Luminescence is the emission of optical radiation (ultraviolet, visible, or infrared) by a substance due to a process other than heating. In the broad chemical/photochemical sense, luminescence is the spontaneous emission of radiation from an electronically or vibrationally excited species that is not in thermal equilibrium with its environment.
Luminescence is the emission of optical radiation (ultraviolet, visible, or infrared) by a substance due to a process other than heating. In the broad chemical/photochemical sense, luminescence is the spontaneous emission of radiation from an electronically or vibrationally excited species that is not in thermal equilibrium with its environment.
Source: Wikipedia "Luminescence" · CC BY-SA 4.0
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