Patent ID: 11891554
Assignee: NATIONAL INSTITUTE FOR MATERIALS SCIENCE
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC C  F  H  Y | IPC C  F  H

Claim 0:
1. An illumination device, comprising a light-emitting device as a light source,
wherein the light-emitting device comprises a first light emitter and a second light emitter that emits visible light due to irradiation with light from the first light emitter, and the second light emitter includes a phosphor that includes a crystal phase having a composition represented by formula [1] below,

RexMAaMBbMCcNdXe  [1]

wherein in formula [1] above,
MA includes one or more elements selected from the group consisting of Sr, Ca, Ba, Na, K, Y, Gd, and La,
MB includes one or more elements selected from the group consisting of Li, Mg, and Zn,
MC includes one or more elements selected from the group consisting of Al, Si, Ga, In, and Sc,
X includes one or more elements selected from the group consisting of F, Cl, Br, and I,
Re includes one or more elements selected from the group consisting of Eu, Ce, Pr, Tb, and Dy, and
a, b, c, d, e, and x satisfy the following expressions, respectively,
0.7≤a≤1.3
0.7≤b≤1.3
2.4≤c≤3.6
3.2≤d≤4.8
0.0≤e≤0.2
0.0<x≤0.2,
wherein a minimum reflectance of the phosphor in a prescribed wavelength region is 20% or more, and the prescribed wavelength region is a region from the emission peak wavelength of the phosphor to 800 nm, and
wherein the phosphor has a short emission peak wavelength of from 620 to 648 nm in an emission spectrum.