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US 8,974,696 B2Granted
Preparation of complex fluoride and complex fluoride phosphor
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsMasami Kaneyoshi, Yasushi Takai
Life of this patent
Estimating the term…
Abstract
A complex fluoride A2MF6 wherein M is a tetravalent element Si, Ti, Zr, Hf, Ge or Sn, A is an alkali metal Li, Na, K, Rb or Cs is prepared by providing a first solution containing a fluoride of M, providing a second solution containing a compound of A and/or the compound of A in solid form, mixing the first solution with the second solution and/or the solid for reacting the fluoride of M with the compound of A, and recovering the resulting solid product via solid-liquid separation.
Claims11
A method for preparing a complex fluoride having the formula (1):
- A2MF6 (1)
- wherein M is at least one tetravalent element selected from the group consisting of Si, Ti, Hf, Ge, and Sn, A is at least one alkali metal selected from the group consisting of Li, Na, K, Rb, and Cs, said method comprising the steps of:
- providing a first solution containing a fluoride of tetravalent element M, hydrogenfluoride, and water,
- providing a second solution containing a compound of alkali metal A and/or the compound of alkali metal A in solid form, the compound of alkali metal A being selected from the group consisting of a fluoride, hydrogenfluoride, nitrate, sulfate, hydrogensulfate, carbonate, hydrogencarbonate, and hydroxide,
- mixing the first solution with the second solution and/or the solid for reacting the fluoride of tetravalent element M with the compound of alkali metal A to form a solid product, and
- recovering the solid product via solid-liquid separation.
3 more elements
A method for preparing a complex fluoride phosphor having the formula (2):
- A12MF6:Mn (2)
- wherein M is at least one tetravalent element selected from the group consisting of Si, Ti, Zr, Hf, Ge, and Sn, A1 is at least one alkali metal selected from the group consisting of Li, Na, K, Rb, and Cs, and invariably contains Na and/or K, said method comprising the steps of:
- providing a first solution containing a fluoride of tetravalent element M,
- providing a second solution containing a compound of alkali metal A and/or the compound of alkali metal A in solid form, wherein A is at least one alkali metal selected from the group consisting of Li, Na, K, Rb, and Cs, the compound of alkali metal A being selected from the group consisting of a fluoride, hydrogenfluoride, nitrate, sulfate, hydrogensulfate, carbonate, hydrogencarbonate, and hydroxide,
- adding at least one of manganese compounds, Na2MnF6 and K2MnF6 to at least one of the first solution and the second solution and/or the solid,
- mixing the first solution with the second solution and/or the solid for reacting the fluoride of tetravalent element M with the compound of alkali metal A and the manganese compound to form a solid product, and
- recovering the solid product via solid-liquid separation.
4 more elements
A method for preparing a complex fluoride having the formula (1):
- A2MF6 (1)
- wherein M is at least one tetravalent element selected from the group consisting of Si, Ti, Zr, Hf, Ge, and Sn, A is at least one alkali metal selected from the group consisting of Li, K, Rb, and Cs, said method comprising the steps of:
- providing a first solution containing a fluoride of tetravalent element M, hydrogenfluoride, and water,
- providing a second solution containing a compound of alkali metal A and/or the compound of alkali metal A in solid form, the compound of alkali metal A being selected from the group consisting of a fluoride, hydrogenfluoride, nitrate, sulfate, hydrogensulfate, carbonate, hydrogencarbonate, and hydroxide,
- mixing the first solution with the second solution and/or the solid for reacting the fluoride of tetravalent element M with the compound of alkali metal A to form a solid product, and
- recovering the solid product via solid-liquid separation.
3 more elements
A method for preparing a complex fluoride having the formula (1):
- A2MF6 (1)
- wherein M is at least one tetravalent element selected from the group consisting of Si, Ti, Zr, Hf, Ge, and Sn, A is at least one alkali metal selected from the group consisting of Li, Na, K, Rb, and Cs, said method comprising the steps of;
- providing a first solution containing a fluoride of tetravalent element M, hydrogenfluoride, and water, wherein the concentration of the fluoride of tetravalent element M is 0.1 to 3 mol/liter,
- providing a second solution containing a compound of alkali metal A and/or the compound of alkali metal A in solid form, the compound of alkali metal A being selected from the group consisting of a fluoride, hydrogenfluoride, nitrate, sulfate, hydrogensulfate, carbonate, hydrogencarbonate, and hydroxide,
- mixing the first solution with the second solution and/or the solid for reacting the fluoride of tetravalent element M with the compound of alkali metal A to form a solid product, and recovering the solid product via solid-liquid separation.
2 more elements
Dependencies are inferred from the claim text.