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Three RIKEN physicists have engineered an LED (germicidal lamps) that is highly efficient in killing microbes and viruses, without harming the humans
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Ultraviolet germicidal lamps are widely used in hospitals to sterilize surfaces and medical instruments.
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Such lamps can be made with LEDs, making them energy efficient.
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However, current LEDs use ultraviolet light that damages DNA and thus cannot be used around people.
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The hunt is on to develop efficient LEDs that shine light within a narrow band of far-ultraviolet light that is both effective in disinfecting and safe for people.
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Germicidal LED lamps are often made from aluminum, gallium, and nitrogen and operate in the absence of humans.
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By increasing the amount of aluminum in the lamps, the LEDs can be modified to work in a wavelength region that is safe for humans, but this reduces their power.
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The new LED engineered by RIKEN physicists addresses this issue and could help countries in fighting pandemics by killing pathogens in rooms full of people.