Fluoride phosphor and light-emitting device using same
AssigneeDenka Company Limited
InventorsMasayoshi Ichikawa, Ryosuke Konda, Hideyuki Emoto
Life of this patent
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Abstract
Provided is a fluoride phosphor that has a good external quantum efficiency and is suitable for stably producing white LEDs. The fluoride phosphor having a composition represented by a general formula (1), a bulk density of 0.80 g/cm3 or more, and a mass median diameter (D50) of 30 μm or less: general formula: A2M(1-n)F6:Mn4+n (1), wherein 0<n≤0.1, the element A is one or more alkali metal elements including at least K, and the element M is a simple substance of Si, a simple substance of Ge, or a combination of Si and one or more elements selected from the group consisting of Ge, Sn, Ti, Zr, and Hf.
Claims7
A fluoride phosphor having a composition represented by a general formula (1), a bulk density of 1.00 g/cm3 or more, and a mass median diameter (D50) of 29 μm or less:
- A2M(1-n)F6:Mn4+n (Formula 1)
- wherein 0<n≤0.1;
- an element A is one or more alkali metal elements containing at least K;
- and an element M is a simple substance of Si, a simple substance of Ge, or a combination of Si and one or more elements selected from the group consisting of Ge, Sn, Ti, Zr, and Hf.
Dependencies are inferred from the claim text.