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 of a phosphor which is 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, the phosphor powder includes phosphor particles in which 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 light absorption A700 of this phosphor powder at a wavelength of 700 nm is equal to or less than 10%.
Claims8
A phosphor powder which is 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 the phosphor powder includes phosphor particles in which 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 light absorption A700 at a wavelength of 700 nm is equal to or less than 10%.
Dependencies are inferred from the claim text.