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US 6,982,046 B2Granted
Light sources with nanometer-sized VUV radiation-absorbing phosphors
AssigneeGeneral Electric Company
InventorsAlok Mani Srivastava, Anant Achyut Setlur, Sergio Paulo Martins Loureiro, Darryl Stephen Williams, Mohan Manoharan
Life of this patent
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Abstract
A light source comprises: (a) a source of plasma discharge that emits electromagnetic radiation, a portion of which has wavelengths shorter than about 200 nm; and (b) a phosphor composition that comprises particles, each of the particles comprising at least a first phosphor and at least a second phosphor, the phosphor composition is disposed such that the first phosphor absorbs substantially the portion of EM radiation having wavelengths shorter than about 200 nm, and the first phosphor emits EM radiation having wavelengths longer than about 200 nm.
Claims24
A light source comprising:
- a source of plasma discharge that emits electromagnetic (“EM”) radiation, a portion of which has wavelengths shorter than about 200 nm;
- and
- a phosphor composition that comprises a plurality of particles, each of said particles comprising at least a first phosphor and at least a second phosphor, said phosphor composition is disposed such that said first phosphor absorbs substantially said portion of EM radiation having wavelengths shorter than about 200 nm, and said first phosphor emits EM radiation having wavelengths longer than about 200 nm, wherein said at least a first phosphor comprises a plurality of nanometer-sized particles disposed around a particle of said second phosphor.
A light source comprising:
- a source of plasma discharge that emits electromagnetic (“TM”) radiation, a portion of which has wavelengths shorter than about 200 nm;
- and a phosphor composition that comprises a plurality of particles, each of said particles comprising at least a first phosphor and at least a second phosphor, said phosphor composition is disposed such that said first phosphor absorbs substantially said portion of EM radiation having wavelengths shorter than about 200 nm, and said first phosphor emits EM radiation having wavelengths longer than about 200 nm, wherein said at least a first phosphor forms a shell around each particle of said second phosphor.
A light source comprising:
- a source of plasma discharge that emits EM radiation, a portion of which has wavelengths shorter than about 200 nm, said source of plasma discharge being contained in a sealed housing and comprising mercury gas, which produces said plasma discharge upon application of a voltage across said mercury gas;
- and
