# US 2021/0340443 A1 · Color stable red-emitting phosphors

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2021/0340443 A1
- Document ID: US20210340443A1
- Status: Published application
- Kind: A1
- Application number: 17/374,441
- Filed: 2021-07-13
- Published: 2021-11-04
- Earliest claimed: 2013-03-15
- Assignees: Current Lighting Solutions, LLC
- Applicants: Current Lighting Solutions, LLC
- Inventors: James Edward MURPHY; Anant Achyut SETLUR; Florencio GARCIA; Robert Joseph LYONS; Ashfaqul Islam CHOWDHURY; Nagaveni KARKADA; Prasanth Kumar NAMMALWAR; William Winder BEERS
- Web page: https://patentgrep.com/patent/US20210340443A1

## CPC

- H10H 20/8512: {Wavelength conversion materials}
- C08K 3/34: Silicon-containing compounds
- C09K 11/025: {non-luminescent particle coatings or suspension media}
- C09K 11/616: {with alkali or alkaline earth metals}
- C09K 11/617: {Silicates}
- H10H 20/852: Encapsulations
- C09K 2211/181: of the alkali metals and alkaline earth metals
- C09K 2211/188: of other metals not provided for in one of the previous groups
- H10W 74/00: Encapsulations, e.g. protective coatings
- H10W 90/756: {between a chip and a stacked lead frame, conducting package substrate or heat sink}
- Y02B 20/00: Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

A lighting apparatus includes a semiconductor light source in direct contact with a polymer composite comprising a color stable Mn4+ doped phosphor, wherein the lighting apparatus has a color shift of ≤1.5 MacAdam ellipses after operating for at least 2,000 hour at a LED current density greater than 2 A/cm2, a LED wall-plug efficiency greater than 40%, and a board temperature greater than 25° C.

## Claims

### Claim at position 1

-9. (canceled)

### Claim 10

A lighting apparatus comprising a semiconductor light source; and
a color stable Mn4+ doped phosphor of formula K2SiF6:Mn4+, wherein % intensity loss of the phosphor after exposure to light flux of at least 80 w/cm2 at a temperature of at least 50° C. for at least 8 hours is ≤4%.

### Claim 11 (depends on 10)

The lighting apparatus according to claim 10, wherein % intensity loss of the phosphor is ≤3%.

### Claim 12 (depends on 10)

The lighting apparatus according to claim 10, wherein % intensity loss of the phosphor is ≤1%.

### Claim 13

A backlight device comprising a semiconductor light source; and
a color stable Mn4+ doped phosphor of formula K2SiF6:Mn4+, wherein % intensity loss of the phosphor after exposure to light flux of at least 80 w/cm2 at a temperature of at least 50° C. for at least 8 hours is ≤4%.

### Claim 14 (depends on 13)

The backlight device according to claim 13, wherein % intensity loss of the phosphor is ≤3%.

### Claim 15 (depends on 13)

The backlight device according to claim 13, wherein % intensity loss of the phosphor is ≤1%.

### Claim 16

A color stable Mn4+ doped phosphor of formula K2SiF6:Mn4+, wherein % intensity loss of the phosphor after exposure to light flux of at least 80 w/cm2 at a temperature of at least 50° C. for at least 8 hours is ≤4%.

### Claim 17 (depends on 16)

The color stable Mn4+ doped phosphor according to claim 16, wherein the % intensity loss of the phosphor is ≤3%.

### Claim 18 (depends on 16)

The color stable Mn4+ doped phosphor according to claim 16, wherein the % intensity loss of the phosphor is ≤1.5%.