Phosphors

Patent metadata

Field	Value
Publication number	US-2016244665-A1
Application number	US-201415031050-A
Country	US
Kind code	A1
Filing date	Sep 23, 2014
Priority date	Oct 21, 2013
Publication date	Aug 25, 2016
Grant date	—

Abstract

The present invention relates to cerium-doped garnet phosphors. The present invention furthermore relates to a process for the preparation of cerium-doped garnet phosphors, and to the use of these garnet phosphors as conversion phosphors. The present invention furthermore relates to a light-emitting device which contains cerium-doped garnet phosphors according to the invention.

First claim

1 . Compound of the formula (1),
(Lu 1-v M′ v ) 3-x-z (EA) z (Al 1-y Ga y ) 5-z (Si 1-w Ge w ) z O 12 :Ce 3+ x   formula (1)
where the following applies to the symbols and indices used: M′ is Y, Tb, Gd or a mixture of these metals; EA is Ca, Sr, Ba or a mixture of these metals; 0<x<0.50; 0≦y≦0.40; 0.01≦z≦0.5; 0≦w≦1; 0≦v<1.

2 . Compound according to claim 1 of the formula (1a), (1b) or (1c),
Lu 3-x-z (EA) z (Al 1-y Ga y ) 5-z (Si 1-w Ge w ) z O 12 :Ce 3+ x   formula (1a)

(Lu 1-v M′ v ) 3-x-z (EA) z Al 5-z (Si 1-w Ge w ) z O 12 :Ce 3+ x   formula (1b)

(Lu 1-v M′ v ) 3-x-z (EA) z (Al 1-y Ga y ) 5-z Si z O 12 :Ce 3+ x   formula (1c)

where the symbols and indices used have the meanings given in claim 1 .

3 . Compound according to claim 1 of the formula (2a) or (2b),
(Lu 1-v M′ v ) 3-x-z (EA) z Al 5-z Si z O 12 :Ce 3+ x   formula (2a)

Lu 3-x-z (EA) z Al 5-z Si z O 12 :Ce 3+ x   formula (2b)

where the symbols and indices used have the meanings given in claim 1 .

4 . Compound according to claim 1 , characterised in that EA is selected from Sr and/or Ba.

5 . Compound according to claim 1 , characterised in that the following applies to x: 0.01≦x≦0.15.

6 . Compound according to claim 1 , characterised in that the following applies to z: 0.01≦z≦0.25.

7 . Process for the preparation of a cerium-doped garnet, characterised in that the process is carried out via a precursor prepared by wet-chemical methods, and a silicon- or germanium-containing compound and an alkaline-earth metal halide are added.

8 . Process according to claim 7 , characterised in that the cerium-doped garnet is a compound of the formula (3) or (4),
M 3-x (Al 1-y Ga y ) 5 O 12 :Ce 3+ x   formula (3)
M 3-x-z (EA) z (Al 1-y Ga y ) 5-z (Si 1-w Ge w ) z O 12 :Ce 3+ x   formula (4)
where the following applies to the symbols and indices used: M is Lu, Y, Tb, Gd or a mixture of these metals; EA is Mg, Ca, Sr, Ba or a mixture of these metals; 0<x<0.50; 0≦y≦0.40; 0.01≦z≦0.5; 0≦w<1; some of the ions M in formula (3) may also be replaced by an alkaline-earth metal selected from Mg, Ca, Sr and/or Ba, and at the same time an equal proportion of Al or Ga may be replaced by Si or Ge.

9 . Process according to claim 7 , characterised in that the silicon-containing or germanium-containing compound is a silicon dioxide or germanium dioxide suspension or a precursor thereof selected from tetraalkyl orthosilicates, where the alkyl groups have, identically or differently on each occurrence, 1 to 10 C atoms, or silicon halides or tetraalkyl orthogermanates, where the alkyl groups have, identically or differently on each occurrence, 1 to 10 C atoms, or germanium halides.

10 . Process according to claim 7 , characterised in that the alkaline-earth metal halide employed is CaCl 2 , SrCl 2 and/or BaCl 2 .

11 . Compound obtainable by a process according to claim 7 .

12 . Emission-converting material comprising a compound according to claim 1 and optionally one or more further conversion phosphors.

13 . A method which comprises converting light into light having a longer wavelength with a phosphor or conversion phosphor comprising a compound according to claim 1 .

14 . Light source comprising a primary light source and at least one compound according to claim 1 .

15 . Light source according to claim 14 , characterised in that the primary light source is a luminescent indium aluminium gallium nitride, in particular of the formula In i Ga j Al k N, where 0≦i, 0≦j, 0≦k, and i+j+k=1, or a luminescent arrangement based on ZnO, TCO (transparent conducting oxide) or SiC, or a plasma or discharge source.

16 . A method which comprises converting light into light having a longer wavelength with a phosphor or conversion phosphor comprising an emission-converting material according to claim 12 .

17 . Light source comprising a primary light source and at least one emission-converting material according to claim 12 .

Assignees

• Merck Patent Gmbh

Inventors

• Vosgroene Tim
• Winkler Holger
• Petry Ralf
• Hampel Christof
• Benker Andreas

Classifications

• H05B33/14 Primary

  characterised by the chemical or physical composition or the arrangement of the electroluminescent material {, or by the simultaneous addition of the electroluminescent material in or onto the light source} · CPC title

• C09K11/77744 Primary

  Aluminosilicates · CPC title

• C09K11/7774 Primary

  Aluminates · CPC title

• H10H20/8512

  Wavelength conversion materials · CPC title

• H10H20/825

  containing nitrogen, e.g. GaN · CPC title