the anti-oil screen coating, accelerate the aging of the screen, and make the screen worse. Consequences such as plaques, blurred screens, discoloration, etc. appear.
During the epidemic, the more high-tech physical disinfection method-UV LED disinfection, is becoming a new way of cell phone disinfection-washing hands and killing; charging and killing; working and killing... …
The following are selected cases, you can understand at a glance how UV LED kills service for mobile phones.
Case 1: Deep UV LED washstand launched by Toyoda Gosei + WOTA
The internationally renowned company Toyoda Gosei and WOTA have developed the UVC LED WOSH portable circulating water washstand. The WOSH portable washbasin can purify and reuse water many times because it can be used outdoors and other places with limited water supply.
The biggest highlight of this portable washbasin is: the WOSH portable washbasin is sterilized with deep ultraviolet and chlorine disinfectant. After filtering the water, it is irradiated with deep ultraviolet LED and disinfected with chlorine to achieve the goal of completely eliminating the virus. Because even if you wash your hands, touching the dirty smartphone again may immediately contaminate your clean hands. In response to this, the product has a 20-second deep ultraviolet LED exposure function, which can clean the smartphone before washing hands.
It is understood that the deep ultraviolet LED module of the WOSH portable washbasin is designed according to the use environment (such as high humidity conditions). The module uses high-power deep-ultraviolet LEDs with emission wavelength of 275/280nm and output power of 40mW (IF = 350mA), which can effectively inactivate viruses and fungi and prevent their reproduction. The heat dissipation design of the module supports up to Ta = 40°C, adopts a sealed structure, does not require moisture-proof and waterproof design, and can protect deep-ultraviolet LEDs under high humidity conditions.
Case 2: German Research Institute launched a UVC LED solution for rapid disinfection of mobile phones
Researchers at the Fraunhofer Institute in Germany have devised an innovative smartphone disinfection solution that ensures that these mobile phone devices can remove bacteria and viruses, such as SARS-CoV-2, within seconds. Replace expensive and unwise chemicals with UVC LED light.
From the outside, the device is similar to an ordinary microwave oven, and UVC LEDs are used inside, and their wavelength is 269 nm. The device has a total of two independent UVC LED modules. There are 10 UVC LEDs built in each of the top and bottom, and each UVC LED has an output of 100mW, so the total emission power is 2W. This can ensure that the exposure level of 800 J/m² is reached in just a few seconds, thereby effectively eliminating bacteria and viruses.
This solution can not only use light to sterilize smartphones, but also use an NFC reader to identify them independently, and use the sensor that stores the sensor to record the applied dose. In this way, each sterilization process can be verified and clearly attributed to the corresponding equipment.
The prototype was exhibited at IFAT (the world's largest trade fair for water, sewage, waste and raw material management) held in Munich, Germany in September 2020.
