Aluminate fluorescent material and light emitting device
AssigneeNichia Corporation
InventorsKazuya NISHIMATA, Tomokazu YOSHIDA, Shoji HOSOKAWA
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Abstract
Disclosed are an aluminate fluorescent material having a high light emission intensity, and a light emitting device using the same. The aluminate fluorescent material includes a composition represented by the following formula (I). X1pEutMgqMnrAlsOp+t+q+r+1.5s (I) wherein X1 represents at least one element selected from the group consisting of Ba, Sr, and Ca; and p, q, r, s, and t each satisfy 0.5≤p≤1.0, 0≤q<0.6, 0.4<r≤0.7, 8.5≤s≤13.0, 0<t<0.3, 0.5<p+t≤1.2, and 0.4<q+r≤1.1.
Claims20
An aluminate fluorescent material, comprising:
- an element X1 that contains at least one element selected from the group consisting of Ba, Sr, and Ca,
- Eu,
- Mn,
- Al,
- O, and
- optionally Mg, wherein:
- in a composition of the aluminate fluorescent material, a molar ratio of the element X1 is a parameter p, a molar ratio of the Mg is a parameter q, a molar ratio of the Mn is a parameter r, a molar ratio of the Al is a parameter s, and a molar ratio of the Eu is a parameter t, and:
- p, q, r, s, and t satisfy the following requirements (1) to (7):
- 0.5≤p≤1.0 (1),
- 0≤q<0.6 (2),
- 0.4<r≤0.7 (3),
- 8.5≤s≤13.0 (4),
- 0<t<0.3 (5),
- 0.5<p+t≤1.2 (6), and
- 0.4<q+r≤1.1 (7).
A method for producing an aluminate fluorescent material, comprising:
- preparing a raw material mixture by mixing a compound containing at least one element X1 selected from the group consisting of Ba, Sr and Ca, a compound containing Eu, a compound containing Mn, and a compound containing Al at least containing an oxide, and optionally a compound containing Mg;
- and
- heat treating the raw material mixture to obtain the aluminate fluorescent material:
- wherein
- in a composition of the aluminate fluorescent material, a molar ratio of the element X1 is a parameter p, a molar ratio of the Mg is a parameter q, a molar ratio of the Mn is a parameter r, a molar ratio of the Al is a parameter s, and a molar ratio of the Eu is a parameter t, and:
- p, q, r, s, and t each satisfy the following requirements (1) to (7):
- 0.5≤p≤1.0 (1),
- 0≤q<0.6 (2),
- 0.4<r≤0.7 (3),
- 8.5≤s≤13.0 (4),
- 0<t<0.3 (5),
- 0.5<p+t≤1.2 (6), and
- 0.4<q+r≤1.1 (7).
A method for producing an aluminate fluorescent material, comprising;
- preparing a first mixture by mixing a compound containing at least one element X1 selected from the group consisting of Ba, Sr and Ca, a compound containing Eu, a compound containing Mn, and a compound containing Al at least containing an oxide, and optionally a compound containing Mg,
- first heat treating the first mixture to obtain a first aluminate fluorescent material to be a seed crystal,
- preparing a second mixture by mixing the first aluminate fluorescent material to be a seed crystal, a compound containing at least one element X1 selected from the group consisting of Ba, Sr and Ca, a compound containing Eu, a compound containing Mn, and a compound containing Al at least containing an oxide, and optionally a compound containing Mg;
- and
- second heat treating the second mixture to obtain a second aluminate fluorescent material.
Dependencies are inferred from the claim text.