As with any LED, operating temperature also influences lifetime and optical output. Exceeding the recommended ambient, solder, or junction temperature will have a negative impact on the lifetime. UVC LEDs must be properly cooled to avoid accelerated optical power loss and/or shortened lifetime. The use of appropriate cooling solutions, for example metal core PCBs, thermal pastes, heat sinks, or heat pipes and fans, is prerequisite, particularly in applications where significant optical power is required and where the LED density is high.
Dosage
Finally, it is essential to look at the UVC dose that is required. The dose depends on the type of microorganism that you want to target (several studies include UVC radiation tables), and on the type of application. The system developer needs to carefully consider the target medium, is it a surface, an object, or a fluid? the characteristics of the material, the distance to the target and how quickly should disinfection be completed.
Applications
UVC can be effectively used to disinfect Water, Air, Surfaces and Food. Water - Disinfection can be done at Point of Use (PoU) and at Point of Entry (PoE). UVC disinfection does not alter the taste, temperature, or pH of water. Due to their compact dimensions UVC LEDs can be integrated into PoU disinfection systems for water faucets, fountains, and water bottles where conventional light sources cannot be used. Typical uses include laboratories for ultrapure water, in homes, and in mobile water disinfection systems.
PoE is a much more demanding application, primarily due to the high flow of water and continuous demand cycle. Nevertheless, Bolb Inc. are already working with early adopter companies that have begun installing high-flow water disinfection reactors. These systems can be used in municipal water treatment plants, swimming pools, fish farming, ballast water treatment systems on ships, and in many industrial applications. Air - UVC light has a significant impact in preventing transmission of airborne viruses. Air disinfection systems can be deployed in classrooms, offices and public transport. Devices already come in many forms, for example mobile units, air troffers, air ducts, and upper air disinfection solutions. With UVC LEDs, new, innovative solutions for clean and healthy air are possible, from retrofitting into existing systems to development of completely new applications. The “single pass kill rate”, in other words the amount or percentage of virus that will be killed in one pass through an Air disinfection device is considered a key parameter. LED systems have been developed that
www.cieonline.co.uk
can disinfect an air flow of 10,000 litres per minute and achieve a 99.96% kill rate in a single pass against aerosolized Staphylococcus aureus. This is with just one 25-LED module with 2.5 W of optical power. Surface – UVC LEDs offer a simple way to disinfect objects and surfaces that need to be kept free of viruses, bacteria, or mold. They can be deployed in hospitals, for medical equipment, in forensics, and where objects are regularly touched, for example door handles, handrails, ATMs, restaurant menus, etc. For surface disinfection systems, designers must take particular care to ensure safety because this is where users face the highest risk of exposure to UVC radiation. Food - Essentially a combination of water and surface disinfection, food disinfection is worth mentioning separately, as food loss due to bacteria or fungus can be crucial. In addition, food poisoning is a well-known risk, its increasingly common for recalls on salad, vegetables and meat after treatment with contaminated water used in the process. From seeds, to plants, to fruit and vegetables, as well as in livestock breeding, UVC LEDs can be used in many applications. They can also be put to good use in disinfecting farms, greenhouses, vertical farms, food processing factories, and kitchens, as well as in food transport, storage, and retail. Not only do they help to prevent food waste, UVC LEDs can also significantly reduce the use of pesticides, chemicals, and antibiotics in the farming industry.
Design support
Anglia offers support for customer designs with free evaluation kits, demonstration boards and samples of Bolb Inc. products via the EZYsample service which is available to all registered Anglia Live account customers.
Anglia’s engineering team are also on hand to support designers with UVC based designs and can offer advice and support at component and system level. This expertise is available to assist customers with all aspects of their product design, providing hands on support and access to additional comprehensive Bolb Inc. resources which includes technical application notes, case studies, whitepapers and reference designs to help designers select the right product for their application. Visit
www.anglia-live.com to see the full range of Bolb Inc. products available from Anglia.
Article based on original content reproduced with kind permission of Paul Blanc, European sales director for Bolb Inc.
Components in Electronics
June 2023 11
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