Green-emitting phosphor particles, method for manufacturing green-emitting phosphor particles, color conversion sheet, light-emitting device, and image display device assembly
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.
1. A method for manufacturing green-emitting phosphor particles comprising the steps of:
producing a (Sr,Eu)SO 3 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-x Ga 2 S 4 :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)SO 3 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.
4. A method for manufacturing green-emitting phosphor particles comprising the steps of:
producing a (Sr,Eu)SO 3 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-x Ga 2 S 4 :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)SO 3 powder is produced by
adding the powdered gallium compound to the solution containing a europium compound and a strontium compound and
dropping a sulfite.
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.
8. The method for manufacturing green-emitting phosphor particles according to claim 4 ,
wherein the firing is performed in a hydrogen sulfide gas atmosphere.