CPC C09K 11/77348 (2021.01) [B22F 3/1017 (2013.01); C09K 11/7731 (2013.01); C09K 11/7739 (2013.01); C09K 11/77346 (2021.01); C09K 11/77347 (2021.01)] | 7 Claims |
1. 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.
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