189. What is Phosphorescence?
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The emission of radiation in a similar manner to fluorescence but on a longer timescale, so that emission continues after excitation ceases.
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Phosphorescence is a type of photoluminescence related to fluorescence. Unlike fluorescence, aphosphorescent material does not immediately re-emit the radiation it absorbs. The slower time scales of the re-emission are associated with "forbidden" energy state transitions in quantum mechanics.
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