#美国疫情##全球疫情# 制造手持式杀死新冠病毒的紫外线灯可行！

宾夕法尼亚州立大学，明尼苏达大学和日本两所大学的研究人员称，（可以制造）一种个人手持式设备，通过发放高强度的紫外线，杀死新型冠状病毒来消毒某个或称想消毒的区域。

有两种常用的方法可以对细菌和病毒区域进行消毒和消毒-化学药品或紫外线辐射。紫外线辐射在200至300纳米范围内，已知会破坏病毒，使病毒无法繁殖和感染。在当前的大流行中，这种高效的紫外线方法被广泛采用，但它需要发出足够高剂量紫外线的紫外线辐射源。尽管目前存在具有这些高剂量的设备，但是紫外线辐射源通常是昂贵的含汞气体放电灯，其需要高功率，寿命相对较短且体积大。

解决方案是开发高性能的紫外线发光二极管，这种二极管将更加便携，耐用，节能且对环境无害。尽管存在这些LED，但由于电极材料也必须对UV光透明，这一事实使向其施加电流进行发光变得复杂。

宾夕法尼亚州立大学材料科学，物理和化学副教授Roman Engel-Herbert说：“您必须确保有足够的紫外线剂量来杀死所有病毒。” “这意味着您需要一种能发出高强度紫外线的高性能紫外线LED，目前这受到所用透明电极材料的限制。”

对于显示器，智能手机和LED照明来说，找到在可见光谱中工作的透明电极材料是一个长期存在的问题，而对于紫外线来说，挑战就更加困难了。

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Killing coronavirus with handheld ultraviolet light device may be feasible

A personal, handheld device emitting high-intensity ultraviolet light to disinfect areas by killing the novel coronavirus is now feasible, according to researchers at Penn State, the University of Minnesota and two Japanese universities.

There are two commonly employed methods to sanitize and disinfect areas from bacteria and viruses—chemicals or ultraviolet radiation exposure. The UV radiation is in the 200 to 300 nanometer range and known to destroy the virus, making the virus incapable of reproducing and infecting. Widespread adoption of this efficient UV approach is much in demand during the current pandemic, but it requires UV radiation sources that emit sufficiently high doses of UV light. While devices with these high doses currently exist, the UV radiation source is typically an expensive mercury-containing gas discharge lamp, which requires high power, has a relatively short lifetime, and is bulky.

The solution is to develop high-performance, UV light emitting diodes, which would be far more portable, long-lasting, energy efficient and environmentally benign. While these LEDs exist, applying a current to them for light emission is complicated by the fact that the electrode material also has to be transparent to UV light.

"You have to ensure a sufficient UV light dose to kill all the viruses," said Roman Engel-Herbert, Penn State associate professor of materials science, physics and chemistry. "This means you need a high-performance UV LED emitting a high intensity of UV light, which is currently limited by the transparent electrode material being used."

While finding transparent electrode materials operating in the visible spectrum for displays, smartphones and LED lighting is a long-standing problem, the challenge is even more difficult for ultraviolet light.

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