Red phosphor material and light-emitting device

Patent metadata

Field	Value
Publication number	US-9644142-B2
Application number	US-201514690355-A
Country	US
Kind code	B2
Filing date	Apr 17, 2015
Priority date	Jun 21, 2013
Publication date	May 9, 2017
Grant date	May 9, 2017

Abstract

A red phosphor material includes an essential component represented by a formula of A 2-2x R x Eu y Sm z Ln x-y-z M 2 O 8 as a main component, where A represents at least one selected from Ca and Sr; R represents at least one selected from Li, Na, and K; Ln represents at least one selected from La, Gd, and Y; M represents at least one selected from W and Mo; and x, y, and z are numerical values that satisfy 0.2≦x≦0.7, 0.2≦y+z≦0.6, 0.005≦z≦0.04, and x−y−z≧0. 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 A 2-2x R x Eu y Sm z Ln x-y-z M 2 O 8 as a main component; and
an excess component that is at least one selected from Li 2 O, Na 2 O, and K 2 O,
where A represents at least one selected from Ca and Sr; R represents at least one selected from Li, Na, and K; Ln represents at least one selected from La, Gd, and Y; M represents at least one selected from W and Mo; and x, y, and z are numerical values that satisfy 0.2≦x≦0.7, 0.2≦y+z≦0.6, 0.005≦z≦0.04, and x−y−z≧0,
wherein a content of the excess component relative to an entirety of the red phosphor material is 0.05% to 2.0% by weight.

2. The red phosphor material according to claim 1 , further comprising an addition component that is at least one selected from CaCl 2 , SrCl 2 , BaCl 2 , LiF, and ZnF 2 , wherein a content of the excess component and the addition component relative to an entirety of the red phosphor material is 0.05% to 2.0% by weight.

3. The red phosphor material according to claim 2 , consisting essentially of the essential component, the excess component and the addition component.

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

5. The red phosphor material according to claim 1 , being a sinter.

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

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

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

9. 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 85% or more.

10. A red phosphor material comprising:
an essential component represented by a formula of A 2-2x R x Eu y Sm z Ln x-y-z M 2 O 8 as a main component; and
an addition component that is at least one selected from CaCl 2 , SrCl 2 , BaCl 2 , LiF, and ZnF 2 , wherein a content of the addition component relative to an entirety of the red phosphor material is 0.05% to 2.0% by weight,
where A represents at least one selected from Ca and Sr; R represents at least one selected from Li, Na, and K; Ln represents at least one selected from La, Gd, and Y; M represents at least one selected from W and Mo; and x, y, and z are numerical values that satisfy 0.2≦x≦0.7, 0.2≦y+z≦0.6, 0.005≦z≦0.04, and x−y−z≧0.

11. The red phosphor material according to claim 10 , consisting essentially of the essential component and the addition component.

12. The red phosphor material according to claim 10 , wherein Ln represents Gd.

13. The red phosphor material according to claim 10 , wherein M represents W.

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

15. The red phosphor material according to claim 10 , 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 85% or more.

16. A red phosphor material comprising:
an essential component represented by a formula of A 2-2x R x Eu y Sm 2 Ln x-y-z M 2 O 8 as a main component,
where A represents at least one selected from Ca and Sr; R represents at least one selected from Li, Na, and K; Ln represents at least one selected from La, Gd, and Y; M represents at least one selected from W and Mo; and x, y, and z are numerical values that satisfy 0.2≦x≦0.7, 0.2≦y+z≦0.6, 0.005≦z≦0.04, and x−y−z≧0,
wherein x−y−z≧0.1.

17. The red phosphor material according to claim 16 , consisting essentially of the essential component.

18. The red phosphor material according to claim 16 , wherein Ln represents Gd.

19. The red phosphor material according to claim 16 , wherein M represents W.

20. The red phosphor material according to claim 16 , wherein R represents at least one selected from Li and Na.

21. The red phosphor material according to claim 16 , 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 85% or more.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

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

Classifications

• H01L33/502

  Electricity · mapped topic

• C04B35/495

  based on vanadium, niobium, tantalum, molybdenum or tungsten oxides or solid solutions thereof with other oxides, e.g. vanadates, niobates, tantalates, molybdates or tungstates · CPC title

• C09K11/7794 Primary

  Vanadates; Chromates; Molybdates; Tungstates · CPC title

• 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

• H10H20/8512

  Wavelength conversion materials · CPC title