Aluminate fluorescent material, light emitting device, and method for producing aluminate fluorescent material
AssigneeNichia Corporation
InventorsKazuya NISHIMATA, Tomokazu YOSHIDA, Shoji HOSOKAWA
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Abstract
Provided are an aluminate fluorescent material, a light emitting device, and a method for producing an aluminate fluorescent material. The aluminate fluorescent material, having an aluminate composition containing: at least one alkaline earth metal element selected from the group consisting of Ba, Sr, and Ca; Mn; and optionally Eu and/or Mg, wherein the fluorine content in the aluminate fluorescent material is 100 ppm or more and 7,000 ppm or less, and the average particle diameter of the aluminate fluorescent material, which is measured according to a Fisher Sub-Sieve Sizer method, is 8 μm or more.
Claims15
An aluminate fluorescent material, comprising an aluminate composition comprising:
- at least one alkaline earth metal element selected from the group consisting of Ba, Sr, and Ca;
- Mn;
- and
- optionally Eu and/or Mg,
- wherein a fluorine content in the aluminate fluorescent material is in a range of 100 ppm or more and 7,000 ppm or less, and
- wherein an average particle diameter of the aluminate fluorescent material, which is measured according to a Fisher Sub-Sieve Sizer method, is 8 μm or more.
A method for producing an aluminate fluorescent material, comprising:
- mixing a compound containing at least one alkaline earth metal element selected from the group consisting of Ba, Sr, and Ca, a compound containing Mn, optionally a compound containing Eu, a compound containing Al, optionally a compound containing Mg, a first flux, which is a fluoride containing at least one alkaline metal element selected from the group consisting of Na, K, Rb, and Cs, and a second flux, which is a fluoride containing at least one element selected from the group consisting of Ba, Sr, Ca, Mg, and Al, wherein the fluoride is different from the compound containing the alkaline earth metal element, the compound containing Mg, and the compound containing Al, excluding the case where the first flux is a fluoride containing K and the second flux is a fluoride containing Al, to obtain a mixture in which the fluoride content is in a range of 3,000 ppm or more and 15,500 ppm or less;
- and
- heat-treating the mixture.
A method for producing an aluminate fluorescent material, comprising:
- mixing a compound containing at least one alkaline earth metal element selected from the group consisting of Ba, Sr, and Ca, a compound containing Mn, optionally a compound containing Eu, a compound containing Al, optionally a compound containing Mg, a first flux, which is a fluoride containing K, and a second flux, which is a fluoride containing Al, wherein the fluoride is different from the compound containing Al, to obtain a mixture, in which the fluoride content is in a range of 3,000 ppm or more and 8,500 ppm or less;
- and
- heat-treating the mixture.
Dependencies are inferred from the claim text.