Recent discoveries in Physics: While it has long been known that ultraviolet (UV) light can help kill disease-causing pathogens, the COVID 19 pandemic has put a spotlight on how these technologies can rid environments of germs. However, the excimer lamps and LEDs that can directly emit light in the required deep-UV wavelengths generally have low efficiency or suffer from short lifetimes. Moreover, UV light of the wrong wavelength can actually be harmful to human cells.
To understand the discovery above we talked about the absorbtion and emission spectrum.