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Reference.org
Persistent luminescence
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<p>Commonly referred to as <a href="/facts/Phosphorescence/WshJFsKV">phosphorescence</a>, persistent luminescence is the emission of <a href="/facts/Light/jeofpMn4">light</a> by a phosphorescent material after an <a href="/facts/Excited_state/czcLYNnr">excitation</a> by <a href="/facts/Ultraviolet/kncBUqn5">ultraviolet</a> or <a href="/facts/Visible_spectrum/frPBh8o5">visible light</a>. </p>