Claims
- 1. A method for producing a single-component calcium halophosphate phosphor having an CRI of at least 69 which comprises the steps of:(a) combining a source of phosphate, a source of calcium, a source of fluoride, a source of chloride, a source of manganese, and a source of antimony materials, wherein the said materials are combined in a metals-to-phosphate (Ca+Mn) ratio of about 9.890 (based on six phosphate ions), and the moles of the materials, based on six phosphate ions, are about 0.142 manganese, about 0.904 calcium, about 0.146 chloride, and about 0.062 antimony, respectively; (b) firing the mixture of combined materials at a temperature to form a friable calcium halophosphate phosphor activated with antimony and manganese.
- 2. A method as claimed in claim 1 wherein the calcium halophosphate has the formulaCa5−x−ySbxMny(PO4)3ClzF1−x−z wherein x, y and z are integers as follows: x is from about 0.032 to 0.037; y is from about 0.06 to 0.14; and z is about 0.025 to 0.05.
- 3. A method as claimed in claim 1 wherein the calcium halophosphate is a calcium chlorofluorophosphate phosphor activated by antimony and manganese and selected from compounds having the formula:Ca4.52Sb0.037Mn0.06(PO4)3Cl0.05F0.426 (a) andCa4.52Sb0.032Mn0.14(PO4)3Cl0.025F0.452. (b)
- 4. A method as claimed in claim 1 wherein the friable calcium halophosphate phosphor is subjected to a size reduction step to yield a phosphor having a medium particle size of about 9.5 to 11 μm and a CRI of about 75.
- 5. A method for the production of a single-component phosphor having an CRI of at least 69 which comprises the steps of:combining dicalcium phosphate, calcium carbonate, calcium fluoride, ammonium chloride, manganese carbonate; and antimony oxide; wherein said materials are present in a metals-to-phosphate (Ca+Mn) ratio of about 9.890 (based on six phosphate ions) and the moles of the reactants, based on six phosphate ions, are about 0.142 manganese, about 0.904 fluoride, about 0.146 chloride, and about 0.062 antimony, and about 6 moles dicalcium phosphate, respectively; (b) firing the mixture at a temperature to form a friable calcium halophosphate phosphor activated with antimony and manganese, preferably having the formula Ca5−x−ySbxMny(PO4)3ClzF1−x−z wherein x, y and z are integers as follows: x is from about 0.032 to 0.037; y is from about 0.06 to 0.14; and z is about 0.025 to 0.05.
- 6. A method as claimed in claim 5 wherein the phosphor is a calcium chlorofluorophosphate phosphor activated by antimony and manganese and selected from compounds having the formula:Ca4.52Sb0.037Mn0.06(PO4)3Cl0.05F0.426 (a) andCa4.52Sb0.032Mn0.14(PO4)3Cl0.025F0.452. (b)
- 7. A method as claimed in claim 5 wherein the friable calcium halophosphate phosphor is subjected to a size reduction step to yield a phosphor having a number average particle size of about 9.5 to 11 μm and a CRI of about 75.
- 8. A method as claimed in claim 6 wherein the friable calcium halophosphate phosphor is subjected to a size reduction step to yield a phosphor having a number average particle size of about 6.3 μm and a CRI of about 75.
- 9. A method as claimed in claim 5 wherein the calcium carbonate is mined calcium carbonate.
Parent Case Info
This is a divisional of application Ser. No. 09/651,047, filed Aug. 30, 2000, now U.S. Pat. No. 6,483,234.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
6483234 |
Milewski |
Nov 2002 |
B1 |