Phosphor, light emitting device, and method for producing phosphor
AssigneeDenka Company Limited
InventorsHideyuki Emoto, Motoi Tanaka, Kazuhiro Ito
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Abstract
Provided is a phosphor represented by the general formula: A2MF6:Mn. The elements A each represents an alkali metal element, the element M represents one or more tetravalent metallic elements selected from Si, Ge, Sn, Ti, Zr and Hf. The phosphor has a minimal light absorption rate in a wavelength range of 300 nm or more and 350 nm or less of 67% or less, and a maximum light absorption rate in a wavelength range of 400 nm or more and 500 nm or less of 65% or more. The phosphor has a Mn content of 0.3% by mass or more and 1.5% by mass or less.
Claims9
A phosphor represented by the general formula:
- A2MF6:Mn in which the elements A each represents an alkali metal element, the element M represents one or more tetravalent metallic elements selected from Si, Ge, Sn, Ti, Zr and Hf;
- the phosphor having a minimal light absorption rate in a wavelength range of 300 nm or more and 350 nm or less of 67% or less, and a maximum light absorption rate in a wavelength range of 400 nm or more and 500 nm or less of 65% or more, the phosphor having a Mn content of 0.3% by mass or more and 1.5% by mass or less.
A method for producing the phosphor according to claim comprising the steps of:
- dissolving raw materials in hydrofluoric acid to obtain an aqueous hydrofluoric acid solution;
- precipitating the phosphor in the solution after the dissolving step;
- and
- washing the phosphor to remove impurities,
- wherein the aqueous hydrofluoric acid solution obtained in the dissolving step contains the element A, the elements M, and Mn, and
- wherein the precipitation step comprises adding a poor solvent to the aqueous hydrofluoric acid solution.
Dependencies are inferred from the claim text.