Red emitting luminescent material

Patent metadata

Field	Value
Publication number	US-10968388-B2
Application number	US-201615772498-A
Country	US
Kind code	B2
Filing date	Nov 3, 2016
Priority date	Nov 6, 2015
Publication date	Apr 6, 2021
Grant date	Apr 6, 2021

Abstract

A red-emitting phosphor comprising an Eu2+ doped nitridoaluminate phosphor is provided. The red emitting phosphor comprises an emission maximum in the range of 610 to 640 nm of the electromagnetic spectrum.

First claim

The invention claimed is:

1. A red-emitting phosphor comprising an Eu 2+ doped nitridoaluminate phosphor, wherein the red-emitting phosphor comprises an emission maximum in the range of 620 to 635 nm of the electromagnetic spectrum.

2. Red-emitting phosphor according to claim 1 , wherein
the red-emitting phosphor has a half-width of less than 65 nm, and
the red-emitting phosphor comprises the elements Ca, Li, Al, N and Eu.

3. Red-emitting phosphor according to claim 1 , wherein the red-emitting phosphor comprises a half-width of less than 65 nm.

4. Red-emitting phosphor according to claim 1 , wherein the red-emitting phosphor comprises the elements Ca, Li, Al, N and Eu.

5. Red-emitting phosphor according to claim 1 , wherein the red-emitting phosphor consists of the elements Ca, Li, Al, N and Eu.

6. Red-emitting phosphor according to claim 1 , wherein the red-emitting phosphor is prepared from starting materials comprising Li 3 N, LiAlH 4 , AlN, Ca 3 N 2 and EuF 3 .

7. Red-emitting phosphor according to claim 6 , wherein the molar ratio of the starting materials corresponds to the molar composition Ca 1-x LiAl 3 N 4 Eu x , where x=0.001 to 0.1.

8. Red-emitting phosphor according to claim 1 , wherein the red-emitting phosphor comprises a dominant wavelength of λ, <620 nm.

9. A method of preparing a red-emitting phosphor comprising an Eu 2+ doped nitridoaluminate phosphor, wherein the red-emitting phosphor comprises an emission maximum in the range of 610 to 640 nm of the electromagnetic spectrum, comprising the steps of:
A) mixing the starting materials comprising Li 3 N, LiAlH 4 , Ca 3 N 2 , AIN and EuF 3 ,
B) heating the mixture obtained under A) to a temperature between 900 and 1400° C.,
C) applying a thermal treatment to the mixture at a temperature of 900 to 1400° C. for five minutes to 30 hours, and
D) cooling of the mixture to room temperature.

10. Method according to claim 9 , wherein steps B) to D) take place under a forming gas atmosphere.

11. Method according to claim 9 , wherein the starting materials are used in a molar ratio of AlN:Ca 3 N 2 :Li 3 N:LiAlH 4 :EuF 3 =1:0.05-0.5:0.01-0.1:0.05-0.5:0.0001-0.01.

12. LED having a conversion element comprising a phosphor according to claim 1 .

13. Red-emitting phosphor according to claim 1 , wherein
the red-emitting phosphor has a half-width of less than 65 nm, and
the red-emitting phosphor consists of the elements Ca, Li, Al, N and Eu.

14. A red-emitting phosphor comprising an Eu 2+ doped nitridoaluminate phosphor, wherein the red-emitting phosphor comprises an emission maximum in the range of 610 to 640 nm of the electromagnetic spectrum and wherein the red-emitting phosphor comprises the elements Ca, Li, Al, N and Eu.

Assignees

• Osram Opto Semiconductors Gmbh

Inventors

• Seibald Markus
• Fiedler Tim

Classifications

• C09K11/0883 Primary

  Arsenides; Nitrides; Phosphides · CPC title

• C09K11/77346 Primary

  Aluminium Nitrides or Aluminium Oxynitrides · CPC title

• H10H20/8512

  Wavelength conversion materials · CPC title

• H01L33/502

  Electricity · mapped topic

• C09K11/7734 Primary

  Aluminates · CPC title