Wednesday, September 28, 2022

New Ultra-Violet LEDs Offers Higher Sterilization Efficiency

By Jay Soni

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Devices combine typical radiant power with a longer service life and a shorter wavelength for higher disinfection efficiency.

The concept of sterilization has become more familiar among public places after the pandemic period. The use of sterilizers has increased throughout the world and to meet this demand, the technology asks for an update and to meet this large scale of sterilization process, higher efficiency is required.

UV Diodes by Vishay Intertechnology Inc. | Credit : Vishay Intertechnology Inc.

Vishay Intertechnology Inc. has introduced two UVC (short wavelength ultraviolet) emitting diodes in a ceramic / quartz-based package. The new VLMU35CR40-275-120 and VLMU35CR41-275-120 delivers higher radiant power at a lower cost while offering higher disinfection efficiency and a longer service life.

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The device features a radiant power of 37mW at 250mA. When considered in terms of mW/$ performance, it delivers 30 % higher power than lower power emitter diodes and 12x better than previous-generation solutions. The device also provides a minimum radiant power of 30 mW at 250 mA.

These diodes are built on AlGaN technology and aim to replace low pressure UVC mercury tubes in compact designs requiring small components. The device features DC forward current up to 300 mA, forward voltage down to 5.2 V, and an emission angle of ± 60°. Additionally, the device is RoHS-compliant, and its halogen-free design makes it compatible for reflow soldering processes. It also features a Moisture Sensitivity Level of 3 in accordance with J-STD-020.

Features
  • Ceramic SMT package with quartz window
  • Dimension (L x W x H) in mm: 3.45 x 3.45 x 1.7
  • DC forward current: up to 300 mA
  • Wavelength range of 265 nm to 280 nm
  • 20 % higher sterilization efficiency
  • Service life of 27 000 hours at 250 mA and 25 °C.

Applications include sterilization devices for domestic as well as commercial and medical equipment; for example, toothbrushes, water bottles, refrigerators, air purifiers, door handles, medical instruments, coffee machines, ATMs, toilet seats, vacuum cleaners, and more.


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