Ceramic complex, light emitting device using the same, and method for producing ceramic complex
AssigneeNichia Corporation
InventorsMasaki Kondo, Yasuaki Mashima
Life of this patent
Estimating the term…
Abstract
Provided is a ceramic complex having high luminous characteristics. Proposed is a ceramic complex including a rare earth aluminate fluorescent material, glass, and calcium fluoride, wherein, when the total amount of the rare earth aluminate fluorescent material, the glass, and the calcium fluoride is taken as 100% by volume, the content of the rare earth aluminate fluorescent material is in a range of 15% by volume or more and 60% by volume or less, the content of the glass is in a range of 3% by volume or more and 84% by volume or less, and the content of the calcium fluoride is in a range of 1% by volume or more and 60% by volume of less.
Claims12
A ceramic complex, comprising a rare earth aluminate fluorescent material, glass, and calcium fluoride,
- wherein, when the total amount of the rare earth aluminate fluorescent material, the glass, and the calcium fluoride is taken as 100% by volume, the content of the rare earth aluminate fluorescent material is in a range of 18% by volume or more and 60% by volume or less, the content of the glass is in a range of 3% by volume or more and 84% by volume or less, and the content of the calcium fluoride is in a range of 10% by volume or more and 60% by volume of less,
- wherein the calcium fluoride is a plurality of single crystals having a purity of calcium fluoride of 99.0% by mass and
- the calcium fluoride has a lower refractive index than the glass,
- wherein a composition of the rare earth aluminate fluorescent material is represented by the following formula (I):
- (Ln1-aCea)3(AlcGab)5O12 (I)
- wherein Ln represents at least one element selected from the group consisting of Y, Gd, Lu, and Tb;
- and a, b, and c each satisfy 0<a≤0.022, 0≤b≤0.4, 0<c≤1.1, and 0.9≤b+c≤1.1.
A method for producing a ceramic complex, comprising:
- preparing a molded body containing a rare earth aluminate fluorescent material, glass, and calcium fluoride, wherein the content of the rare earth aluminate fluorescent material is in a range of 18% by volume or more and 60% by volume or less, the content of the glass is in a range of 3% by volume or more and 84% by volume or less, and the content of the calcium fluoride is in a range of 10% by volume or more and 60% by volume of less, relative to the total amount of the rare earth aluminate fluorescent material, the glass, and the calcium fluoride by volume;
- and
- calcining the molded body,
- wherein calcium fluoride is a plurality of single crystals having a purity of calcium fluoride of 99.0% by mass and
- the calcium fluoride has a lower refractive index than the glass,
- wherein a composition of the rare earth aluminate fluorescent material is represented by the following formula (I):
- (Ln1-aCea)3(AlcGab)5O12 (I)
- wherein Ln represents at least one element selected from the group consisting of Y, Gd, Lu, and Tb;
- and a, b, and c each satisfy 0<a≤0.022, 0≤b≤0.4, 0<c≤1.1, and 0.9≤b+c≤1.1.
Dependencies are inferred from the claim text.