Red-emitting phosphors, associated processes and devices

Patent metadata

Field	Value
Publication number	US-9512357-B2
Application number	US-201414337984-A
Country	US
Kind code	B2
Filing date	Jul 22, 2014
Priority date	Jul 22, 2014
Publication date	Dec 6, 2016
Grant date	Dec 6, 2016

Abstract

A process for synthesizing a Mn 4+ doped phosphor is presented. The process includes contacting a source of Mn 4+ ions to a suspension comprising aqueous hydrofluoric acid and a complex fluoride compound of formula (II) in solid form, and then contacting a source of A + ions to the suspension to form the Mn 4+ doped phosphor,

A x [MF y ]   (II)
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; y is 5, 6 or 7.

First claim

The invention claimed is:

1. A population of particles having a core which is substantially free of Mn 4+ ions, a first shell and a second shell, wherein the core comprises a compound of formula (II)
A x [MF y ]   (II);

the first shell comprises a composition of formula (IV)
A x [(M 1−z ,Mn z )F y ]   (IV)

and the second shell comprises a composition of formula (V)
A x [(M 1−w ,Mn w )F y ]   (V)

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 1, 2 or 3 and is equal to the absolute value of the charge of the [MF y ] ion;
y is 5, 6 or 7; and
0<z≦0.2; and
0≦w≦z.

2. The population of particles according to claim 1 , comprising a particle size distribution having a particle size span ≦1.

3. The population of particles according to claim 1 , comprising a particle size distribution having a particle size span ≦0.9.

4. The population of particles according to claim 1 , wherein the core is K 2 SiF 6 and first shell is K 2 (Si 1−z , Mn z )F 6 .

5. The population of particles according to claim 1 , wherein the second shell is K 2 (Si 1−w , Mn w )F 6 .

6. A lighting apparatus comprising a semiconductor light source and the population of particles according to claim 1 radiationally coupled to the light source.

7. A backlight device comprising a semiconductor light source and the population of particles according to claim 1 radiationally coupled to the light source.

Assignees

• Gen Electric

Inventors

• Murphy James Edward

Classifications

• H10W90/756

  between a chip and a stacked lead frame, conducting package substrate or heat sink · CPC title

• H10W74/00

  Encapsulations, e.g. protective coatings · CPC title

• H10H20/8512

  Wavelength conversion materials · CPC title

• C09K11/616 Primary

  with alkali or alkaline earth metals · CPC title

• F21K9/64

  using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer · CPC title