- a phosphor composition that comprises a plurality of particles of at least a first phosphor and a plurality of particles of at least a second phosphor, wherein said particles of said at least a first phosphor have a nanometer size, each of particles of said at least a second phosphor is coated with particles of said at least a first phosphor, said phosphor composition is disposed such that said first phosphor absorbs substantially said portion of EM radiation having wavelengths shorter than about 200 nm, and said first phosphor emits EM radiation having wavelengths longer than about 200 nm;
- wherein said particles of said at least a first phosphor have a size in a range from about 1 nm to about 500 nm;
- said particles of said at least a second phosphor have a size in a range from about 2 micrometers to about 6 micrometers;
- said at least a first phosphor is selected from the group consisting of LaPO4:Pr3+;
- LaB3O6:Pr3+;
- LaBO3:Pr3+;
- YBO3:Pr3+;
- GdBO3:Pr3+;
- LuBO3:Pr3+;
- (Gd,Y)B3O6:Pr3+;
- Sr,Ca)Al12O19:Pr3+;
- (La,Gd,Y)MgB5O10:Pr3+;
- SrB4O7:Pr3+;
- CaMgAl11.33O19:Pr3+;
- CaMgAl14O23:Pr3+;
- YPO4:Pr3+;
- GdPO4:Pr3+;
- Y2SiO5:Pr3+;
- YPO4:Bi3+;
- LuPO4:Bi3+;
- LaPO4:Pb2+;
- LaB3O6:Pb2+;
- LaBO3:Pb2+;
- YBO3:Pb2+;
- GdBO3:Pb2+;
- LuBO3:Pb2+;
- (Gd,Y)B3O6:Pb2+;
- (Sr,Ca)Al12O19:Pb2+;
- (La,Gd,Y)MgB5O10:Pb2+;
- SrB4O7:Pb2+;
- CaMgAl11.33O19:Pb2+;
- CaMgAl14O23:Pb2+;
- YPO4:Pb2+;
- GdPO4:Pb2+;
- Y2SiO5:Pb2+;
- YPO4:Pb2+;
- LuPO4:Pb2+;
- LaPO4:Pr3+,Pb2+;
- LaB3O6:Pr3+,Pb2+;
- LaBO3:Pr3+,Pb2+;
- YBO3:Pr3+,Pb2+;
- GdBO3:Pr3+,Pb2+;
- LuBO3:Pr3+,Pb2+;
- (Gd,Y)B3O6:Pr3+,Pb2+;
- (Sr,Ca)Al12O19:Pr3+,Pb2+;
- (La,Gd,Y)MgB5O10:Pr3+,Pb2+;
- SrB4O7:Pr3+,Pb2+;
- CaMgAl11.33O19:Pr3+,Pb2+;
- CaMgAl14O23:Pr3+,Pb2+;
- YPO4:Pr3+,Pb2+;GdPO4:Pr3+,Pb2+;
- Y2SiO5:Pr3+,Pb2+;
- YPO4:Bi3+, Pb2+;
- LuPO4:Bi3+,Pb2+;
- LaPO4:Bi3+,Pb2+;
- LaPO4:Pr3+,Pb2+,Bi3+;
- LaBO3O6:Pr3+,Pb2+,Bi3+;
- LaBO3:Pr3+, Pb2+,Bi3+;
- YBO3:Pr3+,Pb2+,Bi3+;
- GdBO3:Pr3+,Pb2+,Bi3+;
- LuBO3:Pr3+,Pb2+,Bi3+;
- (Gd,Y)B3O6:Pr3+,Pb2+,Bi3+;
- (Sr,Ca)Al12O19:Pr3+,Pb2+,Bi3+;
- (La,Gd,Y)MgB5O10 :Pr3+,Pb2+,Bi3+;
- SrB4O7:Pr3+,Pb2+,Bi3+;
- CaMgAl11.33O19:Pr3+,Pb2+,Bi3+;
- CaMgAl14O23:Pr3+,Pb2+,Bi3+;
- YPO4:Pr3+,Pb2+,Bi3+;
- GdPO4:Pr3+,Pb2+,Bi3+;
- Y2SiO5:Pr3+,Pb2+,Bi3+;
- YPO4:Pr3+,Bi3+,Pb2+;
- LuPO4:Pr3+,Bi3+,Pb2+;
- (Ca,Mg,Sr)SO4:Pb2+;
- CaLi2SiO4:Pb2+;
- (Ca,Ba,Sr)SiO3:Pb2+;
- Ba(Y,Gd,Lu)B9O16:Bi3+;
- YF3:Bi3+;
- YOF:Bi3+;
- (Gd,Y)OF:Bi3+,Pr3+;
- (Y,Gd)3Al5O12:Bi3+;
- combinations thereof;
- and
- said at least a second phosphor emits visible light and is selected from the group consisting of BaMg2Al16O27:Eu2+;
- CeMgAl11O19:Tb3+;
- Y2O3:Eu3+;
- (Ba,Sr,Ca)5(PO4)3(Cl,F,OH);Eu2+;
- (Ba,Sr,Ca)MgAl10O17:Eu2+;
- (Ba,Sr,Ca)BPO5:Eu2+;
- Sr4Al14O25: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+;
- LaPO4:Ce3+,Tb3+;
- GdMgB5O10:Ce3+, Tb3+, Mn2+;
- GdMgB5O10:Ce3+, Tb3+;
- (Tb,Y,Lu,La,Gd)3 (Al,Ga)5O12:Ce3+;
- (Ba,Sr,Ca)5(PO4)3(Cl,F,OH):Eu2+, Mn2+, 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)Al3O9:Eu3+;
- (Sr,Mg)3(PO4)2:Sn2+;
- GdMgB5O10:Ce3+,Mn2+;
- 3.5MgO.0.5MgF2.GeO2:Mn4+;
- and combinations thereof.
110 more elements
A light source comprising:
- a source of plasma discharge that emits EM radiation, a portion of which has wavelengths shorter than about 200 nm, said source of plasma discharge being contained in a sealed housing and comprising mercury gas, which produces said plasma discharge upon application of a voltage across said mercury gas;
- and
- a phosphor composition that comprises a plurality of particles of at least a first phosphor and a plurality of particles at least a second phosphor, wherein said particles of said at least a first phosphor have a nanometer size, each of particles of said at least a second phosphor is coated with particles of said at least a first phosphor, said phosphor composition is disposed such that said first phosphor absorbs substantially said portion of EM radiation having wavelengths shorter than about 200 nm, and said first phosphor emits EM radiation having wavelengths longer than about 200 nm;
- wherein said particles of said at least a first phosphor have a size in a range from about 1 nm to about 500 nm;
- said particles of said at least a second phosphor have a size in a range from about 2 micrometers to about 6 micrometers;
- said at least a first phosphor is selected from the group consisting of LaPO4:Pr3+;
- LaB3O6:Pr3+;
- LaBO3:Pr3+;
- YBO3:Pr3+;
- GdBO3:Pr3+;
- LuBO3:Pr3+;
- (Gd,Y)B3O6:Pr3+;
- (Sr,Ca)Al12O19:Pr3+;
- (La,Gd,Y)MgB5O10:Pr3+;
- SrB4O7:Pr3+;
- CaMgAl11.33O19:Pr3+;
- CaMgAl14O23:Pr3+;
- YPO4:Pr3 +;
- GdPO4:Pr3+;
- Y2SiO5:Pr3+;
- YPO4:Bi3+;
- LuPO4:Bi3+;
- (Ca,Mg,Sr)SO4:Pb2+;
- CaLi2SiO4:Pb2+;
- (Ca,Ba,Sr)SiO3:Pb2+;
- Ba(Y,Gd,Lu)B9O16:Bi3+;
- YF3:Bi3+;
- YOF:Bi3+;
- (Gd,Y)OF:Bi3+,Pr3+;
- (Y,Gd)3Al5O12:Bi3+;
- and combinations thereof;
- and
- said at least a second phosphor emits visible light and is selected from the group consisting of BaMg2Al16O27:Eu2+;
- CeMgAl11O19:Tb3+;
- Y2O3:Eu3+;
- (Ba,Sr,Ca)5(PO4)3 (Cl,F,OH):Eu2+;
- (Ba,Sr,Ca)MgAl10O17:Eu2+;
- (Ba,Sr,Ca)BPO5:Eu2+;
- Sr4Al14O25: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+;
- LaPO4:Ce3+,Tb3+;
- GdMgB5O10:Ce3+, Tb3+, Mn2+;
- GdMgB5O10:Ce3+, Tb3+;
- (Tb,Y,Lu,La,Gd)3 (Al,Ga)5O12:Ce3+;
- (Ba,Sr,Ca)5(PO4)3(Cl,F,OH):Eu2+, Mn2+, 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)Al3O9:Eu3+;
- (Sr,Mg)3(PO4)2:Sn2+;
- GdMgB5O10:Ce3+,Mn2+;
- 3.5MgO.0.5MgF2.GeO2:Mn4+;
- and combinations thereof.
60 more elements
A method for making a light source, said method comprising:
- providing a source of plasma discharge that emits EM radiation, a portion of which has wavelengths shorter than about 200 nm;
- containing said source of plasma discharge in a sealed housing;
- and
- disposing a phosphor composition in said seaed housing, which phosphor composition comprises a plurality of particles, each of said particle comprising at least a first phosphor and at least a second phosphor, said at least a first phosphor being disposed around each particle of said second phosphor, and said phosphor composition being disposed such that said first phosphor absorbs substantially said portion of EM radiation having wavelengths shorter than about 200 nm, and said first phosphor emitting EM radiation having wavelengths longer than about 200 nm.
1 more element
A method for making a light source, said method comprising:
- providing an envelope made of a material, that is substantially transparent;
- depositing a layer of a phosphor composition on an inner surface of said envelope, said phosphor composition comprising a plurality of particles, each of said particles comprising at least a first phosphor and at least a second phosphor, said at least a first phosphor fanning a coating around each of particles of said at least a second phosphor;
- evacuating said envelope to provide an evacuated envelope having said layer of said phosphor composition thereon;
- adding a first amount of mercury and a second amount of an inert gas into said evacuated envelope;
- providing a means for generating a plasma discharge from said mercury and said inert gas;
- and
- sealing said envelope to produce said light source.
4 more elements
A phosphor composition comprising a plurality of particles, each of said particles comprising at least a first phosphor and at least a second phosphor, said first phosphor being capable of absorbing EM radiation having wavelengths shorter than about 200 nm, and being capable of emitting EM radiation having wavelengths longer than about 200 nm, wherein said first phosphor comprises a plurality of nanometer-sized particles, which are disposed around a particle of said second phosphor.
A phosphor composition comprising a plurality of particles, each of said particles comprising at least a first phosphor and at least a second phosphor, said first phosphor being capable of absorbing EM radiation having wavelengths shorter than about 200 nm, and being capable of emitting EM radiation having wavelengths longer than about 200 nm, wherein said first phosphor comprises a shell around a particle of said second phosphor.
Dependencies are inferred from the claim text.