Long persistent phosphorescence phosphor
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United States of America Patent
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Nov 24, 1998
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app pub date -
Jul 22, 1997
filing date -
Jul 22, 1997
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Abstract
A long persistent phosphorescence phosphor contains a europium-activated long persistent phosphorescence silicate phosphor of the formula (I), m(Sr.sub.1-a M.sup.1.sub.a)O.multidot.n(Mg.sub.1-b M.sup.2.sub.b)O.multidot.2(Si.sub.1-c Ge.sub.c)O.sub.2 :Eu.sub.x Ln.sub.y (I) containing at least one halogen atom in a specific amount, and an organic fluorescent pigment which is deposited on the surface of the europium-activated long persistent silicate phosphor.
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