Red-emitting phosphors, processes and devices

Patent metadata

Field	Value
Publication number	US-10815423-B2
Application number	US-201615555719-A
Country	US
Kind code	B2
Filing date	Mar 2, 2016
Priority date	Mar 5, 2015
Publication date	Oct 27, 2020
Grant date	Oct 27, 2020

Abstract

A process for synthesizing a Mn4+ doped phosphor of formula I by electrolysis is presented. The process includes electrolyzing a reaction solution comprising a source of manganese, a source of M and a source of A. One aspect relates to a phosphor composition produced by the process. A lighting apparatus including the phosphor composition is also provided. Ax[MFy]:Mn4+ (I) where, A is Li, Na, K, Rb, Cs, or a combination thereof; M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Hf, Y, La, Nb, Ta, Bi, Gd, or a combination thereof; x is the absolute value of the charge of the [MFy] ion; and y is 5, 6 or 7.

First claim

What is claimed is:

1. A process for synthesizing a Mn 4+ doped phosphor of formula I:
A X [MF y ]:Mn 4+   (I)

wherein, A is Li, Na, K, Rb, Cs, or a combination thereof;
M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Hf, Y, La, Nb, Ta, Bi, Gd, or a combination thereof;
x is the absolute value of the charge of the [MF y ] ion; and
y is 5, 6 or 7;
the method comprising electrolyzing a reaction solution comprising a source of manganese dissolved in at least one of hydrofluoric acid and hexafluorosilicic acid, a source of M and a source of A, wherein electrolyzing further comprises:
passing an electric current through the reaction solution comprising the source of manganese and at least one of hydrofluoric acid and hexafluorosilicic acid to form an electrolyzed manganese solution,
combining the source of M and the source of A with the electrolyzed manganese solution to form a combined solution; and
passing an electric current through the combined solution.

2. The process according to claim 1 , wherein the source of manganese is a compound comprising Mn 2+ , Mn 3+ , Mn 4+ , Mn 5+ , Mn 6+ or a combination thereof.

3. The process according to claim 1 , wherein the source of manganese is MnF 2 , MnF 3 , MnCl 3 , MnCl 2 , MnO 2 or a combination thereof.

4. The process according to claim 1 , wherein M is Si, Ge, Ti, or a combination thereof.

5. The process according to claim 1 , wherein the source of M is H 2 SiF 6 , A 2 SiF 6 , SiO 2 , SiCl 4 , Si(OAc) 4 or a combination thereof.

6. The process according to claim 1 , wherein the source of A is AF, ACl, AOCH 3 , A 2 C 2 O 4 , AH 2 PO 4 , or a combination thereof.

7. The process according to claim 1 , wherein the source of A is KF, KHF 2 , or a combination thereof.

8. The process according to claim 1 , wherein the Mn 4+ doped phosphor of formula I is A 2 [MF 6 ]:Mn 4+ , wherein A is Li, Na, K, Rb, Cs, or a combination thereof; and M is Si, Ge, Ti, or a combination thereof.

9. The process according to claim 1 , wherein the Mn 4+ doped phosphor of formula I is K 2 SiF 6 :Mn 4+ .

Assignees

• Current Lighting Solutions Llc

Inventors

• Porob Digamber Gurudas
• Setler Anant Achyut
• Nammalwar Prasanth Kumar
• Murphy James Edward

Classifications

• C01G45/22

  Compounds containing manganese, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• C09K11/613 Primary

  with alkali or alkakine earth metals · CPC title

• C09K11/617

  Silicates · CPC title

• C25B1/00

  Electrolytic production of inorganic compounds or non-metals · CPC title

• C25B9/70

  Assemblies comprising two or more cells · CPC title