US 12,286,575 B2
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 Dec. 4, 2023, as Appl. No. 18/528,010.
Application 18/528,010 is a continuation of application No. 18/192,687, filed on Mar. 30, 2023, granted, now 11,884,856.
Application 18/192,687 is a continuation of application No. 17/931,632, filed on Sep. 13, 2022, granted, now 11,661,549, issued on May 30, 2023.
Application 17/931,632 is a continuation of application No. PCT/JP2022/031467, filed on Aug. 19, 2022.
Claims priority of application No. 2022-007318 (JP), filed on Jan. 20, 2022; and application No. 2022-007320 (JP), filed on Jan. 20, 2022.
Prior Publication US 2024/0101898 A1, Mar. 28, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. C09K 11/77 (2006.01); F21S 43/16 (2018.01); H01L 33/50 (2010.01); H01L 33/58 (2010.01); H10H 20/851 (2025.01); H10H 20/855 (2025.01)
CPC C09K 11/77346 (2021.01) [C09K 11/7706 (2013.01); C09K 11/77348 (2021.01); F21S 43/16 (2018.01); H10H 20/8513 (2025.01); H10H 20/855 (2025.01)] 16 Claims
OG exemplary drawing
 
1. A light-emitting device, comprising a first light emitter, and a second light emitter that emits visible light due to irradiation with light from the first light emitter,
wherein 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, when the intensity of a peak that appears in a region where 2θ=38-39° in a powder X-ray diffraction spectrum of the phosphor is designated Ix and the intensity of a peak that appears in a region where 2θ=37-38° is designated Iy, the relative intensity Ix/Iy of Ix to Iy is 0.140 or less, and
wherein the phosphor has a short emission peak wavelength of from 620 to 648 nm in an emission spectrum.