Phosphor powder, light-emitting device, image display device, and illumination device
AssigneeDenka Company Limited
InventorHideyuki Emoto
Life of this patent
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Abstract
A phosphor powder including phosphor particles which are a phosphor represented by a general formula Mx(Si, Al)2(N, O)3±y (where M is Li and one or more alkaline earth metal elements and 0.52≤x≤0.9 and 0.06≤y≤0.36 are satisfied) and in which a part of M is substituted with a Ce element, wherein a Si/Al atomic ratio is equal to or more than 1.5 and equal to or less than 6, an O/N atomic ratio is equal to or more than 0 and equal to or less than 0.1, 5 to 50 mol % of M is Li, and 0.5 to 10 mol % of M is Ce, and a total content of a Cr element, a Fe element, and a Ni element in the phosphor powder is equal to or less than 20.0 ppm.
Claims6
A phosphor powder including phosphor particles which are a phosphor represented by a general formula Mx(Si, Al)2(N, O)3±y (where M is Li and one or more alkaline earth metal elements and 0.52≤x≤0.9 and 0.06≤y≤0.36 are satisfied) and in which a part of M is substituted with a Ce element,
- wherein a Si/Al atomic ratio is equal to or more than 1.5 and equal to or less than 6,
- an O/N atomic ratio is equal to or more than 0 and equal to or less than 0.1,
- 5 to 50 mol % of M is Li, and
- 0.5 to 10 mol % of M is Ce,
- a total content of a Cr element, a Fe element, and a Ni element in the phosphor powder is from 0.01 ppm or more to 10 ppm or less, and
- a content of the Cr element in the phosphor powder is equal to or less than 3 ppm, and
- a D10 of the phosphor powder is from 2 μm or more to 15 μm or less.
Dependencies are inferred from the claim text.