UV disinfection devices have already been created with fluorescent lighting technology. These low or medium pressure mercury lamps emit a wavelength of about 254 nm. Mercury lamps have been used f. ex. as disinfection systems in water treatment plants. Adjusting and controlling fluorescent lamps is extremely difficult, and at the end of its working life, the fluorescent lamp turns into hazardous waste. UV-LED technology – newer than ever! The UV light produced by LED technology can be adjusted very precisely in terms of intensity, wavelength, and ignition and extinguishing. The energy demand for LED technology is remarkably low and the system doesn’t produce so-called AC power at all. LED technology also enables the new kind of designing and planning of disinfection products and entirely new applications. UVC-LED disinfection is the future of today!
The UVB and UVC light kill the microbes. The ozone layer prevents UVB and UVC light from entering the ground. For this reason microbes don’t withstand these frequencies of light. Disinfection is based on UVC light that destroys the DNA chains of microbes. Powerful UV-LED lights also destroy the so-called “super bacteria”!
Disinfection treatment with UVC-LED technology is a new method with a very wide potential for different applications. The method makes it possible to handle air, various solid surfaces and materials, as well as clear and murky liquids.
In the exposure unit the subject is illuminated with a suitable UVC light wavelength and illumination time to achieve the desired results. UVC light works practically against all microorganisms. UVC light changes the biological properties of cells by breaking down the structure of the DNA and affecting the target organism's different properties according to the set values.
Also bacteria resistant to antibiotics respond to UV light, which allows for example the controlling of bacterial epidemics in hospitals with the help of disinfection of indoor air, working spaces and equipment. This can slow down and limit the spreading.
The logarithmic reduction of Escherichia coli (cfu/cm2) on the front surface of the mobile device (A=44.5 cm2) due to the impact of the UV Led during 30 minutes. The average impact of the drainage was subtracted from the reductions.
Figure 1. The impact of the UV-Led treatment on E. coli on the front and back surface of the phone. The maximum logarithmic reduction on the front side 3.3 and on the back side 4.4.