Wavelength conversion member and light emitting device using the same

Patent metadata

Field	Value
Publication number	US-9605201-B2
Application number	US-201514615426-A
Country	US
Kind code	B2
Filing date	Feb 6, 2015
Priority date	Feb 6, 2014
Publication date	Mar 28, 2017
Grant date	Mar 28, 2017

Abstract

A light emitting device can include a wavelength conversion member with a high light extraction efficiency and capable of achieving a light emitting device with high performance. The wavelength conversion member can include phosphor particles formed from a base material and an activator agent added thereto and having an irregular surface; a matrix material including a light-transmitting material, the matrix material being present between the phosphor particles; and additive particles formed from the base material and adhering to the irregular surface of the phosphor particle to form a particle structure having an irregular surface including a projected section and a recessed section. The difference between the projected section and the recessed section of the irregular surface of the particle structure is larger than the difference between a projected section and a recessed section of the irregular surface of the phosphor particle without the additive particles adhering thereto.

First claim

What is claimed is:

1. A wavelength conversion member comprising:
phosphor particles made of a material including a base material and an activator agent added to the base material, the phosphor particle having an irregular surface including a projected section and a recessed section;
a matrix material including a light-transmitting material, the matrix material being present between the phosphor particles; and
additive particles formed from the same base material as that used for the phosphor particle and adhering to the irregular surface of the phosphor particle so as to coat at least part of the irregular surface of the phosphor particles therewith to form a particle structure having an irregular surface, the irregular surface of the particle structure including a projected section and a recessed section, wherein
a difference between the projected section and the recessed section of the irregular surface of the particle structure in which the phosphor particle is coated with the additive particles is larger than a difference between the projected section and the recessed section of the irregular surface of the phosphor particle without the additive particles adhering thereto.

2. The wavelength conversion member according to claim 1 , wherein the wavelength conversion member has a light incident surface and a light exit surface, and the additive particles are disposed such that the surface of the phosphor particles closer to the light incident surface is covered with the additive particles.

3. The wavelength conversion member according to claim 1 , wherein the base material is a material having a garnet structure.

4. The wavelength conversion member according to claim 2 , wherein the base material is a material having a garnet structure.

5. The wavelength conversion member according to claim 3 , wherein the base material is YAG (yttrium aluminum garnet).

6. The wavelength conversion member according to claim 4 , wherein the base material is YAG (yttrium aluminum garnet).

7. The wavelength conversion member according to claim 1 , wherein the base material is one selected from the group consisting of oxide phosphors, nitride phosphors, and oxynitride phosphors.

8. The wavelength conversion member according to claim 2 , wherein the base material is one selected from the group consisting of oxide phosphors, nitride phosphors, and oxynitride phosphors.

9. The wavelength conversion member according to claim 3 , wherein concentrations in volume of the phosphor particles, the additive particles, and the matrix material have the following relationship,
(Concentration of Phosphor Particles)≦(Concentration of Additive Particles)<(Concentration of Matrix Material).

10. The wavelength conversion member according to claim 4 , wherein concentrations in volume of the phosphor particles, the additive particles, and the matrix material have the following relationship,
(Concentration of Phosphor Particles)≦(Concentration of Additive Particles)<(Concentration of Matrix Material).

11. The wavelength conversion member according to claim 5 , wherein concentrations in volume of the phosphor particles, the additive particles, and the matrix material have the following relationship,
(Concentration of Phosphor Particles)≦(Concentration of Additive Particles)<(Concentration of Matrix Material).

12. The wavelength conversion member according to claim 6 , wherein concentrations in volume of the phosphor particles, the additive particles, and the matrix material have the following relationship,
(Concentration of Phosphor Particles)≦(Concentration of Additive Particles)<(Concentration of Matrix Material).

13. A light emitting device comprising:
a light source having a light emission surface; and
the wavelength conversion member according to claim 1 , the wavelength conversion member being disposed so as to face to the light emission surface.

14. The light emitting device according to claim 13 , wherein the wavelength conversion member has a light incident surface and a light exit surface, and the additive particles are disposed such that the surface of the phosphor particles closer to the light incident surface is covered with the additive particles.

15. The light emitting device according to claim 13 , wherein the base material is a material having a garnet structure.

16. The light emitting device according to claim 14 , wherein the base material is a material having a garnet structure.

17. The light emitting device according to claim 15 , wherein the base material is YAG (yttrium aluminum garnet).

18. The light emitting device according to claim 16 , wherein the base material is YAG (yttrium aluminum garnet).

19. The light emitting device according to claim 13 , wherein the base material is one selected from the group consisting of oxide phosphors, nitride phosphors, and oxynitride phosphors.

20. The light emitting device according to claim 14 , wherein the base material is one selected from the group consisting of oxide phosphors, nitride phosphors, and oxynitride phosphors.

21. The light emitting device according to claim 15 , wherein concentrations in volume of the phosphor particles, the additive particles, and the matrix material have the following relationship,
(Concentration of Phosphor Particles)≦(Concentration of Additive Particles)<(Concentration of Matrix Material).

22. The light emitting device according to claim 16 , wherein concentrations in volume of the phosphor particles, the additive particles, and the matrix material have the following relationship,
(Concentration of Phosphor Particles)≦(Concentration of Additive Particles)<(Concentration of Matrix Material).

23. The light emitting device according to claim 17 , wherein concentrations in volume of the phosphor particles, the additive particles, and the matrix material have the following relationship,
(Concentration of Phosphor Particles)≦(Concentration of Additive Particles)<(Concentration of Matrix Material).

24. The light emitting device according to claim 18 , wherein concentrations in volume of the phosphor particles, the additive particles, and the matrix material have the following relationship,
(Concentration of Phosphor Particles)≦(Concentration of Additive Particles)<(Concentration of Matrix Material).

Assignees

• Stanley Electric Co Ltd

Inventors

• Yamaguchi Yuta

Classifications

• F21V9/32

  characterised by the arrangement of the photoluminescent material · CPC title

• C09K11/7774 Primary

  Aluminates · CPC title

• F21V9/16

  Mechanical Engineering · mapped topic