Methods and devices using high efficiency alkaline earth metal thiogallate-based phosphors
First Claim
Patent Images
1. A light emitting device comprising:
- a light output;
a light source producing light including wavelengths of 530 nm or less; and
a wavelength transformer located between the light source and the light output, comprising Sr1-xCaxGa2S4;
yEu2+·
zGa2S3, where x is 0.0001 to 1, y is a value defining sufficient Eu2+ to provide luminescent emission, and z is 0.0001 to 0.2 based on the mole amount of SrxCa1-xGa2S4, the wavelength transformer effective to increase the light at the light output having wavelength between 535 nm and 560 nm.
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Abstract
Provided, among other things, is a light emitting device comprising: a light output; a light source producing light including wavelengths of 530 nm or less; and a wavelength transformer located between the light source and the light output, comprising Sr1-xCaxGa2S4:yEu2+·zGa2S3, where x is 0.0001 to 1, y is a value defining sufficient Eu2+ to provide luminescent emission, and z is 0.0001 to 0.2 based on the mole amount of SrxCa1-xGa2S4, the wavelength transformer effective to increase the light at the light output having wavelength between 535 nm and 560 nm.
34 Citations
20 Claims
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1. A light emitting device comprising:
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a light output;
a light source producing light including wavelengths of 530 nm or less; and
a wavelength transformer located between the light source and the light output, comprising Sr1-xCaxGa2S4;
yEu2+·
zGa2S3, where x is 0.0001 to 1, y is a value defining sufficient Eu2+ to provide luminescent emission, and z is 0.0001 to 0.2 based on the mole amount of SrxCa1-xGa2S4, the wavelength transformer effective to increase the light at the light output having wavelength between 535 nm and 560 nm. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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- 8. The light emitting device of claim 7, wherein the emission peak has a bandwidth of 50 nm or less under excitation with an emission source at 440 nm±
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8-1. A method of making a strontium calcium thiogallate phosphor of formula Sr1-xCaxGa2S4:
- yEu2+·
zGa2S3, where x is 0.0001 to 1, y is a value defining sufficient Eu2+ to provide luminescent emission, and z is 0.0001 to 0.2 based on the mole amount of Sr1-xCaxGa2S4, the method comprising;
forming a composition of sulfate salts of gallium, divalent europium, calcium and, if x is not 1, strontium; and
firing the composition under hydrogen sulfide.
- yEu2+·
Specification