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US 6,809,781 B2Granted
Phosphor blends and backlight sources for liquid crystal displays
AssigneeGeneral Electric Company
InventorsAnant Achyut Setlur, Alok Mani Srivastava, Holly Ann Comanzo
Life of this patent
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Abstract
A phosphor composition that comprises at least one phosphor emitting in each of the blue, green, and red regions of the visible spectrum is disposed adjacent to a backlight source of a color liquid crystal display. The phosphor composition emits strongly in the wavelength ranges of color filters used in such display. The backlight source includes either a semiconductor light-emitting diode or an organic light-emitting device.
Claims28
A phosphor composition for a backlight source of a liquid crystal display (“LCD”), said phosphor composition comprising at least a phosphor emitting blue light, at least a phosphor emitting green light, and at least a phosphor emitting red light;
- wherein said at least a phosphor emitting blue light is selected from the group consisting of (Sr,Ca,Ba,Mg)10(PO4)6(F,Cl,Br,OH):Eu2+;
- (Ba,Sr,Ca)MgAl10O17:Eu2+;
- (Sr,Ca)10(PO4)6•nB2O3:Eu2+, wherein 0<n<1;
- 2 SrO•0.84 P2O5•0.16 B2O3:Eu2+;
- Sr2Si3O8•2 SrCl2:Eu2+;
- Ba3MgSi2O8:Eu2+;
- Sr4Al14O25:Eu2+;
- BaAl8O13;
- Eu2+;
- and mixtures thereof;
- said at least a phosphor emitting green light is selected from the group consisting of (Ba,Sr,Ca)MgAl10O17:Eu2+,Mn2+;
- (Ba,Sr,Ca)Al2O4:Eu2+;
- (Y,Gd,Lu,Sc,La)BO3:Ce3+,Tb3+;
- (Ba,Sr,Ca)2SiO4:Eu2+;
- (Ba,Sr,Ca)2(Mg,Zn)Si2O7:Eu2+;
- (Sr,Ca,Ba)(Al,Ga,In)2S4:Eu2+;
- (Y,Gd,Tb,La,Sm,Pr,Lu)x(Al,Ga,In)yO12:Ce3+, wherein x is in the range from about 2.8 to and including 3, and y is in the range from about 4.9 to about 5.1;
- (Sr,Ca,Ba,Mg,Zn)2P2O7:Eu2+,Mn2+;
- (Ca,Sr,Ba,Mg)10(PO4)6(F,Cl,Br,OH):
- Eu2+, Mn2+;
- (Ca,Sr,Ba)8(Mg,Zn)(SiO4)4(Cl,F)2:Eu2+,Mn2+;
- and mixtures thereof;
- and said at least a phosphor emitting red light is selected from the group consisting of (Gd,Y,Lu,La)2O3:Eu3+,Bi3+;
- (Gd,Y,Lu,La)2O2S:Eu3+, Bi3+;
- (Gd,Y,Lu,La)VO4:Eu3+,Bi3+;
- SrS:Eu2+;
- SrY2S4:Eu2+;
- CaLa2S4:Ce3+;
- (Ca,Sr)S:Eu2+;
- 3.5 MgO•0.5 MgF2•GeO2:Mn4+;
- (Ba,Sr,Ca)MgP2O7:Eu2+,Mn2+;
- and mixtures thereof.
