# US 10,370,589 B2 · Phosphor, light-emitting device, illumination device and image display device

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- Number: US 10,370,589 B2
- Document ID: US10370589B2
- Status: Granted
- Kind: B2
- Application number: 16/010,652
- Filed: 2018-06-18
- Published: 2018-10-25
- Granted: 2019-08-06
- Earliest claimed: 2015-12-18
- Assignees: Mitsubishi Chemical Corporation
- Applicants: Mitsubishi Chemical Corporation
- Inventors: Byungchul Hong; Ayuko Onozuka
- Web page: https://patentgrep.com/patent/US10370589B2

## CPC

- C09K 11/676: {Aluminates; Silicates}
- C09K 11/615: {Halogenides}
- H10H 20/813: having a plurality of light-emitting regions, e.g. multi-junction LEDs or light-emitting devices having photoluminescent regions within the bodies
- H10H 20/822: Materials of the light-emitting regions
- H10H 20/851: Wavelength conversion means
- H10H 20/8512: {Wavelength conversion materials}
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS

## Abstract

The present invention addresses providing a novel narrowband red phosphor having a high internal quantum efficiency, a short afterglow time, and a large number of emission components in a short-wavelength region with high red visibility. This is solved by a phosphor characterized by including a crystalline phase that has a predetermined composition and having a specific peak in a powder X-ray diffraction pattern.

## Claims

### Claim 1

A phosphor including a crystalline phase which has a composition represented by Formula [1] below, and having peaks in regions 1 to 5 shown below in a powder X-ray diffraction pattern measured using CuKα rays (1.5418 Å):
AxDyMnzFw [1]
(in Formula [1],
element A represents one or more elements selected from the group consisting of Li, Na, K, Rb, and Cs,
element D represents two or more elements selected from the group consisting of Si, Ge, and Ti, and
x, y, z, and w each independently are values satisfying formulas below:
1.5≤x≤2.5,
0.5≤y<1,
y+z=1,
5.0≤w≤7.0),
20.7°≤2θ≤21.0°, Region 1:
26.1°≤2θ≤26.7°, Region 2:
34.6°≤2θ≤35.6°, Region 3:
38.3°≤2θ≤39.4°, and Region 4:
49.6°≤2θ≤50.7°. Region 5:

### Claim 2 (depends on 1)

The phosphor according to claim 1, wherein lattice constants a and b of the crystalline phase are 8.88 Å or more and 9.19 Å or less and a lattice constant c is 5.06 Å or more and 5.12 Å or less.

### Claim 3 (depends on 1)

The phosphor according to claim 1, wherein the element A is Na.

### Claim 4 (depends on 1)

The phosphor according to claim 1, wherein the element D is Si and Ti.

### Claim 5 (depends on 1)

The phosphor according to claim 1, which has an emission peak wavelength in a range of 600 nm or more and 650 nm or less when irradiated with excitation light having a wavelength of 350 nm or more and 460 nm or less.

### Claim 6 (depends on 1)

The phosphor according to claim 1, wherein emission peak intensities under irradiation with excitation light having a wavelength of 350 nm or more and 460 nm or less satisfy Formula (1) below:
0.6≤IEP1/IEP2 (1)
(in Formula (1)
IEP1 represents an emission peak intensity at 615 nm to 620 nm,
IEP2 represents an emission peak intensity at 625 nm to 630 nm).

### Claim 7 (depends on 1)

The phosphor according to claim 1, wherein
where a maximum value of an excitation intensity in a wavelength region of 350 nm or more and 550 nm or less in an excitation spectrum is 1, an excitation intensity IG at a wavelength of 500 nm satisfies Formula (2) below:
0.400≤IG≤0.520 (2).

### Claim 8 (depends on 1)

A light-emitting device comprising a first light emitting body and a second light emitting body, which emits visible light under irradiation with light from the first light emitting body, wherein
the second light emitting body includes the phosphor according to claim 1.

