Phosphor, light-emitting device, image display device, and illumination device
View Patent ↗The present invention relates to a phosphor represented by the Formula [1]: M a Sr b Ca c Al d Si e N f , wherein the phosphor includes phosphor particles in which single crystallites are three-dimensionally coupled to each other, the phosphor particles include a crystal grain boundary triple point, and [a total number of the crystal grain boundary triple points (A)]/[the number of the phosphor particles (B)] is 1.0 or less.
1. A phosphor represented by the following Formula [1],
wherein the phosphor comprises phosphor particles in which single crystallites are three-dimensionally coupled to each other, the phosphor particles include a crystal grain boundary triple point, and
[a total number of the crystal grain boundary triple points (A)]/[the number of the phosphor particles (B)] is 1.0 or less,
M a Sr b Ca c Al d Si e N f [1]
(In Formula [1],
M represents an activation element, and
a, b, c, d, e, and f represent values in the following ranges:
0<a≤0.15
0.5≤b<1
0<c<0.5
a+b+c=1
0.7≤d≤1.3
0.7≤e≤1.3
2.5≤f≤3.5).
2. The phosphor according to claim 1 , further comprising oxygen.
3. The phosphor according to claim 1 , having a roundness of 0.6 or greater.
4. A light-emitting device, comprising:
a first light-emitting body; and
a second light-emitting body that emits visible light through irradiation with light from the first light-emitting body,
wherein the second light-emitting body contains one or more kinds of the phosphors according to claim 1 as a first phosphor.
5. An image display device, comprising the light-emitting device according to claim 4 as a light source.
6. An illumination device, comprising the light-emitting device according to claim 4 as a light source.