Yellow luminophore and light source

Patent metadata

Field	Value
Publication number	US-11920071-B2
Application number	US-202017616689-A
Country	US
Kind code	B2
Filing date	Jun 4, 2020
Priority date	Jun 6, 2019
Publication date	Mar 5, 2024
Grant date	Mar 5, 2024

Abstract

A luminophore having the general empirical formula X′ 1−x A′ y (Al 1+z A′ 3−z )O 4 :E′ that crystallizes in a tetragonal crystal system.
X′ may be Mg, Ca, Sr, Ba, and combinations thereof; A′ may be Li, Na, K, Rb, Cs, and combinations thereof; E′ may be Eu, Ce, Yb, Mn, and combinations thereof; 0<x<0.25; y≤x; and z=0.5(2x−y).

First claim

The invention claimed is:

1. A luminophore having the general empirical formula X′ 1−x A′ y (Al 1+z A′ 3−z )O 4 :E′ that crystallizes in a tetragonal crystal system;
wherein:
X′ is selected from the group consisting of Mg, Ca, Sr, Ba, and combinations thereof;
A′ is selected from the group consisting of Li, Na, K, Rb, Cs, and combinations thereof;
E′ is selected from the group consisting of Eu, Ce, Yb, Mn, and combinations thereof;
0<x<0.25;
y<x; and
z=0.5(2x−y).

2. The luminophore as claimed in claim 1 , wherein the luminophore has the general empirical formula X′ 1−x Li y (Al 1+z Li 3−z )O 4 :E′.

3. The luminophore as claimed in claim 1 , wherein the luminophore has the general empirical formula Sr 1−x Li y (Al 1+z Li 3−z )O 4 :E′.

4. The luminophore as claimed in claim 1 , wherein x=y.

5. The luminophore as claimed in claim 1 , wherein 0.10<x<0.18.

6. The luminophore as claimed in claim 1 , wherein the luminophore crystallizes in the tetragonal space group I4/m.

7. A luminophore mixture comprising:
a luminophore having the general empirical formula XA 3 AlO 4 :E that crystallizes in a triclinic crystal system,
wherein:
X is selected from the group consisting of Mg, Ca, Sr, Ba, and combinations thereof;
A is selected from the group consisting of Li, Na, K, Rb, Cs, and combinations thereof; and
E is selected from the group consisting of Eu, Ce, Yb, Mn, and combinations thereof; and

a luminophore having the general empirical formula X′ 1−x A′ y (Al 1+z A′ 3−z )O 4 :E′ that crystallizes in a tetragonal crystal system,
wherein:
X′ is selected from the group consisting of Mg, Ca, Sr, Ba, and combinations thereof;
A′ is selected from the group consisting of Li, Na, K, Rb, Cs, and combinations thereof;
E′ is selected from the group consisting of Eu, Ce, Yb, Mn, and combinations thereof;
0<x<0.2;
y≤x; and
z=0.5(2x−y).

8. A light source comprising a luminophore as claimed in claim 1 .

9. The light source as claimed in claim 8 , further comprising:
at least one primary radiation source configured to emit electromagnetic primary radiation; and
a conversion element comprising the luminophore; and wherein the conversion element is configured to at least partially convert the electromagnetic primary radiation to electromagnetic secondary radiation.

10. The light source as claimed in claim 9 , wherein the light source is configured to emit a white overall radiation or to emit a yellow overall radiation.

11. The light source as claimed in claim 8 , wherein the at least one primary radiation source is a light-emitting diode or a laser diode.

12. The light source as claimed in claim 11 , wherein the primary radiation source is a laser diode.

13. The light source as claimed in claim 12 , wherein the conversion element is a rotatable luminophore wheel.

14. A floodlight comprising a light source as claimed in claim 12 .

15. The floodlight as claimed in claim 14 , wherein the floodlight is a motor vehicle headlight.

16. The floodlight as claimed in claim 14 ; wherein the floodlight is arranged in general lighting, exterior lighting, security lighting, stage lighting, or specialty lighting.

17. The light source as claimed in claim 8 ; wherein the light source is arranged in a display or projector.

18. A light source comprising a luminophore as claimed in claim 7 .

Assignees

• Osram Opto Semiconductors Gmbh

Inventors

• Bichler Daniel
• Dallmeir Simon
• Koch Christian
• Peschke Simon
• Plundrich Gudrun
• Schmid Philipp
• Stoll Christiane
• Strube-Knyrim Johanna
• Thoma Jutta
• Vorsthove Mark

Classifications

• C09K11/7734 Primary

  Aluminates · CPC title

• C09K11/7706

  Aluminates · CPC title

• F21S41/16

  Laser light sources · CPC title

• F21S41/176

  Light sources where the light is generated by photoluminescent material spaced from a primary light generating element · CPC title

• F21V9/30

  Elements containing photoluminescent material distinct from or spaced from the light source (shades F21V1/17; globes, bowls or cover glasses F21V3/08, F21V3/12; refractors F21V5/10; reflectors F21V7/26, F21V7/30; elements with provision for controlling the spectral properties or intensity F21V9/40) · CPC title