SETI and Seoul Viosys Violeds Technology Demonstrated to Kill 99% of Coronavirus (SARS-CoV-2) in less than a Second

Jan. 12, 2021

SETi currently has two sample sanitation products demonstrating UV-C LED technology available for purchase at

ANSAN, South Korea – Sensor Electronic Technology, Inc. (SETi) and Seoul Viosys (KOSDAQ: 092190), the leading global providers of UV LED technology and subsidiaries of Seoul Semiconductor, announced that its Violeds technology can quickly and effectively kill 99.437% of SARS-CoV-2 in less than one second. The testing was conducted in December 2020 through KR Biotech, a South Korea-based research institute specializing in sterilization testing of the new coronavirus.

This test results demonstrate that Violeds UV LED technology could be an effective method to disinfect airborne viruses, water systems, as well as areas where COVID-19 patients were housed, including hospital rooms.

After exposing SARS-CoV-2 to the Violeds UV LED module for 1, 3, and 5 seconds respectively, the research team observed the inactivation rate of virus particles at 99.437% in one second.

Violeds, an advanced compound semiconductor technology, is an economically advanced and safer solution for the replacement of conventional UV lamps that contain mercury, a toxic element which does not dissolve and accumulates in the human body, is released when UV lamps are broken. Because of their short lifespan of around 5,000 hours, conventional UV lamps require frequent replacement. However, UV LED technology has advantages in both cost and safety with a long life of up to 50,000 hours, which is more than 10 times the life of conventional mercury lamps.

UV LED technology is rapidly replacing the $70 million USD UV mercury lamp market due to technology advancements including miniaturization to less than 1mm2 as well as improved efficiency. As UV LED technology is adopted by new industries for bio-healthcare and virus disinfection, the global market for UV LEDs is expected to grow to $2.786 billion in 2025, according to Yole Développement, a leading market compound semiconductor research company.    

Violeds UV LED technology produces safe UV light

  • The UV LED module is light, thin, and compact with a size of less than 1mm2, and with optimal design it can completely block external UV exposure.
  • A UV light detection sensor, developed by Seoul Viosys as a safety device, enables users to check normal operation and prevent UV leakage.
  • It is possible to completely control the daily exposure of UV light to meet international safety standards.
  • Because UV light does not include harmful chemicals, there is no fear of secondary or tertiary damage from toxic materials used in the disinfection process.

“The COVID-19 pandemic and the accompanying risk of virus variants continue. Despite vaccination with influenza vaccines, flu deaths in the U.S. average more than 10,000 per year. As hundreds of millions of people around the world are exposed to various infectious diseases, prevention through disinfection is now an essential method for reducing infections. Due to the hazards of chemical disinfection methods, professionally designed UV LED disinfection systems represent a safer solution and may be the world standard in the future,” said an official at Seoul Viosys.

SETi currently has two sample disinfection products demonstrating UV-C LED technology available for purchase at

About SETi

Sensor Electronic Technology, inc. (SETi), a division of Seoul Semiconductor and Seoul Viosys, is a company based in Columbia, South Carolina, founded in 1999 by four Ph.D.s, for research and development of compound semiconductors in the United States. In 2005, SETi received the investment and R&D funding from Seoul Semiconductor and Seoul Viosys. For the development project, SETi is also working with the University of South Carolina and the University of California at Santa Barbara, adding depth to its research and development. Currently, SETi is the only company in the world that can produce UV LEDs from 200nm to 430nm. To learn more, visit

About Seoul Viosys

Seoul Viosys is a full-line solution provider for UV LED, VCSEL (Vertical Cavity Surface Emitting Laser), the next-generation light source for 3D sensor and laser, and a single-pixel RGB “Micro Clean Pixel” for displays. Established in 2002 as a subsidiary of Seoul Semiconductor, it captured No. 1 market share in the UV LED industry (LEDinside, 2018). Seoul Viosys has an extensive UV LED portfolio with all wavelengths range (200nm to 1600nm) including ultraviolet rays (UV), visible rays and infrared rays. It holds more than 4,000 patents related to UV LED technology. Violeds, its flagship UV LED technology, provides a wide range of industries with optimal solutions for strong sterilization and disinfection (UVC), skin regeneration (UVB), water/air purification and effective cultivation for horticulture. In 2018, Seoul Viosys acquired RayCan, a leading optoelectronic specialist, to add the advanced VCSEL technology which supports smartphone facial recognition and autonomous driving, and has started its mass production. In January 2020, it introduced a disruptive “Micro Clean Pixel” that has the potential to be a game-changer in the display market. To learn more, visit

About Seoul Semiconductor

Seoul Semiconductor is the world's second-largest global LED manufacturer, a ranking excluding the captive market, and has more than 10,000 patents. Based on a differentiated product portfolio, Seoul Semiconductor offers a wide range of technologies, and mass produces innovative LED products for indoor and outdoor lighting, automotive, IT products, such as mobile phone, computer displays, and other applications, as well as the UV area. The company’s world’s first development and mass production products are becoming the LED industry standard and leading the global market with a package-free LED, Wicop; a high-voltage AC-driven LED, Acrich; an LED with 10X the output of a conventional LED, nPola; a cutting edge ultraviolet clean technology LED, Violeds; an all direction light emitting technology, filament LED; a natural spectrum LED, SunLike; and more. For more information, please visit 


Seoul Semiconductor Inc.

Asia - Jeonghee Kim

Tel: +82-70-4391-8311


[email protected]

Web site: