Ultraviolet(UV)light has been widely applied as a disinfection technology due to its advantages such as cleanliness,environmental friendliness and absence of disinfection by-products.As an emerging UV light source,germicidal UV light-emitting diodes(GUV-LED)with output wavelengths in the range of 200～300 nm offer advantages such as a wide output wavelength range and high environmental benefits.They are gaining increasing attention in the field of disinfection.This paper provides a comprehensive review of the research progress on GUV-LED light sources,disinfection mechanisms,and effectiveness:compared to low-pressure mercury lamps,the photoelectric conversion efficiency of current GUV-LED remains very limited(＜5％);nucleic acid damage(255～265 nm)and protein damage(near 280 nm)are the main inactivation mechanisms of GUV-LED;Different microorganisms exhibit varying resistance to GUV-LED,generally with viruses＞spores＞bacteria;bacteria and viruses are more susceptible to nucleic acid damage and are inactivated by GUV-LEDs near 265 and 260 nm,while spores show similar inactivation effects near 265 nm and 280 nm.This article aims to provide a reference for the research and application of LED technology in the field of disinfection.
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