UV-C LED triples radiant flux density for Covid-19 disinfection

Technology News |
By Nick Flaherty

Nichia in Japan has launched a high radiant flux density UV-C LED that can help target the inactivation and sterilization of various bacteria and viruses, including variants of Covid-19.

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

The higher flux density allows manufacturers to provide more virucidal power in applications such as water purification, near-surface sterilization, and air purification systems to inactivate bacteria and viruses.

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The 280nm UV light is hazardous to people, so the LEDs are installed inside equipment for the sterilization.

Using the 280nm LEDs, Hitachi Zosen and Professor Jiro Yasuda of the National Research Center for the Control and Prevention of Infectious Diseases/Institute of Tropical Medicine, Nagasaki University conducted various inactivation experiments on airborne microdroplets of a coronavirus variant. In a one-pass test, results confirmed that a dosage of ~1mJ/cm2 reduced the infection titer to less than 1/10 (virus survival rate 4.5 percent), indicating effective results against these new coronaviruses.

As the inactivation mechanism of deep ultraviolet light is based on direct denaturation of viral RNA, equally effective results can be expected against variants including the currently rampant Delta strain.

The NCSU434B represents a significant upgrade in radiant flux density versus its predecessor, the NCSU334B. Mass production of the new 434B UV-C LED has commenced, with immediate sampling and mass production volume available.

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