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US 2006/0151747 A1Published application
Quantum-splitting fluoride-based phosphors, method of producing, and radiation sources incorporating same
AssigneeGeneral Electric Company
InventorsVenkatesan Manivannan, Alok Srivastava, Holly Comanzo
Life of this patent
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Abstract
A quantum-splitting fluoride-based phosphor comprises gadolinium, at least a first alkali metal, and a rare-earth metal activator. The phosphor is made in a solid-state method without using HF gas. The phosphor can be used alone or in conjunction with other phosphors in light sources and displays wherein it can be excited by VUV radiation, and increases the efficiency of these devices
Claims33
A phosphor comprising a material having a formula of AGdF4:RE, wherein A is a first alkali metal and is selected from the group consisting of K, Rb, Cs, and combinations thereof;
- and RE is at least a rare-earth metal activator other than gadolinium.
A phosphor blend comprising:
- (a) a first phosphor having a formula of AGdF4:RE, wherein A is a first alkali metal and is selected from the group consisting of K, Rb, Cs, and combinations thereof;
- and RE is at least a rare-earth metal activator other than gadolinium;
- (b) at least a second phosphor selected from the group consisting of LaPO4:Ce3+,Tb3+;
- GdMgB5O10:Ce3+,Tb3+;
- CeMgAl11O19:Ce3+,Tb3+;
- Ca5(PO4)3(Cl,F,OH):Sb3+,Mn2+,Eu2+;
- Sr4Al14O25:Eu2+;
- and BaAl8O13:Eu2+;
- (Ba,Sr,Ca)5(PO4)3(Cl,F,OH):Eu2+;
- (Ba,Sr,Ca)MgAl11O17:Eu2+;
- (Ba,Sr,Ca)BPO5:Eu2+;
- BaAl8O13:Eu2+;
- 2SrO.0.84P2O5.0.16B2O3:Eu2+;
- MgWO4;
- BaTiP2O8;
- (Ba,Sr,Ca)MgAl10O17:Eu2+,Mn2+;
- (Ba,Sr,Ca)5(PO4)3(Cl,F,OH):Sb3+;
- (Y,Gd,La,Lu,Sc)2O3:Eu3+;
- (Y,Gd,La,In,Lu,Sc)BO3:Eu3+;
- (Y,Gd,La)(Al,Ga)O3:Eu3+;
- (Ba,Sr,Ca)(Y,Gd,La,Lu)2O4:Eu3+;
- (Y,Gd)Al3B4O12:Eu3+;
- monoclinic Gd2O3:Eu3+;
- (Gd,Y)4(Al,Ga)2O9:Eu3+;
- (Ca,Sr)(Gd,Y)3(Ge,Si)AlO9:Eu3+;
- (Sr,Mg)3(PO4)2:Sn2+;
- GdMgB5O10:Ce3+,Mn2+;
- and 3.5MgO.0.5MgF2.GeO2:Mn4+:
- and Y2O3:Eu3+.
26 more elements
A phosphor blend comprising:
- (a) a first phosphor having a formula of (A1-yDy)(Gd1-xREx)F4;
- wherein A is a first alkali metal selected from the group consisting of K, Rb, Cs, and combinations thereof;
- D is a second alkali metal selected from the group consisting of Li, Na, K, Rb, Cs, and combinations thereof;
- RE is a rare-earth metal activator;
- and x and y are independently in a range from about 0.0001 to about 0.1;
- (b) at least a second phosphor selected from the group consisting of LaPO4:Ce3+,Tb3+;
- GdMgB5O10:Ce3+,Tb3+;
- CeMgAl10O19:Ce3+,Tb3+;
- Ca5(PO4)3(Cl,F,OH):Sb3+,Mn2+,Eu2+;
- Sr4Al14O25:Eu2+;
- and BaAl8O13:Eu2+;
- (Ba,Sr,Ca)5(PO4)3(Cl,F,OH):Eu2+;
- (Ba,Sr,Ca)MgAl10O17:Eu2+;
- (Ba,Sr,Ca)BPO5:Eu2+;
- BaAl8O13:Eu2+;
- 2SrO.0.84P2O5.0.16B2O3:Eu2+;
- MgWO4;
- BaTiP2O8;
- (Ba,Sr,Ca)MgAl10O17:Eu2+,Mn2+;
- (Ba,Sr,Ca)5(PO4)3(Cl,F,OH):Sb3+;
- (Y,Gd,La,Lu,Sc)2O3:Eu3+;
- (Y,Gd,La,In,Lu,Sc)BO3:Eu3+;
- (Y,Gd,La)(Al,Ga)O3:Eu3+;
- (Ba,Sr,Ca)(Y,Gd,La,Lu)2O4:Eu3+;
- (Y,Gd)Al3B4O12:Eu3+;
- monoclinic Gd2O3:Eu3+;
- (Gd,Y)4(Al,Ga)2O9:Eu3+;
- (Ca,Sr)(Gd,Y)3(Ge,Si)AlO9:Eu3+;
- (Sr,Mg)3(PO4)2:Sn2+;
- GdMgB5O10:Ce3+,Mn2+;
- and 3.5MgO.0.5MgF2.GeO2:Mn4+:
- and Y2O3:Eu3+.
29 more elements
A method of producing a fluoride-based quantum-splitting phosphor comprises:
- (a) selecting a desired final composition of the phosphor;
- (b) providing quantities of:
- (1) a fluoride of at least a first alkali metal selected from the group consisting of K, Rb, Cs, and combinations thereof;
- (2) fluoride of gadolinium;
- and (3) at least a fluoride of a rare-earth metal, which rare-earth metal acts as an activator of the final phosphor, and which quantities are sufficient to achieve the final composition of the phosphor;
- and (b) heating the fluorides under an atmosphere selected from the group consisting of vacuum and an inert gas, at a temperature for a time sufficient to convert the fluorides to the phosphor.
3 more elements
A light source comprising:
- (a) a source of UV radiation that is located in a sealed housing, said UV radiation including a portion in a VUV range;
- and
- (b) a phosphor material disposed within the sealed housing and adapted to be excited by the UV radiation and to emit visible light, wherein the phosphor material comprises a first phosphor having a formula of AGdF4:RE, wherein A is a first alkali metal and is selected from the group consisting of K, Rb, Cs, and combinations thereof;
- and RE is at least a rare-earth metal activator other than gadolinium.
1 more element
A display comprising:
- (a) a source of electrons;
- and
- (b) a phosphor material disposed within the sealed housing and adapted to be excited by the electrons and to emit visible light, wherein the phosphor material comprises a first phosphor having a formula of AGdF4:RE, wherein A is a first alkali metal and is selected from the group consisting of K, Rb, Cs, and combinations thereof;
- and RE is at least a rare-earth metal activator other than gadolinium.
1 more element
Dependencies are inferred from the claim text.