# US 11,114,589 B2 · Fluoride phosphor and light-emitting device using same

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- Number: US 11,114,589 B2
- Document ID: US11114589B2
- Status: Granted
- Kind: B2
- Application number: 16/622,783
- Filed: 2018-06-12
- Published: 2020-04-30
- Granted: 2021-09-07
- Earliest claimed: 2017-06-14
- Assignees: Denka Company Limited
- Applicants: Denka Company Limited
- Inventors: Masayoshi Ichikawa; Ryosuke Kondo; Hideyuki Emoto
- Web page: https://patentgrep.com/patent/US11114589B2

## CPC

- C09K 11/665: {with alkali or alkaline earth metals}
- H10H 20/8512: {Wavelength conversion materials}
- C09K 11/616: {with alkali or alkaline earth metals}
- C09K 11/675: {with alkali or alkaline earth metals}
- H10H 20/822: Materials of the light-emitting regions
- Y02B 20/00: Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

Provided is a fluoride phosphor that has a good external quantum efficiency and is suitable for stably producing white LEDs. The fluoride phosphor has a composition represented by a general formula (1) and a repose angle of 30° or more and 60° or less. general formula: A2M(1-n)F6:Mn4+n (1), wherein 0<n≤0.1, the element A is one or more alkali metal elements including at least K, and the element M is a simple substance of Si, a simple substance of Ge, or a combination of Si and one or more elements selected from the group consisting of Ge, Sn, Ti, Zr, and Hf.

## Claims

### Claim 1

A fluoride phosphor having a composition represented by a following general formula (1) and a repose angle of 30° or more and 60° or less:
A2M(1-n)F6:Mn4+n formula (1)
wherein 0<n≤0.1; an element A is one or more alkali metal elements containing at least K; and an element M is a simple substance of Si, a simple substance of Ge, or a combination of Si and one or more elements selected from the group consisting of Ge, Sn, Ti, Zr, and Hf;
wherein a bulk density of the fluoride phosphor is 1.00 g/cm3 or more and 1.40 g/cm3 or less, and
wherein a mass median diameter (D50) of the fluoride phosphor is 29 μm or less.

### Claim 2 (depends on 1)

The fluoride phosphor according to claim 1, wherein in the general formula (1), the element A is a simple substance of K and the element M is a simple substance of Si.

### Claim 3 (depends on 1)

The fluoride phosphor according to claim 1, wherein a span value is 1.5 or less, as calculated by the following formula (2) using a 10% diameter (D10), a mass median diameter (D50), and a 90% diameter (D90) obtained from a mass-based cumulative distribution curve:
(span value)=(D90−D10)/D50 formula (2)

### Claim 4 (depends on 1)

A light emitting device comprising:
the fluoride phosphor according to claim 1; and
a light emitting source.

### Claim 5 (depends on 4)

The light emitting device according to claim 4, wherein a peak wavelength of the light emitting source is 420 nm or more and 480 nm or less.

### Claim 6 (depends on 4)

The light emitting device according to claim 4, wherein the light emitting device is a white LED device.