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.
Claims7
A method for manufacturing 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,
- the composition having a ratio of a total molar content of the group 2 element and Eu to a molar content of Al of 0.8 or more and 1.1 or less, a molar ratio of Eu of 0.002 or more and 0.08 or less, a molar ratio of Si of 0.8 or more and 1.2 or less, and a total molar ratio of Si and Al of 1.8 or more and 2.2 or less, the method comprising:
- performing a first heat treatment of a raw material mixture containing a group 2 element source, an Eu source, a Si source, and an Al source in a closed container made of tungsten at a temperature of 1200° C. or higher and 1600° C. or lower to obtain a first heat-treated product;
- and
- performing a second heat treatment of the first heat-treated product in a closed container made of tungsten at a temperature of 1800° C. or higher and 2100° C. or lower to obtain a second heat-treated product.
A method for manufacturing 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,
- the composition having a ratio of a total molar content of the group 2 element and Eu to a molar content of Al of 0.8 or more and 1.1 or less, a molar ratio of Eu of 0.002 or more and 0.08 or less, a molar ratio of Si of 0.8 or more and 1.2 or less, and a total molar ratio of Si and Al of 1.8 or more and 2.2 or less, the method comprising:
- performing a heat treatment of a raw material mixture containing a group 2 element source, an Eu source, a Si source, an Al source, and a metal fluoride in a closed container made of tungsten at a temperature of 1800° C. or higher and 2100° C. or lower to obtain a heat-treated product.
Dependencies are inferred from the claim text.