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US 6,402,987 B1Granted
YMO4:Eu,L phoshpor with improved lumen maintenance
AssigneeGeneral Electric Company
InventorsAlok Mani Srivastava, Charles David Greskovich, Steven Jude Duclos, Holly Ann Comanzo, William Winder Beers
Life of this patent
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Abstract
A Y(P,V)O4:Eu3+ red emitting phosphor is doped with at least one of a trivalent rare earth ion excluding Eu and a divalent metal ion to improve the lumen maintenance of the phosphor. The preferred material is the Y(P,V)O4:Eu3+ phosphor doped with trivalent Tb3+ ions and divalent Mg2+ ions.
Claims41
A composition of matter comprising:
- Y(P1−aVa)O4:Eu,L
- wherein 0≦a<1;
- and L comprises at least one ion selected from the group consisting of trivalent rare earth ions excluding Eu and divalent metal ions.
A composition of matter comprising:
- (Y1−x−dDxTd)MO4:Eu;
- wherein D comprises at least one divalent metal ion species;
- M comprises at least one of vanadium and phosphorus;
- 0<x≦0.05;
- 0<d≦0.02;
- and T satisfies a condition selected from the group consisting of:
- (a) T comprising at least one trivalent rare earth ion species other than Eu, Sm, and Dy when M is vanadium;
- and
- (b) T comprising at least one trivalent rare earth ion species other than Eu when M is other than vanadium.
6 more elements
A composition of matter comprising:
- (Y1−xMgx)VO4:Eu;
- wherein 0.03<x≦0.05.
A phosphor comprising a material having a formula selected from the group consisting of:
- (Y1−dTbd)VO4:Eu;
- and
- (Y1−xMgxTbd)VO4:Eu;
- wherein 0<x≦0.05, 0<d≦0.02, and
- the phosphor maintains at least 87% of the original lumen output after 100 hours of operation of a lamp using the phosphor.
2 more elements
A lamp comprising:
- a bulb having an inside surface and an outside surface;
- a gas discharge envelope;
- a base;
- at least two gas discharge electrodes;
- and
- a phosphor on at least one of the surfaces of the bulb, wherein the phosphor comprises
- Y(P1−aVa)O4:Eu,L
- wherein 0≦a<1;
- and L comprises at least one ion selected from the group consisting of trivalent rare earth ions excluding Eu and divalent metal ions.
6 more elements
A lamp comprising:
- a bulb having an inside surface and an outside surface;
- a gas discharge envelope;
- a base;
- at least two gas discharge electrodes;
- and
- a phosphor on at least one of the surfaces of the bulb, wherein the phosphor comprises:
- (Y1−x−dDxTd)(P1−aVa)O4:Eu;
- wherein 0≦a<1, 0<x≦0.05, 0<d≦0.02,
- D comprises at least one divalent metal ion species, and
- T comprises at least one trivalent rare earth ion species excluding Eu.
7 more elements
A lamp comprising:
- a bulb having an inside surface and an outside surface;
- a gas discharge envelope;
- a base;
- at least two gas discharge electrodes;
- and
- a phosphor on at least one of the surfaces of the bulb, wherein the phosphor comprises
- (Y1−xMgx)VO4:Eu;
- wherein 0.03<x≦0.05.
5 more elements
A lamp comprising:
- a bulb having an inside surface and an outside surface;
- a gas discharge envelope;
- a base;
- at least two gas discharge electrodes;
- and
- a phosphor on at least one of the surfaces of the bulb, wherein the phosphor comprises
- (Y1−dTbd)VO4:Eu;
- wherein 0.1<d<1.
5 more elements
A lamp comprising:
- a bulb having an inside surface and an outside surface;
- a gas discharge envelope;
- a base;
- at least two gas discharge electrodes;
- and
- a phosphor on at least one of the surfaces of the bulb, wherein the phosphor comprises a material selected from the group consisting of:
- (Y1−x−dMgxTbd)VO4:Eu;
- (Y1−xMgx)PO4:Eu;
- (Y1−dTbd)PO4:Eu;
- (Y1−x−dMgxTbd)PO4:Eu;
- (Y1−xMgx)(P1−aVa)O4:Eu;
- (Y1−dTbd)(P1−aVa)O4:Eu;
- (Y1−x−dMgx Tbd)(P1−aVa)O4:Eu;
- and mixtures thereof;
- wherein 0<a<1, 0<x≦0.05, and 0<d≦0.02.
