LED phosphor comprising bow-tie shaped A2N6 building blocks

Patent metadata

Field	Value
Publication number	US-10539275-B2
Application number	US-201515526519-A
Country	US
Kind code	B2
Filing date	Nov 5, 2015
Priority date	Nov 14, 2014
Publication date	Jan 21, 2020
Grant date	Jan 21, 2020

Abstract

The invention provides, amongst others for application in a lighting unit, a phosphor selected from the class of

M 2 D 2 C 2-2b B b A 2 N 6 :Ln  (I)

with

M=selected from the group consisting of divalent Ca, Sr, and Ba;

D=selected from the group consisting of monovalent Li, divalent Mg, Mn, Zn, Cd, and trivalent Al and Ga;

C=selected from the group consisting of monovalent Li and Cu;

B=selected from the group consisting of divalent Mg, Zn, Mn and Cd;

A=selected from the group consisting of tetravalent Si, Ge, Ti, and Hf;

Ln=selected from the group consisting of ES and RE;

ES=selected from the group consisting of divalent Eu, Sm and Yb;

RE=selected from the group consisting of trivalent Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, and Tm; and

0≤b≤1.

First claim

The invention claimed is:

1. A lighting unit comprising a light source, configured to generate light source light and a luminescent material configured to convert at least part of the light source light into luminescent material light, wherein the light source comprises a light emitting diode (LED), and wherein the luminescent material comprises a phosphor selected from the class of
M 2 D 2 C 2-2b B b A 2 N 6 :Ln  (I)

wherein
M=one or more selected from the group consisting of divalent Ca, Sr, and Ba;
D=one or more selected from the group consisting of monovalent Li, divalent Mg, Mn, Zn, Cd, and trivalent Al and Ga;
C=one or more selected from the group consisting of monovalent Li and Cu;
B=one or more selected from the group consisting of divalent Mg, Zn, Mn and Cd;
A=one or more selected from the group consisting of tetravalent Si, Ge, Ti, and Hf;
Ln=one or more selected from the group consisting of ES and RE;
ES=one or more selected from the group consisting of divalent Eu, Sm and Yb;
RE=one or more selected from the group consisting of trivalent Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, and Tm; and
wherein 0≤b≤1.

2. The lighting unit of claim 1 , wherein M comprises one or more of Ca and Sr, wherein D comprises Mg, wherein C comprises Li and b=0, wherein A comprises Si, and wherein Ln comprises one or more of divalent Eu and trivalent Ce.

3. The lighting unit of claim 1 , wherein the phosphor comprises (M 1-x ) 2 D 2 C 2-2b B b A 2 N 6 :Eu x , wherein 0<x≤0.2.

4. The lighting unit of claim 1 , wherein the phosphor comprises (M 1-y ) 2 D 2 C 2-2b B b A 2 N 6 :Ce y , wherein 0<y≤0.2.

5. The lighting unit of claim 1 , wherein the phosphor comprises M 2 Mg 2 Li 2 Si 2 N 6 :Ln, wherein M comprises one or more of Ca and Sr.

6. The lighting unit of claim 1 , wherein the luminescent material further comprises one or more other phosphors selected from the group consisting of a divalent europium containing nitride luminescent material, a divalent europium containing oxonitride luminescent material, a trivalent cerium containing garnet and a trivalent cerium containing oxonitride, and wherein the light source is configured to generate blue light.

7. A phosphor selected from the class of
M 2 D 2 C 2-2b B b A 2 N 6 :Ln  (I)

with
M=one or more selected from the group consisting of divalent Ca, Sr, and Ba
D=one or more selected from the group consisting of monovalent Li, divalent Mg, Mn, Zn, Cd, and trivalent Al and Ga;
C=one or more selected from the group consisting of monovalent Li and Cu;
B=one or more selected from the group consisting of divalent Mg, Zn, Mn and Cd;
A=one or more selected from the group consisting of tetravalent Si, Ge, Ti, and Hf;
Ln=one or more selected from the group consisting of ES and RE;
ES=one or more selected from the group consisting of divalent Eu, Sm and Yb;
RE =one or more selected from the group consisting of trivalent Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, and Tm; and
wherein 0≤b ≤1.

8. The phosphor of claim 7 , wherein the phosphor comprises M 2 D 2 C 2-2b B b A 2 N 6 :Ln (I), wherein M comprises one or more of Ca and Sr, wherein D comprises Mg, wherein C comprises Li and b=0, wherein A comprises Si, and wherein Ln comprises one or more of divalent Eu and trivalent Ce.

9. The phosphor of claim 7 , wherein the phosphor comprises (M 1-x ) 2 D 2 C 2-2b B b A 2 N 6 :Eu x , wherein 0 <x ≤0.2.

10. The phosphor of claim 7 , wherein the phosphor comprises (M 1-y ) 2 D 2 C 2-2b B b A 2 N 6 :Ce y , wherein 0 <y ≤0.2.

11. The phosphor of claim 7 , wherein the phosphor comprises M 2 Mg 2 Li 2 Si 2 N 6 :Ln, wherein M comprises one or more of Ca and Sr.

12. The phosphor of claim 7 , wherein the phosphor comprises phosphor particles having a coating, wherein the coating comprises one or more coating selected from the group consisting of an AlPO 4 coating, an Al 2 O 3 coating and a SiO 2 coating.

13. A method for making a phosphor, the method comprising steps of:
combining a selection of starting materials to form the phosphor in the class of,
M 2 D 2 C 2-2b B b A 2 N 6 :Ln  (I)

wherein
M=one or more selected from the group consisting of divalent Ca, Sr, and Ba
D=one or more selected from the group consisting of monovalent Li, divalent Mg, Mn, Zn, Cd, and trivalent Al and Ga;
C=one or more selected from the group consisting of monovalent Li and Cu;
B=one or more selected from the group consisting of divalent Mg, Zn, Mn and Cd;
A=one or more selected from the group consisting of tetravalent Si, Ge, Ti, and Hf;
Ln=one or more selected from the group consisting of ES and RE;
ES=one or more selected from the group consisting of divalent Eu, Sm and Yb;
RE=one or more selected from the group consisting of trivalent Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, and Tm; and
wherein 0 ≤b ≤1; and

heating the starting materials at a temperature in a range of about 800° C. to about 1300° C.

14. The method of claim 13 , wherein Ln comprises one or more of Eu and Ce, and wherein the heating is performed in a reducing atmosphere.

15. A backlighting unit of an LCD display device comprising the lighting unit of claim 1 .

16. A projection system comprising the lighting unit of claim 1 .

17. A self-lit display system comprising the lighting unit of claim 1 .

18. A pixelated display system comprising the lighting unit of claim 1 .

19. A segmented display system comprising the lighting unit of claim 1 .

20. A medical lighting system comprising the lighting unit of claim 1 .

Assignees

• Koninklijke Philips Nv

Inventors

• Schmidt Peter Josef
• Strobel Philipp-Jean
• Schmiechen Sebastian Florian
• Hecht Cora Sieglinde
• Weiler Volker
• Schnick Wolfgang

Classifications

• F21V13/08

  the elements being filters or photoluminescent elements and reflectors · CPC title

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• C09K11/0883

  Arsenides; Nitrides; Phosphides · CPC title

• C01F17/30

  Compounds containing rare earth metals and at least one element other than a rare earth metal, oxygen or hydrogen, e.g. La4S3Br6 (C01F17/247 - C01F17/294 take precedence) · CPC title

• C01P2002/85

  by XPS, EDX or EDAX data · CPC title