Violet light exciteable blue-emitting oxynitride phosphors and uses thereof

Patent metadata

Field	Value
Publication number	US-11788006-B2
Application number	US-202217821907-A
Country	US
Kind code	B2
Filing date	Aug 24, 2022
Priority date	Aug 24, 2021
Publication date	Oct 17, 2023
Grant date	Oct 17, 2023

Abstract

Provided herein are phosphors of the general molecular formula:A3-2xEuxMP3O9N,wherein the variables are as defined herein. Methods of producing the phosphors are also provided. In some aspects, the present disclosure provides light-emitting devices comprising these phosphors.

First claim

What is claimed is:

1. A phosphor of the general molecular formula:
A 3-2x Eu x MP 3 O 9 N,

wherein:
A is one or more alkali metal;
M is one or more elements selected from the group consisting of Al, Ga, In, Ti, V, Nb, Cr, Mn, Fe, Co, Sc, Y, La, Gd, and Lu; and
0<x≤0.25.

2. The phosphor of claim 1 , wherein A is potassium (I).

3. The phosphor of claim 1 , wherein M is aluminum (III).

4. The phosphor of claim 1 , wherein 0<x≤0.1, such as 0.03.

5. The phosphor of claim 1 , further defined as K 2.94 Eu 0.03 AlP 3 O 9 N.

6. The phosphor of claim 1 , wherein the phosphor at about 19° C. has an excitation spectrum peak at an excitation wavelength from about 260 nm to about 430 nm.

7. The phosphor of claim 1 , wherein the phosphor has an emission spectrum peak at an emission wavelength from about 375 nm to about 600 nm.

8. The phosphor of claim 7 , wherein the emission spectrum peak has a full width at half-maximum (FWHM) of from about 2600 cm −1 to about 2000 cm −1 .

9. The phosphor of claim 7 , wherein the emission spectrum peak has a full width at half-maximum (FWHM) of from about 55 nm to about 30 nm.

10. The phosphor of claim 1 , wherein the phosphor at about 21° C. has a photoluminescent quantum yield (PLQY) of greater than 5%.

11. A method for producing a phosphor of claim 1 , wherein the method comprises:
(a) mixing starting materials of the phosphor to produce a first reaction mixture, wherein the starting materials of the phosphor comprise one or more alkali metal sources, one or more metal sources, wherein each metal source is independently a transition metal source or a post-transition metal source, a phosphorous source, and a europium source; and
(b) heating the first reaction mixture to a first temperature for a first time period in the presence of a nitrogen source to produce the phosphor.

12. The method of claim 11 , wherein the alkali metal source is a potassium source, such as a potassium salt, such as KPO 3 .

13. The method of claim 11 , wherein the metal source is a post-transition metal source, such as an aluminum source, such as Al 2 O 3 .

14. The method of claim 11 , wherein the phosphorous source is a phosphate salt, such as KPO 3 .

15. The method of claim 11 , wherein the europium source is a europium oxide, such as Eu 2 O 3 .

16. The method of claim 11 , wherein the first temperature is from about 100° C. to about 200° C., such as about 150° C.

17. The method of claim 11 , wherein the nitrogen source is NH 3 , PON, HPN 2 , binary metal nitrides, (PNCl 2 ) 3 , or Na 2 NCN.

18. A phosphor prepared according to the method of claim 11 .

19. A light-emitting device comprising:
(a) an excitation light source that emits primary light; and
(b) a phosphor of claim 1 .

20. The light-emitting device of claim 19 , wherein the excitation light source is a semiconductor light source.

Assignees

• Univ Houston System

Inventors

• Brgoch Jakoah
• Hariyani Shruti

Classifications

• H10H20/8512

  Wavelength conversion materials · CPC title

• C09K11/7731 Primary

  with alkaline earth metals · CPC title

• C09K11/7728

  containing europium · CPC title

• C09K11/7787

  Oxides (C09K11/7785 takes precedence) · CPC title

• C09K11/7789

  Oxysulfides · CPC title