# US 9,518,220 B2 · Red phosphor material and light-emitting device

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- Number: US 9,518,220 B2
- Document ID: US9518220B2
- Status: Granted
- Kind: B2
- Application number: 14/690,363
- Filed: 2015-04-17
- Published: 2015-08-06
- Granted: 2016-12-13
- Earliest claimed: 2013-06-21
- Assignees: Panasonic Intellectual Property Management Co., Ltd.
- Applicants: Panasonic Intellectual Property Management Co., Ltd.
- Inventors: Osamu Inoue; Kojiro Okuyama; Mitsuru Nitta; Seigo Shiraishi
- Web page: https://patentgrep.com/patent/US9518220B2

## CPC

- C09K 11/7794: {Vanadates; Chromates; Molybdates; Tungstates}
- F21K 2/00: Non-electric light sources using luminescence (using excitation by radioactivity G21H3/02, H01J65/06, H01J65/08; using excitation by an external electromagnetic field or by external corpuscular radiation H01J65/04); Light sources using electrochemiluminescence
- H10H 20/8512: {Wavelength conversion materials}
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- F21K: NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS

## Abstract

A red phosphor material comprising an essential component represented by a formula of ALn1-x-yEuxSmyM2O8 as a main component, where A represents at least one selected from Li, Na, and K; Ln represents at least one selected from La and Gd; M represents at least one selected from W and Mo; and x and y are numerical values that satisfy 0.1≦x+y≦0.7 and 0.005≦y≦0.08. A light-emitting device includes an excitation light source and the red phosphor material that absorbs excitation light emitted by the excitation light source and emits red light.

## Claims

### Claim 1

A red phosphor material comprising an essential component represented by a formula of ALn1-x-yEuxSmyM2O8 as a main component,
where A represents at least one selected from Li, Na, and K; Ln represents at least one selected from La and Gd; M represents at least one selected from W and Mo; and x and y are numerical values that satisfy 0.1≦x+y≦0.7 and 0.005≦y≦0.08.

### Claim 2 (depends on 1)

The red phosphor material according to claim 1, wherein x and y satisfy 0.2≦x+y≦0.7.

### Claim 3 (depends on 1)

The red phosphor material according to claim 1, wherein x and y satisfy 0.2≦x+y≦0.6 and 0.005≦y≦0.04.

### Claim 4 (depends on 1)

The red phosphor material according to claim 1, further comprising, in addition to the essential component, an addition component that is at least one selected from Li2O, Na2O, K2O, CaCl2, SrCl2, BaCl2, and B2O3, wherein a content of the addition component relative to an entirety of the red phosphor material is 0.05% to 2.0% by weight.

### Claim 5 (depends on 4)

The red phosphor material according to claim 4, consisting essentially of the essential component and the addition component.

### Claim 6 (depends on 4)

The red phosphor material according to claim 4, being a sinter.

### Claim 7 (depends on 1)

The red phosphor material according to claim 1, consisting essentially of the essential component.

### Claim 8 (depends on 1)

The red phosphor material according to claim 1, wherein Ln represents Gd.

### Claim 9 (depends on 1)

The red phosphor material according to claim 1, wherein M represents W.

### Claim 10 (depends on 1)

The red phosphor material according to claim 1, wherein A represents at least one selected from Li and Na.

### Claim 11 (depends on 1)

The red phosphor material according to claim 1, wherein a ratio of a luminance of emitted light at a wavelength of 615 nm as a result of excitation with light having a wavelength of 405 nm at 200° C. to a luminance of emitted light at a wavelength of 615 nm as a result of excitation with light having a wavelength of 405 nm at 30° C. is 80% or more.

### Claim 12

A light-emitting device comprising an excitation light source and a red phosphor material that absorbs excitation light emitted by the excitation light source and emits red light, the red phosphor material comprising an essential component represented by a formula of ALn1-x-yEuxSmyM2O8 as a main component,
where A represents at least one selected from Li, Na, and K; Ln represents at least one selected from La and Gd; M represents at least one selected from W and Mo; and x and y are numerical values that satisfy 0.1≦x+y≦0.7 and 0.005≦y≦0.08.