MULTIPLE RARE-EARTH CO-ACTIVATED LONG-AFTERGLOW LUMINESCENT MATERIAL
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United States of America Patent
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Issued Date -
May 22, 2008
app pub date -
Feb 12, 2007
filing date -
Nov 20, 2006
priority date (Note) -
Abandoned
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Abstract
The present invention relates to a multiple rare earth co-activated long-afterglow luminescent material having its general chemical composition depicted by a formula aMO.bAl.sub.2O.sub.3.cSiO.sub.2.dGa.sub.2O.sub.3:xEu.yB.zN, wherein a, b, c, d, x, y, and z are coefficients with the ranges of 0.5.ltoreq.a.ltoreq.2, 0.5.ltoreq.b.ltoreq.3, 0.001.ltoreq.c.ltoreq.1, 0.0001.ltoreq.d.ltoreq.1, 0.0001.ltoreq.x.ltoreq.1, 0.0001.ltoreq.y.ltoreq.1, 0.0001.ltoreq.z.ltoreq.1, M is Ca or Sr, N is Dy or Nd, wherein Sr (or Ca), Al, Si, Ga are main matrix elements and Eu, B, Dy (or Nd) elements are activators. The long-afterglow luminescent material according to the present invention has advantage of a longer persistence period and a water resistance greatly superior to known rare-earth activated aluminate long-afterglow luminescent materials.
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