Light-emitting ceramic, light-emitting element, and light-emitting device

Patent metadata

Field	Value
Publication number	US-10000696-B2
Application number	US-201514806707-A
Country	US
Kind code	B2
Filing date	Jul 23, 2015
Priority date	Jan 30, 2013
Publication date	Jun 19, 2018
Grant date	Jun 19, 2018

Abstract

A light-emitting ceramic that contains, as a major component thereof, a pyrochlore compound represented by ABO w , wherein A includes at least one element selected from the group consisting of La, Y, Gd, Yb and Lu, B includes Bi and at least one element selected from the group consisting of Zr, Sn and Hf, and W is a positive number.

First claim

The invention claimed is:

1. A light-emitting ceramic comprising:
a ceramic containing, as a major component thereof, a pyrochlore compound represented by ABO w , wherein
A includes at least one first element, and the at least one first element is selected from the group consisting of La, Y, Gd, Yb and Lu,
B includes at least one second element, and the at least one second element is selected from the group consisting of Zr, Sn and Hf, and at least some of the at least one second element included in the B is substituted with Bi, and
W is a positive number.

2. The light-emitting ceramic according to claim 1 , wherein the Bi in an amount of 0.001 mol % to 5 mol %.

3. The light-emitting ceramic according to claim 1 , wherein the Bi in an amount of 0.01 mol % to 3 mol %.

4. The light-emitting ceramic according to claim 1 , wherein the B Bi in an amount of 0.05 mol % to 1 mol %.

5. The light-emitting ceramic according to claim 1 , wherein a light transmittance in a wavelength of 450 nm to 800 nm when a thickness of the ceramic is 1 mm is 50% or more.

6. The light-emitting ceramic according to claim 1 , wherein a light transmittance in a wavelength of 450 nm to 800 nm when a thickness of the ceramic is 1 mm is 60% or more.

7. The light-emitting ceramic according to claim 1 , wherein a light transmittance in a wavelength of 450 nm to 800 nm when a thickness of the ceramic is 1 mm is 70% or more.

8. The light-emitting ceramic according to claim 1 , wherein an emission quantum yield achieved when the light-emitting ceramic is irradiated with excitation light is 40% or more.

9. The light-emitting ceramic according to claim 1 , wherein an emission quantum yield achieved when the light-emitting ceramic is irradiated with excitation light is 50% or more.

10. The light-emitting ceramic according to claim 1 , wherein an emission quantum yield achieved when the light-emitting ceramic is irradiated with excitation light is 60% or more.

11. The light-emitting ceramic according to claim 1 , wherein the pyrochlore compound is La(Zr (1-x) Bi x )O W , and x is 0.0001 to 0.01.

12. The light-emitting ceramic according to claim 11 , wherein x is 0.0005 to 0.005.

13. The light-emitting ceramic according to claim 1 , wherein the A does not contain Bi.

14. A light-emitting element comprising a wavelength conversion unit containing the light-emitting ceramic according to claim 1 .

15. A light-emitting device comprising:
the light-emitting element according to claim 14 , and
a light source which emits excitation light to the light-emitting element.

16. The light-emitting element according to claim 14 , wherein the wavelength conversion unit is a first wavelength conversion unit, the light-emitting element further comprising a second wavelength conversion unit, the second wavelength conversion unit a different emission wavelength from the first wavelength conversion unit.

17. A light-emitting device comprising:
the light-emitting element according to claim 16 , and
a light source which emits excitation light to the light-emitting element.

18. A light-emitting element comprising:
a first wavelength conversion unit; and
a second wavelength conversion unit,
wherein the first and second wavelength conversion units contain the light-emitting ceramic according to claim 1 .

19. A light-emitting device comprising:
the light-emitting element according to claim 18 , and
a light source which emits excitation light to the light-emitting element.

Assignees

• Murata Manufacturing Co

Inventors

• Kuretake Satoshi

Classifications

• C04B2235/6587

  Influencing the atmosphere by vaporising a solid material, e.g. by using a burying of sacrificial powder · CPC title

• C04B2235/3298

  Bismuth oxides, bismuthates or oxide forming salts thereof, e.g. zinc bismuthate · CPC title

• C04B2235/6585

  at an oxygen percentage above that of air · CPC title

• C04B35/457

  based on tin oxides or stannates · CPC title

• C09K11/7769

  Oxides (C09K11/7768 takes precedence) · CPC title