Silicate phosphors

Patent metadata

Field	Value
Publication number	US-9657222-B2
Application number	US-201314396401-A
Country	US
Kind code	B2
Filing date	Mar 22, 2013
Priority date	Apr 24, 2012
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

The present invention relates to Eu—, Sm— or Pr-doped silicate compounds, to a process for the preparation thereof and to the use thereof as conversion phosphors. The present invention also relates to an emission-converting material comprising at least the conversion phosphor according to the invention and to the use thereof in light sources, in particular pc-LEDs (phosphor converted light emitting devices). The present invention furthermore relates to light sources, in particular pc-LEDs, and lighting units which contain a primary light source and the emission-converting material according to the invention.

First claim

The invention claimed is:

1. A compound of the formula I
(Ba y Sr 1−y )Zr 1−x Hf x Si 3 O 9   (I),

where x is in the range from 0 to 1 and, independently thereof, y is in the range from 0 to 1,
wherein some of the Zr or Hf ions have been replaced by Eu 3+ ions, Sm 3+ ions or Pr 3+ ions, and an amount of alkali-metal ions equivalent to the Eu 3+ ions, Sm 3+ ions or Pr 3+ ions is present for charge compensation.

2. A compound according to claim 1 , wherein 0.1 to 20 mol % of the Zr or Hf ions have been replaced by Eu, Pr or Sm ions.

3. A compound according to claim 2 , wherein 0.2 to 10 mol %, of the Zr or Hf ions have been replaced by Eu, Pr or Sm ions.

4. A compound according to claim 1 , wherein x is equal to 0 or 1.

5. A Compound according to claim 1 , wherein 0≦y<0.3.

6. A compound according to claim 5 , wherein y =0.

7. A compound according to claim 5 , wherein 0.7<y ≦1.

8. A compound according to claim 5 , wherein y=1.

9. A process for the preparation of a compound according to claim 1 , comprising:
a) providing a barium and/or strontium source, a zirconium or hafnium source, a silicon source and a source of one of on of the metals samarium, praseodymium or europium;
b) mixing of the sources provided in step a); and
c) temperature treatment of the sources mixed in step b) in the range from 1000 to 1700° C.

10. An emission-converting material comprising a compound according to claim 1 .

11. An emission-converting material according to claim 10 , which additionally comprises at least one further conversion phosphor.

12. An emission-converting material according to claim 11 , where the further conversion phosphor is a sulfide, a silicate, an aluminate, a borate, a nitride, an oxynitride, a siliconitride or a alumosiliconitride and said conversion phosphor is doped with Eu 2+ , Ce 3+ or Mn 2+ .

13. A light source comprising a primary light source and an emission-converting material according to claim 10 .

14. A light source according to claim 13 , wherein the primary light source is a luminescent indium aluminium gallium nitride.

15. A lighting unit, comprising at least one light source according to claim 13 .

16. A display device comprising at least one lighting unit according to claim 13 .

17. A liquid-crystal display device (LC display) comprising at least one lighting unit according to claim 15 .

18. A backlighting of display devices, comprising at least one light source according to claim 13 .

Assignees

• Merck Patent Gmbh

Inventors

• Winkler Holger
• Juestel Thomas
• Katelnikovas Arturas
• Baur Florian

Classifications

• C09K11/77062

  Silicates · CPC title

• C09K11/77342

  Silicates · CPC title

• H10H20/8512

  Wavelength conversion materials · CPC title

• C09K11/676 Primary

  Aluminates; Silicates · CPC title

• G02F2001/133614

  Physics · mapped topic