Is it possible for a substance to absorb a longer wavelength of EM wave and emit a shorter wavelength? – chemistry.stackexchange.com

Is it possible for a substance to absorb a longer wavelength of EM wave and emit a shorter wavelength? – chemistry.stackexchange.com

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I know a fluorescent lamp works my emitting UV first and then the specific substance inside absorbs UV and finally emits visible light. And an object may emit infrared under sunlight due to heating. ...

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