12 more elements
A lamp comprising:
- a bulb having an inside surface and an outside surface;
- a gas discharge envelope;
- a base;
- at least two gas discharge electrodes;
- and a phosphor on at least one of the surfaces of the bulb;
- wherein the phosphor comprises a material having a formula selected from the group consisting of:
- (Y1−dTbd)VO4:Eu;
- and
- (Y1xMgxTbd)VO4:Eu;
- wherein 0<x≦0.05, 0<d≦0.02, and
- the phosphor maintains at least 87% of the original lumen output after 100 hours of operation of a lamp using the phosphor.
8 more elements
A method of making a composition of matter, said method comprising the steps of:
- (a) mixing at least one compound of phosphorus and compounds selected from the group consisting of carbonate, oxide, oxalate, nitrate, and mixtures thereof of:
- (1) yttrium,
- (2) vanadium,
- (3) europium, and
- (4) at least one element selected from the group consisting of (i) trivalent rare earth elements excluding Eu and (ii) divalent metal elements;
- and
- (b) heating a resulting mixture of said compounds.
4 more elements
A method for making a device selected from the group consisting of a lamp and a display, said method comprising the steps of:
- (a) forming a mixture comprising at least one compound of phosphorus and compounds selected from the group consisting of carbonate, oxide, oxalate, nitrate, and mixtures thereof of:
- (1) yttrium;
- (2) vanadium;
- (3) europium;
- and
- (4) at least one element selected from the group consisting of (i) trivalent rare earth elements excluding Eu and (ii) divalent metal elements;
- (b) coating said mixture on a substrate to form a coated substrate;
- (c) heating said coated substrate to convert said mixture into a phosphor and to produce said device having said substrate coated with said phosphor.
5 more elements
A composition of matter comprising:
- (Y1−x−dDxTd)VO4:Eu;
- wherein T comprises at least one trivalent rare earth metal ion species other than Eu;
- D comprises at least one divalent metal ion species other than Be, Cd, and Zn;
- 0<x≦0.08;
- 0≦d≦0.02;
- and
- wherein x and d together satisfy a condition selected from the group consisting of:
- (a) 0.03<x≦0.05 and 0≦d≦0.02 when D is Mg,
- (b) x>0.05 and 0≦d≦0.02 when D is selected from the group consisting of Ca, Ba, and Sr, and
- (c) 0.005<x≦0.05 and 0<d≦0.02 when D is Mn.
7 more elements
A composition of matter comprising:
- (Y1−x−dDxTd)VO4:Eu;
- wherein T comprises at least one trivalent rare earth metal ion species other than Eu;
- D comprises at least one divalent metal ion species other than Be;
- 0<d≦0.02;
- 0<x≦0.05;
- and
- wherein x satisfies a condition selected from the group consisting of:
- (a) 0.03<x≦0.05 when D is Mg,
- (b) 0.0004<x<0.05 when D is Zn, and
- (c) x>0.05 when D is selected from the group consisting of Ca, Ba, and Sr.
7 more elements
A composition of matter comprising:
- (Y1−xDx)VO4:Eu;
- wherein D and x satisfy a condition selected from the group consisting of:
- (a) D comprising at least one divalent metal ion species other than Cd and Zn;
- 0<x≦0.05;
- (b) D comprising at least one divalent metal ion species other than Ca and Mn when 0.00001<x<0.005;
- (c) D comprising at least one of Ca and Mn when 0.005<x≦0.05.
3 more elements
A composition of matter comprising:
- (Y1−xDx)PO4:Eu;
- wherein D is a divalent metal ion species, and 0<x≦0.05.
A composition of matter comprising
- (Y1−dTd)PO4:Eu;
- wherein T is a trivalent rare-earth ion species other than Eu3+, and 0<d≦0.02.
Dependencies are inferred from the claim text.