Green-emitting phosphor particles, method for manufacturing green-emitting phosphor particles, color conversion sheet, light-emitting device, and image display device assembly

• US 9,181,476 B2
• Filed: 05/03/2011
• Issued: 11/10/2015
• Est. Priority Date: 05/10/2010
• Status: Active Grant

• Current Assignee: Sony Chemical & Information Device Corporation (Sony Group Corp.)
• Original Assignee: Dexerials Corporation
• Inventors: Izawa, Takamasa, Kusunoki, Tsuneo, Igarashi, Takahiro
• Primary Examiner(s): Koslow, Carol M
• Application Number:
  US13/099,461
• Publication Number:
  US 20110273864A1
• Time in Patent Office: 1,652 Days
• Field of Search: 252/301.4 S, 252/301.4 R
• US Class Current: 1/1
• CPC Class Codes: C09K 11/7731 with alkaline earth metals
• CPC Class Codes: C09K 11/7741 Sulfates
• CPC Class Codes: F21K 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• CPC Class Codes: F21V 13/14 the elements being filters or photoluminescent elements, reflectors and refractors
• CPC Class Codes: F21V 9/30 Elements containing photoluminescent material distinct from or spaced from the light source shades F21V1/17; globes, bowls or cover glasses F21V3/08, F21V3/12; refractors F21V5/10; reflectors F21V7/26, F21V7/30; elements with provision for controlling the spectral properties or intensity F21V9/40
• CPC Class Codes: G02B 5/201 in the form of arrays
• CPC Class Codes: H01L 2224/45144 Gold (Au) as principal constituent
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/13091 Metal-Oxide-Semiconductor Field-Effect Transistor [MOSFET]
• CPC Class Codes: H01L 33/502 Wavelength conversion materials
• CPC Class Codes: H01L 33/504 Elements with two or more wavelength conversion materials
• CPC Class Codes: H01L 33/505 characterised by the shape, e.g. plate or foil

Abstract

A method for manufacturing green-emitting phosphor particles including the steps of producing a powder containing europium and strontium from a solution containing a europium compound and a strontium compound, mixing the resulting powder and a powdered gallium compound, and performing firing.

Claims

1. A method for manufacturing green-emitting phosphor particles comprising the steps of:

producing a (Sr,Eu)SO₃ powder containing europium and strontium from a solution containing a europium compound, a strontium compound, and a sulfur compound;

mixing the resulting powder and a powdered gallium compound; and

performing firing,

wherein the green-emitting phosphor articles comprise Sr_1-xGa₂S₄;

Eu_x (where 0.10≦

x≦

0.20) and

the value of (internal quantum efficiency/absorption efficiency) is 0.7 or more.

2. The method for manufacturing green-emitting phosphor particles according to claim 1,

wherein the (Sr,Eu)SO₃ powder is produced by dropping a sulfite into the solution containing a europium compound and a strontium compound.

3. The method for manufacturing green-emitting phosphor particles according to claim 1,

wherein the mixing of the powder and the powdered gallium compound is performed by using a ball mill.

6. The method for manufacturing green-emitting phosphor particles according to claim 1,

wherein the firing is performed in a hydrogen sulfide gas atmosphere.

7. The method for manufacturing green-emitting phosphor particles according to claim 2,

wherein the mixing of the powder and the powdered gallium compound is performed by using a ball mill.

4. A method for manufacturing green-emitting phosphor particles comprising the steps of:

producing a (Sr,Eu)SO₃ powder by

adding a powdered gallium compound to a solution containing a europium compound, a strontium compound, and a sulfur compound, and

adding a salt to precipitate the europium compound and the strontium compound; and

firing the resulting powder,

wherein the green-emitting phosphor particles comprise Sr_1-xGa₂S₄;

Eu_x (where 0.10≦

x≦

0.20) and

the value of (internal quantum efficiency/absorption efficiency) is 0.7 or more.

5. The method for manufacturing green-emitting phosphor particles according to claim 4,

wherein the (Sr,Eu)SO₃ powder is produced by

adding the powdered gallium compound to the solution containing a europium compound and a strontium compound and

dropping a sulfite.

8. The method for manufacturing green-emitting phosphor particles according to claim 4,

wherein the firing is performed in a hydrogen sulfide gas atmosphere.