
doi: 10.1201/b11201-5
Luminescence is the spontaneous emission of light from the excited electronic states of physical systems. –e emission is preceded by the process of excitation, which may be produced by a variety of agents. Ifit is achieved by the absorption of light it is called photoluminescence, if by the action of an electric £eld electroluminescence, if by a chemical reaction chemiluminescence, and so on.
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