Long-lasting phosphor

US6010644A · kind A · utility

Assignee

• OHARA INC. · JP

Inventors

• Jie Fu · Beijing, CN
• Yasuo Ochi · Mishima, JP

Key dates

• Filing date: Mar 16, 1998
• Grant date: Jan 4, 2000
• Expiry date: Mar 16, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K11/7793
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

There is provided a long-lasting phosphor 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 and Mg and Zn, and M is at least one auxiliary activator selected from the group consisting of Nb, Zr, Bi, Mn, Sn, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu) wherein a, b, c, d, e, x and y are within ranges of: PA1 0.3.ltoreq.a.ltoreq.8, PA1 0<b.ltoreq.0.2, PA1 0.001.ltoreq.c.ltoreq.0.2, PA1 0.001.ltoreq.d.ltoreq.0.3, PA1 0.001.ltoreq.e.ltoreq.0.3, PA1 0.ltoreq.x.ltoreq.1.0, and PA1 0.ltoreq.y.ltoreq.1.0. There is also provided a long-lasting phosphor 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(Si.sub.1-y Ge.sub.y)O.sub.2 .multidot.cEu.sup.2+ .multidot.dM.sup.n+ (where R is at least one selected from the group consisting of alkaline-earth metals including Ba, Sr, Ca and Mg and Zn. and M is at least one auxiliary activato…