Phosphor, method for producing a phosphor and use of a phosphor

Patent metadata

Field	Value
Publication number	US-10793774-B2
Application number	US-201615738058-A
Country	US
Kind code	B2
Filing date	Jun 22, 2016
Priority date	Jun 25, 2015
Publication date	Oct 6, 2020
Grant date	Oct 6, 2020

Abstract

The invention relates to a red-emitting luminescent material of the formula AE16−xCexSi17−zAlzN32+y−zO2−y+z wherein AE=Mg, Ca, Sr and/or Ba, 0<x≤2, 0≤y<5, 0≤z≤3 and y+z<2.

First claim

The invention claimed is:

1. Phosphor of the formula AE 16−x Ce x Si 17-z Al z N 32+y−z O 2−y+z with AE=Mg, Ca, Sr and/or Ba, 0<x≤2, 0≤y<5, 0≤z≤3 and y+z<8, wherein the phosphor has a cubic crystal system with the space group F 4 3m.

2. Phosphor according to claim 1 , wherein the lattice constant a is at a=14.7−15.1 Å.

3. Phosphor according to claim 1 , wherein 0.0016<x≤1.6.

4. Phosphor according to claim 1 , wherein z=0 and y=x.

5. Phosphor according to claim 1 , which is configured to emit radiation in the red spectral range of the electromagnetic spectrum.

6. Phosphor according to claim 1 , which has an emission maximum in the range from 630 nm to 680 nm.

7. Method for producing a phosphor of the formula AE 16−x Ce x Si 17-z A1 z N 32+y−z O 2−y+z , with AE=Mg, Ca, Sr and/or Ba, 0<x≤2, 0≤y<5, 0≤z≤3 and y+z<8, wherein the phosphor is configured to emit radiation in the red spectral range of the electromagnetic spectrum, comprising the method steps
A) Mixing of the starting materials comprising an Mg, Ba, Sr and/or Ca nitride, Si 3 N 4 , CeO 2 , SiO 2 and/or an Mg, Ba, Sr, Al and/or Ca oxide, wherein the proportion of oxygen in the starting materials is 2 mol % to 20 mol % in relation to the total quantity of nitrogen and oxygen in the starting materials,
B) Heating of the mixture obtained in A) to a temperature over 1200° C.,
C) Annealing of the mixture at a temperature over 1200° C. for at least 4 hours,
D) Cooling of the mixture to room temperature.

8. Method according to claim 7 , wherein the method steps A) to D) are executed in a nitrogen atmosphere.

9. Method according to claim 7 , wherein the starting materials in method step A) comprise AlN.

Assignees

• Osram Oled Gmbh

Inventors

• Bichler Daniel
• Koch Christian
• Strube-Knyrim Johanna

Classifications

• C09K11/77217 Primary

  Silicon Nitrides or Silicon Oxynitrides · 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

• C01P2002/84

  by UV- or VIS- data · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title

• C09K11/7721 Primary

  Aluminates · CPC title