Patent ID: 6010644
Filing Date: 2000-01-04
Classification: C03C,C09K

Abstract:
A long-lasting phosphor being activated by divalent europium and having a chemical composition RO.multidot.a(Al.sub.1-x Ga.sub.x).sub.2 O.sub.3 .multidot.b(Y.sub.1-y Sc.sub.y).sub.2 O.sub.3 .multidot.cB.sub.2 O.sub.3 .multidot.dEu.sup.2+ .multidot.eM.sup.n+ (where R is at least one selected from the group consisting of alkaline-earth metals including Ba, Sr, Ca, Mg and Zn, and M is at least one of auxiliary activator selected from the group consisting of Nb, Zr, Bi, Sn, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu, n+ being the ion state of the auxiliary activator with n being an integer) wherein a, b, c, d, e, x and y are within the ranges of:0.3.ltoreq.a.ltoreq.8,0<b.ltoreq.0.2,0.001.ltoreq.c.ltoreq.0.2,0.001.ltoreq.d.ltoreq.0.3,0.001.ltoreq.e.ltoreq.0.3,0.ltoreq.x<1.0, and0.ltoreq.y.ltoreq.1.0.