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- Luminescence + ('''Luminescence''' is spontaneous emission … '''Luminescence''' is spontaneous emission of radiation from an electronically or vibrationally excited species not in thermal equilibrium with its environment (IUPC definition). An alternative definition is "Luminescence is emission of </br>light by a substance not resulting from heat." Luminescence comprises many different pehnomena. Luminescence from direct photoexcitation of the emitting species is called photoluminescence. Both [[fluorescence]] and [[phosphorescence]] are forms of photoluminescence. In biomedical research also forms of chemiluminescence (e.g.the luciferin reaction) are used. In chemiluminescence the emission of radiation results from a chemical reaction. For other forms of luminescence see [http://goldbook.iupac.org/L03641.html the IUPAC Gold Book].upac.org/L03641.html the IUPAC Gold Book].)
