Cerium and Europium Doped Phosphor Compositions and Light Emitting Devices Including the Same
First Claim
Patent Images
1. A phosphor comprising a compound of Formula I:
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AaBbCcDdEe
(I)wherein A comprises one or more elements selected from the group consisting of Ca, Sr, Ba, Mg, Y, Hf, the lanthanide elements and the alkaline metals;
B comprises Eu and Ce;
C comprises one or more tetrahedrally-coordinated trivalent elements;
D comprises one or more tetrahedrally-coordinated tetravalent elements;
E comprises one or more elements selected from the group consisting of N, O, F, C, S, Cl, Br and I, wherein a+b=1 and c+d=2;
and the compound has a CaAlSiN3-type crystal structure.
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Abstract
Compounds of Formula I, which include both cerium and europium, may be useful as phosphors in solid state light emitting devices. Light emitting devices including such phosphors may emit warm white light.
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Citations
31 Claims
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1. A phosphor comprising a compound of Formula I:
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AaBbCcDdEe
(I)wherein A comprises one or more elements selected from the group consisting of Ca, Sr, Ba, Mg, Y, Hf, the lanthanide elements and the alkaline metals; B comprises Eu and Ce; C comprises one or more tetrahedrally-coordinated trivalent elements; D comprises one or more tetrahedrally-coordinated tetravalent elements; E comprises one or more elements selected from the group consisting of N, O, F, C, S, Cl, Br and I, wherein a+b=1 and c+d=2; and the compound has a CaAlSiN3-type crystal structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A light emitting device, comprising:
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a light emitting element configured to emit light at a wavelength in a range of about 380 nm to about 470 nm; a phosphor configured to absorb at least some of the light emitted from the light emitting element, wherein the phosphor emits light having a maximum emission wavelength in a range of about 500 to about 700 nm; wherein the full width at half maximum of the light emitted from the phosphor is in a range of about 120 to about 200 nm. - View Dependent Claims (31)
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Specification