Fluorescence and phosphorescence are both examples of photoluminescence. In both cases, light is absorbed and then re-emitted at a less-energetic wavelength.
Fluorescent and phosphorescent objects usually glow under exposure to ultraviolet light (though this is not a requirement).
Fluorescence involves absorbing and releasing lower energy light almost immediately, while the light release of phosphorescence is delayed, so these materials appear to glow in the dark.
From http://chemistry.about.com/od/imagesclipartstructures/ig/Fluorescence---Phosphorescence/
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