White light LED device
First Claim
1. A lighting apparatus comprising:
- a semiconductor light source emitting radiation having a wavelength in the range of from about 460 to about 470 nm;
a phosphor comprising Ca8Mg(SiO4)4Cl2;
Eu2+,Mn2+ radiationally coupled to the semiconductor light source;
wherein the phosphor is capable of absorbing the radiation emitted by the semiconductor light source and converting the radiation into white light.
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Accused Products
Abstract
A light source including a specific LED and phosphor combination capable of emitting white light for direct illumination. In one embodiment, the light source includes an LED chip emitting in the 460-470 nm range radiationally coupled to a phosphor comprising Ca8Mg(SiO4)4Cl2:Eu2+,Mn2+. In a second embodiment, the light source includes an LED chip emitting at about 430 nm and a phosphor comprising a blend of Sr4Al14O25:Eu2+ (SAE) and a second phosphor having the formula(Tb1-x-yAxREy)3DzO12, where A is a member selected from the group consisting of Y, La, Gd, and Sm; RE is a member selected from the group consisting of Ce, Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, and Lu; D is a member selected from the group consisting of Al, Ga, and In; x is in the range from 0 to about 0.5, y is in the range from about 0 to about 0.2, and z is in the range from about 4 to about 5. Both embodiments produce light having the coordinates x=0.240-0.260 and y=0.340-0.360 on the CIE chromaticity diagram.
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Citations
19 Claims
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1. A lighting apparatus comprising:
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a semiconductor light source emitting radiation having a wavelength in the range of from about 460 to about 470 nm;
a phosphor comprising Ca8Mg(SiO4)4Cl2;
Eu2+,Mn2+ radiationally coupled to the semiconductor light source;
wherein the phosphor is capable of absorbing the radiation emitted by the semiconductor light source and converting the radiation into white light. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A lighting apparatus comprising:
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a semiconductor light source emitting radiation having a wavelength in the range of about 430 nm;
a phosphor blend comprising Sr4Al14O25;
Eu2+ (SAE) and a second phosphor having the formula(Tb1-x-yAxREy)3DzO12, where A is a member selected from the group consisting of Y, La, Gd, and Sm;
RE is a member selected from the group consisting of Ce, Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, and Lu;
D is a member selected from the group consisting of Al, Ga, and In;
x is in the range from 0 to about 0.5, y is in the range from about 0 to about 0.2, and z is in the range from about 4 to about 5;
the phosphor blend radiationally coupled to the semiconductor light source;
wherein the phosphor is capable of absorbing the radiation emitted by the semiconductor light source and converting the radiation into white light. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for forming a lighting apparatus, the method comprising the steps of:
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providing a blue LED capable of emitting radiation having a wavelength of about 430 nm;
radiationally coupling a phosphor comprising Ca8Mg(SiO4)4Cl2;
Eu2+,Mn2+ to the semiconductor light source;
wherein the phosphor is capable of absorbing the radiation emitted by the semiconductor light source and converting the radiation into white light having the coordinates x=0.240-0.260 and y=0.340-0.360 on the CIE chromaticity diagram
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19. Method for forming a lighting apparatus, the method comprising the steps of:
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providing a blue LED capable of emitting radiation having a wavelength of from about 460 to about 470 nm;
radiationally coupling a phosphor blend comprising Sr4Al14O25;
Eu2+ (SAE) and a second phosphor having the formula(Tb1-x-yAxREy)3DzO12, where A is a member selected from the group consisting of Y, La, Gd, and Sm;
RE is a member selected from the group consisting of Ce, Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, and Lu;
D is a member selected from the group consisting of Al, Ga, and In;
x is in the range from 0 to about 0.5, y is in the range from about 0 to about 0.2, and z is in the range from about 4 to about 5, to the semiconductor light source;
wherein the phosphor is capable of absorbing the radiation emitted by the semiconductor light source and converting the radiation into white light having the coordinates x=0.240-0.260 and y=0.340-0.360 on the CIE chromaticity diagram.
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Specification