Light emitting device using orange-red phosphor with co-dopants
First Claim
1. A lighting apparatus comprising:
- a light source configured to emit radiation having a wavelength of peak emission between about 360 nm and about 500 nm;
a first phosphor configured to receive at least a portion of the radiation emitted by the light source, wherein the first phosphor has a first wavelength of peak emission between about 495 nm and about 600 nm; and
a second phosphor configured to receive at least a portion of the radiation emitted by the light source, wherein the second phosphor is represented by the formula RE2-x-yCaMg2Si3O12;
Cex,Ay, wherein;
RE is a rare earth metal element selected from the group consisting of Lu, Y, Sc and Tb;
A is a co-dopant selected from the group consisting of Pr, Cr, Mn and Tb;
x is greater than 0 and less than about 1.0; and
y is greater than 0 and less than about 0.2.
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Accused Products
Abstract
Disclosed herein are lighting apparatuses having a light source, a first phosphor, and a second phosphor, wherein the lighting apparatuses exhibit increased R9 values. In some embodiments, the light source is configured to emit radiation having a wavelength of peak emission between about 495 nm and about 500 nm. The first phosphor may have a first wavelength of peak emission between about 495 nm and about 600 nm. The second phosphor may be represented by the formula RE2-x-yCaMg2Si3O12:Cex,Ay. In an embodiment, RE is a rare earth metal; A is a co-dopant, x is greater than 0 and less than about 1.0; and y is greater than 0 and less than about 0.2. Also disclosed are phosphor compositions including the first phosphor and the second phosphor, and methods of using the same.
16 Citations
19 Claims
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1. A lighting apparatus comprising:
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a light source configured to emit radiation having a wavelength of peak emission between about 360 nm and about 500 nm; a first phosphor configured to receive at least a portion of the radiation emitted by the light source, wherein the first phosphor has a first wavelength of peak emission between about 495 nm and about 600 nm; and a second phosphor configured to receive at least a portion of the radiation emitted by the light source, wherein the second phosphor is represented by the formula RE2-x-yCaMg2Si3O12;
Cex,Ay, wherein;RE is a rare earth metal element selected from the group consisting of Lu, Y, Sc and Tb; A is a co-dopant selected from the group consisting of Pr, Cr, Mn and Tb; x is greater than 0 and less than about 1.0; and y is greater than 0 and less than about 0.2. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification