- Improving the thermal management of UVC LEDs
- COMPOUND SEMICONDUCTOR
OVER THE YEARS mankind has come up with a variety of methods for sterilising objects, surfaces and consumables; from heating, to the use of chemicals, to dehydration. It has long been understood that natural sunlight can act as a sterilising agent, albeit a relatively weak one. Experiments in the late 19th century demonstrated that water left for a long period in sufficiently direct sunlight would remain free of bacterial growth. It was later discovered that the cause of this sterilising effect was the ultraviolet C-band (UVC) light present in natural sunlight. Today we can generate UVC artificially, and with a much greater intensity than is present in ordinary sunlight. Such UVC-emitting devices can provide a highly effective means of sterilising different materials. All UVC disinfection devices, regardless of their size or specific technology, work on the same basic principle: UVC devices emit light in the ‘germicidal range’ of 200 nm to 280 nm, a spectral domain that literally ‘breaks apart’ the genomes of bacteria, rendering the bacteria inert and therefore sterilising any surface the UVC light irradiates.