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Bioblasts - Richard Altmann and MiPArt by Odra Noel
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Phosphorescence is a similar phenomenon to fluorescence. However, instead of the electron returning to its original energy state following excitation, it decays to an intermediate state (with a different spin value) where it can remain for some time (minutes or even hours) before decaying to its original state. Phosphorescence is one form of Luminescence, especially Photoluminescence.

Reference: Wikipedia (2011): “Phosphorescence”.

MitoPedia methods: Fluorometry, Spectrophotometry