# US 6,987,353 B2 · Light emitting device having sulfoselenide fluorescent phosphor

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- Number: US 6,987,353 B2
- Document ID: US6987353B2
- Status: Granted
- Kind: B2
- Application number: 10/661,931
- Filed: 2003-09-15
- Published: 2005-02-03
- Granted: 2006-01-17
- Earliest claimed: 2003-08-02
- Assignees: Phosphortech Corporation
- Inventors: Hisham Menkara; Christopher Summers
- Web page: https://patentgrep.com/patent/US6987353B2

## CPC

- C09K 11/885: {with alkaline earth metals}
- C09K 11/886: {with rare earth metals}
- H10H 20/8512: {Wavelength conversion materials}
- Y02B 20/00: Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

Provided herein are novel phosphors useful in the manufacture of white light emitting diodes. The phosphors provided by the invention are described by the formula: described by the formula: ZnSxSey:Cu,A in which x and y are each independently any value between 0 and about 1, subject to the proviso that the sum of x and y is equal to any number in the range of between about 0.75 and about 1.25; wherein A is optional and comprises at least one additional element selected from the group consisting of: Ag, Al, Ce, Tb, Cl, I, Mg, and Mn, including mixtures thereof, and wherein Cu is present in any amount between about 0.0001% and about 5% in mole percent based on the total molar weight of said composition. Standard techniques used in phosphor deposition for the manufacture of light emitting diodes which comprise phosphors may be employed to produce LED's having a white light output when the phosphors of the invention are utilized.

## Claims

### Claim 1

A composition of matter useful as a phosphor in light emitting diodes, which comprises a material described by the formula:
ZnSxSey:Cu
wherein 0≦x≦0.5 and 0≦y≦0.5, and subject to the proviso that the sum of x and y is equal to any number in the range of between about 0.75 and about 1, and wherein Cu is present in any amount between about 0.0001% and about 5% in mole percent based on the total molar weight of said composition.

### Claim 2 (depends on 1)

A composition of matter which comprises a material described by the formula:
ZnSxSey:Cu
in which x and y are each independently any value between 0 and 1, subject to the proviso that the sum of x and y is equal to any number in the range of between about 0.75 and about 1.25, and subject to the proviso that x is equal to at least 0.2, and wherein Cu is present in any amount between about 0.0001% and about 5% in mole percent based on the total molar weight of said composition, and according to claim 1 wherein 0.2≦x≦0.5 and 0.5≦y≦1.0.

### Claim 3

A composition of matter useful as a phosphor in light emitting diodes, which comprises a material described by the formula:
ZnSxSey:Cu,A
in which x and y are each independently any value between 0 and about 1, subject to the proviso that the sum of x and y is equal to any number in the range of between about 0.75 and about 1.25; and subject to the proviso that x is not zero, wherein A comprises at least one additional element selected from the group consisting of: Ag, Ce, Tb, Cl, I, Mg, and Mn, including mixtures thereof, and wherein Cu is present in any amount between about 0.0001% and about 5% in mole percent based on the total molar weight of said composition, and wherein 0.001≦x≦0.5 and 0≦y≦0.5.

### Claim 4 (depends on 3)

A composition according to claim 3 wherein the total amount of A present is any amount between about 0.0001% and about 5% in mole percent based on the total molar weight of said composition.

### Claim 5

A composition of matter useful as a phosphor in light emitting diodes, which comprises a material described by the formula:
ZnSxSey:Cu,A
in which x and y are each independently any value between 0 and about 1, subject to the proviso that the sum of x and y is equal to any number in the range of between about 0.75 and about 1.25; and subject to the proviso that x is not zero, wherein A comprises at least one additional element selected from the group consisting of: Ag, Ce, Tb, Cl, I, Mg, and Mn, including mixtures thereof, and wherein Cu is present in any amount between about 0.0001% and about 5% in mole percent based on the total molar weight of said composition, and wherein 0.001≦x≦0.5 and 0.5≦y≦1.0.

### Claim 6 (depends on 5)

A composition according to claim 5 wherein the total amount of A present is any amount between about 0.0001% and about 5% in mole percent based on the total molar weight of said composition.