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US 8,119,028 B2Granted
Cerium and europium doped single crystal phosphors
AssigneeCree, Inc.
InventorRonan P. Le Toquin
Life of this patent
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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.
Claims18
A single crystal phosphor preform comprising a single crystal of a material having a compound of Formula I:
- 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 other alkaline earth 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;
- wherein the single crystal phosphor preform comprises a single crystal that is configured to be attached to a light emitting diode.
5 more elements
Dependencies are inferred from the claim text.