Is a substance absorb longer wavelength of EM wave and then emit shorter wavelength one possible? – chemistry.stackexchange.com

Is a substance absorb longer wavelength of EM wave and then emit shorter wavelength one possible? – 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 infra red under sunlight due to heating. ...

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