Phosphor

Patent metadata

Field	Value
Publication number	US-10752836-B2
Application number	US-201615572449-A
Country	US
Kind code	B2
Filing date	May 6, 2016
Priority date	May 7, 2015
Publication date	Aug 25, 2020
Grant date	Aug 25, 2020

Abstract

A phosphor is disclosed. In an embodiment the phosphor includes an inorganic compound having at least one activator E and N and/or O in its empirical formula, wherein E is selected from the group consisting of Mn, Cr, Ni, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Yb, Tm, Li, Na, K, Rb, Cs and combinations thereof, and wherein the inorganic compound crystallizes in a crystal structure with the same atomic sequence as in K 2 Zn 6 O 7 .

First claim

The invention claimed is:

1. A phosphor comprising:
an inorganic compound having one of the following empirical formulae:
M 4 Li 1+y′/2 Al 11−y′/2 N 14−y′ O y′ :E, M 4 Li 1−z′ Al 11−z′ Zn 2z′ N 14 :E, M 4 LiAl 11−x′ Zn x′ N 14−x′ O x′ :E, or
M 4 LiAl 11−y″ Mg y″ N 14−y″ O y″ :E, M 4 Li 1+z″ Al 11−3z″ Si 2z″ N 14 :E or M 4 LiAl 11−2x″ Si x″ Mg x″ N 14 :E,

wherein M=Ca, Sr and/or Ba,
wherein 0≤y′≤14, 0≤z′≤1, 0≤x′≤11, 0≤y″≤11, 0≤z″≤3 and 0≤x″≤5,
wherein E is selected from the group consisting of Mn, Cr, Ni, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Yb, Tm, Li, Na, K, Rb, Cs and combinations thereof, and
wherein the inorganic compound crystallizes in a crystal structure with the same atomic sequence as in K 2 Zn 6 O 7 .

2. The phosphor according to claim 1 , wherein M=Sr.

3. The phosphor according to claim 1 , wherein the inorganic compound has one of the following empirical formulae:
M 4−x Eu x Li 1+y′/2 Al 11−y′/2 N 14−y′ O y′ , M 4−x Eu x Li 1−z′ Al 11−z′ Zn 2z′ N 14 ,M 4−x Eu x LiAl 11−x′ Zn x′ N 14−x′ O x′ ,M 4−x Eu x LiAl 11−y″ Mg y″ N 14−y″ O y″ ,M 4−x Eu x Li 1+z″ Al 11−3z″ Si 2z″ N 14 or M 4−x Eu x LiAl 11−2x″ Si x″ Mg x″ N 14 ,
wherein M=Ca, Sr and/or Ba, and
0≤y′≤14,
0≤z′≤1,
0≤x′≤11,
0≤y″≤11,
0≤z″≤3,
0≤x″≤5 and
0<x≤2.

4. The phosphor according to claim 1 , wherein the inorganic compound has the following empirical formula:
M 4−x Eu x LiAl 11 N 14 ,
wherein M=Ca, Sr and/or Ba, and 0<x≤2.

5. The phosphor according to claim 1 , wherein the phosphor has an emission maximum in a range from 500 to 680 nm.

6. The phosphor according to claim 1 , wherein the phosphor has a dominant wavelength of λ>500 nm.

7. A method for producing phosphor, wherein the phosphor comprises an inorganic compound, wherein the inorganic compound has one of the following empirical formulae:
M 4 Li 1+y′/2 Al 11−y′/2 N 14−y′ O y′ :E, M 4 Li 1−z′ Al 11−z′ Zn 2z′ N 14 :E, M 4 LiAl 11−x′ Zn x′ N 14−x′ O x′ :E, or
M 4 LiAl 11−y″ Mg y″ N 14−y″ O y″ :E, M 4 Li 1+z″ Al 11−3z″ Si 2z″ N 14 :E or M 4 LiAl 11−2x″ Si x″ Mg x″ N 14 :E,
wherein 0≤y′≤14, o≤z′≤1, 0≤x′≤11, 0≤y″≤11, 0≤z″≤3 and 0≤x″≤5,
wherein M=Sr, and
wherein E is selected from the group consisting of Mn, Cr, Ni, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Yb, Tm, Li, Na, K, Rb, Cs and combinations thereof, the method comprising:
mixing starting materials comprising Li 3 N, LiAlH 4 , Sr 3 N 2 , AlN and EuF 3 or Li 3 N, LiAlH 4 , Sr 3 N 2 , AlN, SrH 2 and EuF 3 ;
heating the mixture to a temperature of between 900 and 1400° C.;
annealing the mixture at a temperature of 900 to 1400° C. for five minutes to six hours; and
cooling the mixture to room temperature.

8. The method according to claim 7 , wherein method comprises performing the method between heating the mixture and cooling the mixture under a forming gas atmosphere.

9. A conversion element comprising the phosphor according to claim 1 .

10. The conversion element according to claim 9 , wherein the conversion element is a conversion element for an LED.

11. A method for using the phosphor according to claim 1 , the method comprising:
converting incoming light, by the phosphor, into a longer-wave light.

12. A red-emitting phosphor according to claim 1 , the red-emitting phosphor comprising:
an Eu 2+ -doped nitridoaluminate phosphor,
wherein, in a X-ray powder diffractogram using Cu—K α1 radiation, the red-emitting phosphor has two characteristic reflections in an angular range of 11.5-12.5° 2θ and in an angular range of 18.5-19.5° 2θ.

13. The red-emitting phosphor according to claim 12 , wherein a crystal structure of the Eu 2+ -doped nitridoaluminate phosphor has the same atomic sequence as in K 2 Zn 6 O 7 .

Assignees

• Osram Oled Gmbh

Inventors

• Seibald Markus
• Fiedler Tim
• Baumann Dominik
• Huppertz Hubert
• Wurst Klaus
• Heymann Gunter
• Wilhelm Dominik

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

• C04B2235/3865

  Aluminium nitrides · CPC title

• C01B21/0602

  with two or more other elements chosen from metals, silicon or boron · CPC title