Phosphor with afterglow characteristic
AssigneeKabushiki Kaisha Tokyo Kagaku Kenkyusho
InventorsHirofumi Moriyama, Tomofumi Moriyama, Teruo Goto
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Abstract
A phosphor exhibiting afterglow more intensely and persistently than (Sr, Eu, Dy)O.Al.sub.2 O.sub.3 phosphors. The phoshor has a chemical composition comprising mainly an Eu.sup.2+ activated strontium aluminate phosphor substance as a matrix in which a part of the strontium (Sr) is substituted with at least one of Pb, Dy and Zn.
Claims17
A phosphor having afterglow characteristics, which comprises a matrix containing an Eu.sup.2+ activated strontium aluminate phosphor substance, wherein said phosphor has a chemical composition expressed by:
- (Sr, Eu, Pb)O.y(Al, Bi).sub.2 O.sub.3,
- where Sr+Eu+Pb=1, Al+Bi=2y, said phosphor having a chemical composition of (Sr.sub.0.955, Eu.sub.0.03, Pb.sub.0.015)Al.sub.2.991 Bi.sub.0.009 O.sub.5.5.
A phosphor having afterglow characteristics, which comprises a matrix containing an Eu.sup.2+ activated strontium aluminate phosphor substance, wherein said phosphor has a chemical composition expressed by:
- (Sr, Eu, Pb, Dy)O.y(Al, Bi).sub.2 O.sub.3,
- where Sr+Eu+Pb+Dy=1, Al+Bi=2y, wherein in said composition, the value of y is 0.83.ltoreq.y.ltoreq.2.5, and the proportions in moles of Eu, Pb, Dy, Al and Bi are 0.016.ltoreq.Eu.ltoreq.0.033, 0.006.ltoreq.Pb.ltoreq.0.017, 0.05.ltoreq.Dy.ltoreq.0.133, 1.655.ltoreq.Al.ltoreq.3.334 and 0.0030.ltoreq.Bi.ltoreq.0.0100.
A phosphor having afterglow characteristics, which comprises a matrix containing an Eu.sup.2+ activated strontium aluminate phosphor substance, wherein said phosphor has a chemical composition expressed by:
- (Sr, Eu, Pb, Dy)O.(Al, Bi).sub.2 O.sub.3,
- where Sr+Eu+Pb+Dy=1, Al+Bi=2, wherein the proportions in moles of Eu, Pb, Dy, Al and Bi are 0.016.ltoreq.Eu.ltoreq.0.02, 0.006.ltoreq.Pb.ltoreq.0.010, 0.06.ltoreq.Dy.ltoreq.0.133, 1.994.ltoreq.Al.ltoreq.1.9964 and 0.0036.ltoreq.Bi.ltoreq.0.006.
A phosphor having afterglow characteristics, which comprises a matrix containing an Eu.sup.2+ activated strontium aluminate phosphor substance, wherein said phosphor has a chemical composition expressed by:
- (Sr, Zn, Eu, Pb, Dy)O.(Al, Bi).sub.2 O.sub.3,
- where Sr+Zn+Eu+Pb+Dy=1, Al+Bi=2, wherein the proportions in moles of Zn, Eu, Pb, Dy, Al and Bi are 0.013.ltoreq.Zn.ltoreq.0.027, 0.017.ltoreq.Eu.ltoreq.0.03, 0.008.ltoreq.Pb.ltoreq.0.017, 0.05.ltoreq.Dy.ltoreq.0.133, 1.994.ltoreq.Al.ltoreq.1.9964 and 0.0036.ltoreq.Bi.ltoreq.0.006.
A phosphor having afterglow characteristics, which comprises a matrix containing an Eu.sup.2+ activated strontium aluminate phosphor substance, wherein said phosphor has a chemical composition expressed by:
- (Sr, Zn, Eu, Dy)O.Al.sub.2 O.sub.3,
- where Sr+Zn+Eu+Dy=1, wherein the proportions in moles Sr, Zn, Eu, Dy are 0.920.ltoreq.Sr.ltoreq.0.925, 0.005.ltoreq.Zn.ltoreq.0.010, Eu=0.20 and Dy=0.05.
Dependencies are inferred from the claim text.