Patent ID: 6261477
Filing Date: 2001-07-17
Classification: C09K

Abstract:
A long-lasting phosphor being activated by divalent europium and having a chemical composition RO.a(Al.sub.1-x Ga.sub.x).sub.2 O.sub.3.bM.sub.m O.sub.n.cB.sub.2 O.sub.3.dEu.sup.2+ where R is at least one member selected from the group consisting of alkaline-earth metals and Zn, and M is at least one member selected from the group consisting of Y, Sc and Si wherein a, b, c, d and x are within the ranges of0.3.ltoreq.a.ltoreq.8,0<b.ltoreq.0.2,0.001.ltoreq.c.ltoreq.0.3,0.001.ltoreq.d.ltoreq.0.3, and0.ltoreq.x<1.0,wherein m is 2 and n is 3 if M is Y or Sc, and m is 1 and n is 2 if M is Si.