US 11,655,416 B1
Phosphor, light-emitting device, illumination device, image display device, and indicator lamp for vehicle
Tomoyuki Kurushima, Tokyo (JP); Yuhei Inata, Tokyo (JP); and Naoto Hirosaki, Ibaraki (JP)
Assigned to Mitsubishi Chemical Corporation, Tokyo (JP); and NATIONAL INSTITUTE FOR MATERIALS SCIENCE, Tsukuba (JP)
Filed by Mitsubishi Chemical Corporation, Tokyo (JP); and NATIONAL INSTITUTE FOR MATERIALS SCIENCE, Tsukuba (JP)
Filed on Sep. 13, 2022, as Appl. No. 17/931,641.
Application 17/931,641 is a continuation of application No. PCT/JP2022/031466, filed on Aug. 19, 2022.
Claims priority of application No. JP2022-007317 (JP), filed on Jan. 20, 2022; and application No. JP2022-007319 (JP), filed on Jan. 20, 2022.
Int. Cl. H01L 33/50 (2010.01); H01L 33/58 (2010.01); C09K 11/77 (2006.01); F21V 9/30 (2018.01); F21S 43/16 (2018.01); F21W 103/20 (2018.01); H01L 33/60 (2010.01)
CPC C09K 11/77346 (2021.01) [C09K 11/7706 (2013.01); C09K 11/77348 (2021.01); F21S 43/16 (2018.01); F21V 9/30 (2018.02); H01L 33/504 (2013.01); F21W 2103/20 (2018.01); H01L 33/60 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A light-emitting device comprising a phosphor,
wherein the phosphor includes a crystal phase having a composition represented by formula [2] below, and
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,
RexMAaMBb(MC′1−yMDy)cNdXe  [2]
wherein in formula [2] 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′ is Al,
MD includes one or more elements selected from the group consisting of 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, x, and y 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
0.0<y≤1.0.