加州大学圣塔芭芭拉分校的研究人员对紫外线LED进行了调整，以中和COVID-19病毒
2020年4月15日
多年来，科学家们已经知道紫外线可以杀死许多病毒和细菌。
加州大学圣塔芭芭拉分校固态照明和能源电子中心的研究人员
报告称他们正在利用该知识，并利用它来创建紫外线光谱中的发光二极管，从而可以对可能已被COVID-19病毒污染的表面进行消毒。
首先，入门。 电磁辐射由许多波长组成。
有些用于AM或FM无线电通信，
其他则用于在微波炉中烹饪食物。
First, a primer. Electromagnetic radiation
is composed of many wavelengths.
Some are used for radio communications, either AM or FM,
others are used to cook food in a microwave oven.
The human eye reacts to some electromagnetic wavelengths, which allows us to see the world around us.
The visible spectrum ranges from red to violet.
Any wavelengths longer than red are called infrared
— below red. Any wavelengths shorter than violet are called ultraviolet —
above violet. None of this has anything to do with the bands Deep Purple or Purple Haze. Got that? Let’s move on.
Killing Virus With Light
While some scientists rush to discover a vaccine that is effective against the COVID-19 virus,
others are working to discover new ways to sanitize areas that may have the virus on their surfaces.
Wiping door handles and light switches with disinfectant is all very good,
but how do you reach deep into ventilating systems where the virus could be hiding?
Ultraviolet LEDs could be one solution.
Christian Zollner, a doctoral candidate at UC Santa Barbara says,
“One major application is in medical situations — the disinfection of personal protective equipment, surfaces, floors, within the HVAC systems, et cetera.”
The work at UC-SB is supported by many corporate partners.
One of them is Seoul Semiconductor,
which reported last week a “99.9% sterilization of coronavirus (COVID-19) in 30 seconds” with its UV LED products.
The technology currently is used to make UV LED lamps that sterilize the interior of unoccupied vehicles.
What we call ultraviolet
is actually three different segments of the EM spectrum.
UV-A and UV-B are the ones commonly supplied to the Earth by the sun.
UV-C is the most effective as a disinfectant but does not occur in nature. It has to be created by humans.
CleanTechnica