Rare earth phosphor

Abstract

Phosphors capable of emitting substantially white luminescent were represented by the following general formulae, (I), (II) and (III). (Y.sub.1-X-Y-Z Lu.sub.X Tb.sub.Y Sm.sub.Z).sub.2 O.sub.2 S (I) 0<X.ltoreq.5.times.10.sup.-2 1.times.10.sup.-3 .ltoreq.Y.ltoreq.t.times.10.sup.-3 0.ltoreq.Z.ltoreq.5.times.10.sup.-2 (Y.sub.1-a-b-c Yb.sub.a Tb.sub.b Sm.sub.c).sub.2 O.sub.2 S (II) wherein: 0<a.ltoreq.5.times.10.sup.-4 1.times.10.sup.-3 .ltoreq.b.ltoreq.5.times.10.sup.-3 0.ltoreq.c.ltoreq.5.times.10.sup.-2 (Y.sub.1-d-e-f Ce.sub.d Tb.sub.e Sm.sub.f).sub.2 O.sub.2 S (III) wherein 0<d.ltoreq.1.times.10.sup.-4 .times.10.sup.-3 .ltoreq.e.ltoreq.5.times.10.sup.-3 0.ltoreq.f.ltoreq.5.times.10.sup.-2

Dependencies are inferred from the claim text.