Method for producing light wavelength conversion member, light wavelength conversion member, light wavelength conversion component and light emitting device

Patent metadata

Field	Value
Publication number	US-11063186-B2
Application number	US-201716343188-A
Country	US
Kind code	B2
Filing date	Oct 24, 2017
Priority date	Oct 28, 2016
Publication date	Jul 13, 2021
Grant date	Jul 13, 2021

Abstract

A method for producing an optical wavelength conversion member ( 9 ) composed of a sintered body containing, as main components, Al 2 O 3 and a component represented by formula A 3 B 5 O 12 :Ce; an optical wavelength conversion member; an optical wavelength conversion component including the optical wavelength conversion member; and a light-emitting device including the optical wavelength conversion member or the optical wavelength conversion component. The production method of the sintered body includes firing in a firing atmosphere having a pressure of 10 4 Pa or more and an oxygen concentration of 0.8 vol. % or more and less than 25 vol. %.

First claim

The invention claimed is:

1. An optical wavelength conversion member comprising a sintered body containing, as main components, Al 2 O 3 and a component represented by formula A 3 B 5 O 12 :Ce (wherein A and B are elements), the optical wavelength conversion member being characterized in that:
the sintered body exhibits a relative concentration ratio (Cout/Alout)/(Cin/Alin) of 1.0 to 2, wherein (Cin/Alin) represents the ratio of the number of C atoms (Cin) to the number of Al atoms (Alin) in a cross section at a center portion of the sintered body, and (Cout/Alout) represents the ratio of the number of C atoms (Cout) to the number of Al atoms (About) in a cross section at an end portion of the sintered body.

2. An optical wavelength conversion component, characterized by comprising an optical wavelength conversion member as recited in claim 1 , and a support member which is made of a metal and supports the optical wavelength conversion member, wherein the support member has a thermal conductivity higher than the thermal conductivity of the optical wavelength conversion member.

3. An optical wavelength conversion component according to claim 2 , wherein the support member is formed of a frame body, and the optical wavelength conversion member is fixed in the frame body.

4. A method for producing the optical wavelength conversion member according to claim 1 , the method being characterized by comprising:
producing the sintered body through firing in a firing atmosphere having a pressure of 10 4 Pa or more and an oxygen concentration of 0.8 vol. % or more and less than 25 vol. %.

5. A method for producing an optical wavelength conversion member according to claim 4 , wherein the sintered body has an A 3 B 5 O 12 :Ce content of 3 to 70 vol. %, and the A 3 B 5 O 12 :Ce is composed of polycrystalline grains formed through eutectic segregation in Al 2 O 3 during the firing.

6. A method for producing an optical wavelength conversion member according to claim 4 , wherein the sintered body has a garnet structure represented by A 3 B 5 O 12 :Ce, wherein each of A and B is at least one element selected from the following element groups:
A: Sc, Y, and lanthanoids (except for Ce), and
B: Al and Ga.

7. A method for producing an optical wavelength conversion member according to claim 4 , wherein the Ce content of the A 3 B 5 O 12 :Ce is 5 mol % or less (exclusive of 0) relative to the element A.

8. A light-emitting device, characterized by comprising an optical wavelength conversion member as recited in claim 1 .

9. A light-emitting device, characterized by comprising an optical wavelength conversion component as recited in claim 2 .

10. A light-emitting device, characterized by comprising an optical wavelength conversion component as recited in claim 3 .

Assignees

• Ngk Spark Plug Co

Inventors

• Katsu Yusuke
• TAKAKU Shohei
• Ito Tsuneyuki
• Mitsuoka Takeshi
• Moteki Jun

Classifications

• C09K11/7774

  Aluminates · CPC title

• H10H20/851

  Wavelength conversion means · CPC title

• H10H20/0361

  of wavelength conversion means · CPC title

• H10H20/8514

  characterised by their shape, e.g. plate or foil · CPC title

• H10H20/8506

  Containers · CPC title