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US 10,093,853 B2Granted
Green phosphor and production method therefor, phosphor sheet, and illumination device
AssigneeDexerials Corporation
InventorKazuhiro Yagihashi
Life of this patent
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Abstract
Provided is a green phosphor having high conversion efficiency. The green phosphor is represented by the composition formula (Sr1-yCay)1-xGa2S4:Eux (0.03≤x≤0.20 and 0<y≤1). A full width at half maximum of a diffraction peak corresponding to a (422) plane in an XRD pattern is less than 0.18.
Claims7
A green phosphor represented by the composition formula (Sr1-yCay)1-xGa2S4:Eux, where 0.03≤x≤0.20 and 0<y≤1, wherein
- a full width at half maximum of a diffraction peak corresponding to a (422) plane in an XRD pattern using a CuKα ray is less than 0.18.
A phosphor sheet, comprising:
- moisture vapor barrier films;
- and
- a phosphor layer sandwiched between the moisture vapor barrier films, wherein
- the phosphor layer contains a green phosphor and a red phosphor, the green phosphor being represented by the composition formula (Sr1-yCay)1-xGa2S4:Eux, where 0.03≤x≤0.20 and 0<y≤1, and having a full width at half maximum of a diffraction peak corresponding to a (422) plane in an XRD pattern using a CuKα ray of less than 0.18.
1 more element
A method of producing a green phosphor, comprising the steps of:
- dripping a mixed solution containing a europium compound, a strontium compound, and a calcium compound into a sulfite solution to which a powdered gallium compound is added;
- and
- firing, after a sulfite powdered mixture containing Sr, Ca, Eu, and Ga is prepared, the prepared powdered mixture to produce a green phosphor represented by the composition formula (Sr1-yCay)1-xGa2S4:Eux, where 0.03≤x≤0.20 and 0<y≤1.
Dependencies are inferred from the claim text.