Red phosphor material and light-emitting device

Patent metadata

Field	Value
Publication number	US-9518220-B2
Application number	US-201514690363-A
Country	US
Kind code	B2
Filing date	Apr 17, 2015
Priority date	Jun 21, 2013
Publication date	Dec 13, 2016
Grant date	Dec 13, 2016

Abstract

A red phosphor material comprising an essential component represented by a formula of ALn 1-x-y Eu x Sm y M 2 O 8 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.

First claim

What is claimed is:

1. A red phosphor material comprising an essential component represented by a formula of ALn 1-x-y Eu x Sm y M 2 O 8 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.

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

3. 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.

4. 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 Li 2 O, Na 2 O, K 2 O, CaCl 2 , SrCl 2 , BaCl 2 , and B 2 O 3 , wherein a content of the addition component relative to an entirety of the red phosphor material is 0.05% to 2.0% by weight.

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

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

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

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

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

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

11. 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.

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 ALn 1-x-y Eu x Sm y M 2 O 8 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.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Inoue Osamu
• Okuyama Kojiro
• Nitta Mitsuru
• Shiraishi Seigo

Classifications

• F21K2/00

  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 · CPC title

• C09K11/7794 Primary

  Vanadates; Chromates; Molybdates; Tungstates · CPC title

• H10H20/8512

  Wavelength conversion materials · CPC title

• H01L33/502

  Electricity · mapped topic