29 more elements
A backlighting system for an LCD comprising:
- a backlight source emitting light having a first spectrum at least in a range from about 300 nm to about 450 nm;
- and a phosphor composition comprising at least a phosphor emitting blue light, at least a phosphor emitting green light, and at least a phosphor emitting red light;
- wherein said at least a phosphor emitting blue light is selected from the group consisting of (Sr,Ca,Ba,Mg)10(PO4)6(F,Cl,Br,OH):Eu2+;
- (Ba,Sr,Ca) MgAl10O17:Eu2+;
- (Sr,Ca)10(PO4)6•nB2O3:Eu2+, wherein 0<n<1;
- 2 SrO•0.84 P2O5•0.16 B2O3:Eu2+;
- Sr2Si3O8•2 SrCl2:Eu2+;
- Ba3MgSi2O8:Eu2+;
- Sr4Al14O25:Eu2+;
- BaAl8O13:Eu2+;
- and mixtures thereof;
- said at least a phosphor emitting greenlight is selected from the group consisting of (Ba,Sr,Ca)MgAl10O17:Eu2+,Mn2+;
- (Ba,Sr,Ca)Al2O4:Eu2+;
- (Y,Gd,Lu,Sc,La)BO3:Ce3+,Tb3+;
- (Ba,Sr,Ca)2SiO4:Eu2+;
- (Ba,Sr,Ca)2(Mg,Zn)Si2O7:Eu2+;
- (Sr,Ca,Ba)(Al,Ga,In)2S4:Eu2+;
- (Y,Gd,Tb,La,Sm,Pr,Lu)x(Al,Ga)yO12:Ce3+, wherein x is in the range from about 2.8 to and including 3, and y is in the range from about 4.9 to about 5.1;
- (Sr,Ca,Ba,Mg,Zn)2P2O7:Eu2+,Mn2+;
- (Ca,Sr,Ba,Mg)10(PO4)6(F,Cl,Br,OH):
- Eu2+, Mn2+;
- (Ca,Sr,Ba)8(Mg,Zn)(SiO4)4(Cl,F)2:Eu2+, Mn2+;
- and mixtures thereof;
- and said at least a phosphor emitting red light is selected from the group consisting of (Gd,Y,Lu,La)2O3:Eu3+,Bi2+;
- (Gd,Y,Lu,La)2O2S:Eu3+,Bi3+;
- (Gd,Y,Lu,La)VO4:Eu3+,Bi3+;
- SrS:Eu2+;
- SrY2S4:Eu2+;
- CaLa2S4:Ce3+;
- (Ca,Sr)S:Eu2+;
- 3.5 MgO•0.5 MgF2•GeO2:Mn4+;
- (Ba,Sr,Ca)MgP2O7:Eu2+,Mn2+;
- and mixtures thereof;
- wherein said phosphor composition is disposed to absorb light of at least a portion of said first spectrum and emits light having a second spectrum different from said first spectrum.
31 more elements
A liquid crystal display comprising:
- (a) a backlighting system comprising:
- (1) a backlight source emitting light having a first spectrum at least in a range from about 300 nm to about 450 nm;
- and
- (2) a phosphor composition comprising at least a phosphor emitting blue light, at least a phosphor emitting green light, and at least a phosphor emitting red light;
- wherein said at least a phosphor emitting blue light is selected from the group consisting of (Sr,Ca,Ba,Mg)10(PO4)6(F,Cl,Br,OH):Eu2+;
- (Ba,Sr,Ca) MgAl10O17;
- Eu2+;
- (Sr,Ca)10(PO4)6•nB2O3:Eu2+, wherein 0<n<1;
- 2 SrO•0.84 P2O5•0.16 B2O3:Eu2+;
- Sr2Si3O8•2 SrCl2:Eu2+;
- Ba3MgSi2O8:Eu2+;
- Sr4Al14O25:Eu2+;
- BaAl8O13:Eu2+;
- and mixtures thereof;
- said at least a phosphor emitting green light is selected from the group consisting of (Ba,Sr,Ca)MgAl10O17:Eu2+,Mn2+;
- (Ba,Sr,Ca)Al2O4:Eu2+;
- (Y,Gd,Lu,Sc,La)BO3:Ce3+,Tb3+;
- (Ba,Sr,Ca)2SiO4:Eu2+;
- (Ba,Sr,Ca)2(Mg,Zn)Si2O7:Eu2+;
- (Sr,Ca,Ba)(Al,Ga,In)2S4:Eu2+;
- (Y,Gd,Tb,La,Sm,Pr,Lu)x(Al,Ga,In)yO12:Ce3+, wherein x is in the range from about 2.8 to and including 3, and y is n the range from about 4.9 to about 5.1;
- (Sr,Ca,Ba,Mg,Zn)2P2O7:Eu2+,Mn2+;
- (Ca,Sr,Ba,Mg)10(PO4)6(F,Cl,Br,OH):
- Eu2+,Mn2+;
- (Ca,Sr,Ba)8(Mg,Zn)(SiO4)4(Cl,F)2:Eu2+,Mn2+;
- and mixtures thereof;
- and said at least a phosphor emitting red light is selected from the group consisting of (Gd,Y,Lu,La)2O3:Eu3+,Bi3+;
- (Gd,Y,Lu,La)2O2S:Eu3+,Bi3+;
- (Gd,Y,Lu,La)VO4:Eu3+,Bi3+;
- SrS:Eu2+;
- SrY2S4:Eu2+;
- CaLa2S4:Ce3+;
- (Ca,Sr)S:Eu2+;
- 3.5 MgO•0.5 MgF2•GeO2:Mn4+;
- (Ba,Sr,Ca)MgP2O7:Eu2+,Mn2+;
- and mixtures thereof;
- wherein said phosphor composition is disposed to absorb light of at least a portion of said first spectrum and emits light having a second spectrum different from said first spectrum;
- and
- (b) a liquid crystal material disposed to receive light having said second spectrum.
36 more elements
Dependencies are inferred from the claim text.