### Claim 9 (depends on 8)

An illumination device comprising the light-emitting device according to claim 8 as a light source.

### Claim 10 (depends on 8)

An image display device comprising the light-emitting device according to claim 8 as a light source.

### Claim 11

A phosphor including a crystalline phase which has a composition represented by Formula [1] below, wherein
a crystal system of the crystalline phase is a hexagonal system and a unit cell volume calculated from a lattice constant is 344.0 Å3 or more and 375.0 Å3 or less:
AxDyMnzFw [1]
(in Formula [1],
element A represents one or more elements selected from the group consisting of Li, Na, K, Rb, and Cs,
element D represents two or more elements selected from the group consisting of Si, Ge, and Ti, and
x, y, z, and w each independently are values satisfying formulas below:
1.5≤x≤2.5,
0.5≤y<1,
y+z=1,
5.0≤w≤7.0).

### Claim 12 (depends on 11)

The phosphor according to claim 11, wherein lattice constants a and b of the crystalline phase are 8.88 Å or more and 9.19 Å or less and a lattice constant c is 5.06 Å or more and 5.12 Å or less.

### Claim 13 (depends on 11)

The phosphor according to claim 11, which has an emission peak wavelength in a range of 600 nm or more and 650 nm or less when irradiated with excitation light having a wavelength of 350 nm or more and 460 nm or less.

### Claim 14 (depends on 11)

The phosphor according to claim 11, wherein emission peak intensities under irradiation with excitation light having a wavelength of 350 nm or more and 460 nm or less satisfy Formula (1) below:
0.6≤IEP1/IEP2 (1)
(in Formula (1)
IEP1 represents an emission peak intensity at 615 nm to 620 nm,
IEP2 represents an emission peak intensity at 625 nm to 630 nm).

### Claim 15 (depends on 11)

A light-emitting device comprising a first light emitting body and a second light emitting body, which emits visible light under irradiation with light from the first light emitting body, wherein
the second light emitting body includes the phosphor according to claim 11.

### Claim 16

A phosphor including a crystalline phase which has a composition represented by Formula [1] below, wherein
a ratio (IN/Imax) of an intensity IN of a peak present at 2θ=32° to 33° in a powder X-ray diffraction pattern and a strongest peak intensity Imax in a powder X-ray diffraction pattern measured using CuKα rays (1.5418 Å) is 0.05 or less:
AxDyMnzFw [1]
(in Formula [1],
element A represents one or more elements selected from the group consisting of Li, Na, K, Rb, and Cs,
element D represents two or more elements selected from the group consisting of Si, Ge, and Ti, and
x, y, z, and w each independently are values satisfying formulas below:
1.5≤x≤2.5,
0.5≤y<1,
y+z=1,
5.0≤w≤7.0).

### Claim 17 (depends on 16)

The phosphor according to claim 16, wherein lattice constants a and b of the crystalline phase are 8.88 Å or more and 9.19 Å or less and a lattice constant c is 5.06 Å or more and 5.12 Å or less.

### Claim 18 (depends on 16)

The phosphor according to claim 16, which has an emission peak wavelength in a range of 600 nm or more and 650 nm or less when irradiated with excitation light having a wavelength of 350 nm or more and 460 nm or less.

### Claim 19 (depends on 16)

The phosphor according to claim 16, wherein emission peak intensities under irradiation with excitation light having a wavelength of 350 nm or more and 460 nm or less satisfy Formula (1) below:
0.6≤IEP1/IEP2 (1)
(in Formula (1)
IEP1 represents an emission peak intensity at 615 nm to 620 nm,
IEP2 represents an emission peak intensity at 625 nm to 630 nm).

### Claim 20 (depends on 16)

A light-emitting device comprising a first light emitting body and a second light emitting body, which emits visible light under irradiation with light from the first light emitting body, wherein
the second light emitting body includes the phosphor according to claim 16.