Phosphor, light-emitting apparatus including the same, and phosphor production method
First Claim
1. A phosphor represented by the general formula MxCeySi6-zBzN8+w, whereinM is at least one element selected from the group consisting of La, Y, Tb and Lu,2.0<
- w<
4.0,2.0<
x<
3.5,0<
y<
1.0, and0<
z<
2.0.
1 Assignment
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Accused Products
Abstract
A phosphor is provided which is represented by the general formula MxCeySi6-zBzN8+w. M is at least one element selected from the group consisting of La, Y, Tb and Lu. And w, x, y, and z satisfy 2.0<w<4.0, 2.0<x<3.5, 0<y<1.0, and 0<z<2.0, respectively. The phosphor can be efficiently excited by light in a range from near-ultraviolet to blue light, and emit light having components that widely extend mainly from green range to yellow range. A light-emitting apparatus includes the phosphor together with a light-emitting device that emits light in a range from near-ultraviolet to blue light, and can have improved light emission efficiency, good color rendering property, and good color reproduction range. In the case where a light-emitting apparatus includes an additional phosphor, it is possible to further improve its light emission spectrum.
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Citations
17 Claims
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1. A phosphor represented by the general formula MxCeySi6-zBzN8+w, wherein
M is at least one element selected from the group consisting of La, Y, Tb and Lu, 2.0< - w<
4.0,2.0<
x<
3.5,0<
y<
1.0, and0<
z<
2.0. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 13, 14, 15, 16, 17)
- w<
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9. A phosphor production method, comprising:
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preparing, pulverizing and mixing materials for elements to compose a composition of phosphor the materials including the elements themselves, or oxide, nitride or carbonate of the elements, so as to provide obtained materials; filling a crucible with the obtained materials, and burning the obtained materials in a reducing atmosphere, so as to form a burned product; and pulverizing the burned product, thereby obtaining phosphor powder, wherein said composition of phosphor is represented by the general formula MxCeySi6-zBzN8+w, wherein M is at least one element selected from the group consisting of La, Y, Tb and Lu, and 2.0<
w<
4.0, 2.0<
x<
3.5, 0<
y<
1.0 and 0<
z<
2.0. - View Dependent Claims (10, 11, 12)
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Specification