Nitride phosphor, method for manufacturing the same, and light emitting device
AssigneeNichia Corporation
InventorsShigeyuki Suzuki, Hiroyuki Watanabe, Shoji Hosokawa
Life of this patent
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Abstract
A nitride phosphor having a composition containing Eu, Si, Al, N, and a group 2 element including at least one selected from the group consisting of Mg, Ca, Sr, and Ba. In the composition, a ratio of a total molar content of the group 2 element and Eu to a molar content of Al is 0.8 or more and 1.1 or less, a molar ratio of Eu is 0.002 or more and 0.08 or less, a molar ratio of Si is 0.8 or more and 1.2 or less, and a total molar ratio of Si and Al is 1.8 or more and 2.2 or less. The nitride phosphor has a first peak in a range of 17° 2θ or more and 19° 2θ or less and a second peak in a range of 34° 2θ or more and 35.5° 2θ or less in a CuKα powder X-ray diffraction pattern.
Claims6
A nitride phosphor having a composition containing Eu, Si, Al, N, and a group 2 element comprising at least one selected from the group consisting of Mg, Ca, Sr, and Ba, wherein
- in the composition, a ratio of a total molar content of the group 2 element and Eu to a molar content of Al is 0.8 or more and 1.1 or less, a molar ratio of Eu is 0.002 or more and 0.08 or less, a molar ratio of Si is 0.8 or more and 1.2 or less, and a total molar ratio of Si and Al is 1.8 or more and 2.2 or less, wherein
- the nitride phosphor has a first peak in a range of 17° 2θ or more and 19° 2θ or less and a second peak in a range of 20 is 34° 2θ or more and 35.5° 2θ or less in a powder X-ray diffraction pattern measured by using a CuKα ray, wherein
- an intensity ratio of the second peak to the first peak is 1 or more and 6 or less, and wherein
- a half-value width of the second peak is 0.09° 2θ or more and less than 0.1° 2θ.
Dependencies are inferred from the claim text.