Nowadays, very a few people doubt about the effectiveness of UVC light in eliminating fungi, viruses and bacteria in the air and on object surfaces. Actually, this sterilization technique has been widely tested and applied over a century. The COVID-19 pandemic has re-ignited the public’s interest and demand on it.
The main problem we encounter in these devises is that their source of radiation usually is costly, besides, it requires high powers, which appears to be large in their volume. However, its lifespan is relatively short.
That is why the new studies focus on developing LED UVC devices that could be moved or carried easily from one place to the other and on developing those could be more durable, efficient and environmentally friendly.
Nevertheless, the development of this technology still needs overcoming several limitations. One of them is about radiant energy, as UVC LEDs only emit a range of radiation between 100 and 280nm, proving to be very low in EQE, around 1%.
This means to kill viruses, a high performance UVC LED that is able to emit a high density of UV light would be necessary. Something is currently very limited for LED light.
It makes us to question about devices that use LED chips to sterilize. Their effectiveness is very limited, at least for the moment.
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