Deep ultraviolet light is widely used for the purification of drinking water and the strict sterilization of medical devices, but they are usually used as a light source by large and bulky mercury lamps. In addition to being used in emergency situations such as battlefields, it is not environmentally friendly. To overcome this problem, Ohio State University engineers have developed a flexible, lightweight, LED-based deep UV film prototype. It can be applied to items and then kills harmful microorganisms particularly effectively.
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Researchers say the technology is expected to be commercialized in the future, bringing deeper, cheaper, and more environmentally friendly deep-UV LEDs.
Roberto Myers, an associate professor in the Department of Materials Science and Engineering at the school, said: "At present, if you want to make a deep UV lamp, you must use a mercury lamp. The toxicity of mercury is well known, and this bulb is not only cumbersome, but also inefficient. On the other hand, LEDs are very efficient, so if we make UV LEDs portable, safe, and cheap, then we can drink safe drinking water at any time."
Usually any type of ultraviolet light can kill harmful microorganisms well. For example, Boeing uses an ultraviolet disinfection system (and some vacuum cleaners) on the aircraft toilet.
Researchers at the University of Ohio have used a new nanofilm technology based on molecular beam epitaxy. With the semiconductor industry's growth method (molecular beam epitaxy), they implanted a compact aluminum gallium nitride wire (having a height of 200 nm and a diameter of about 20-50 nm), and then made a flexible conductive fiber from titanium and tantalum. .
In the test, the researchers found that when a current is applied to a nanowire, the light emitted is as bright as that on the blunt single crystal silicon. Myers said: "People always say that the commercialization of nanophotonics is not that important, but it just didn't scale it up. But now, we can do it."
The specific content of this research has been published in the recently published Applied Physics Letters.