High radiant flux density UV-C LED fights the spread of bacteria and viruses

27-09-2021 | NICHIA | Lighting Technologies

NICHIA has launched a high radiant flux density UV-C LED that can target the inactivation and sterilisation of multiple bacteria and viruses, including the new coronavirus.

The 280nm NCSU434B LED has what is claimed to be the industry’s highest power conversion efficiency for a 3.5mm x 3.5mm LED, showing a typical radiant flux of 62mW with an input power of 350mA/5.7V typical. In high-density mounting, the radiant flux per unit area is approximately three times that of traditional products.

By taking advantage of this flux density, manufacturers can pack the deep ultraviolet device into designs to maximise virucidal power. These technical characteristics can support applications including water purification, near-surface sterilisation, and air purification systems to inactivate bacteria and viruses efficiently, quickly, and cost-effectively.

Using its high-power, 280nm LED, Hitachi Zosen Corporation and Professor Jiro Yasuda of the National Research Center for the Control and Prevention of Infectious Diseases/Institute of Tropical Medicine, Nagasaki University conducted several inactivation experiments on airborne microdroplets of a new coronavirus (Alpha strain and British mutant strain). In a one-pass test, results verified that a dosage of ~1mJ/cm2 decreased the infection titer to less than 1/10 (virus survival rate 4.5%), showing positive and effective results against these new coronaviruses.

Professor Yasuda commented that since the inactivation mechanism of deep ultraviolet light is based on direct denaturation of viral RNA, equally effective results may be expected against new mutant coronavirus strains beyond the British strain, including the currently rampant Delta strain.

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