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Wikenigma - an Encyclopedia of Unknowns Wikenigma - an Encyclopedia of the Unknown Wikenigma - an Encyclopaedia of Unknowns Wikenigma - an Encyclopaedia of the Unknown

Persistent luminescence

Persistent luminescence is the phenomenon found in materials which glow in the dark after the end of an excitation with UV or visible light. There are a number of such materials, routinely used in toys, watch dials, luminous paints, safety signs etc. They are mainly phosphors such as silver-activated zinc sulfide or doped strontium aluminate, and typically glows a pale green to greenish-blue color.

It has been known since the 1950s that the phenomenon involves so-called 'energy traps' (such as electron or hole trap) in a material, but the an exact explanation of the underlying physics is still lacking.

See: Wikipedia

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