Claims
- 1. A method for making a phosphor material comprising:
- 1) mixing, in an aqueous medium, zinc oxide, silica gel.sub.2 and manganese carbonate to prepare an aqueous suspension;
- 2) drying said aqueous suspension; and
- 3) treating the dried aqueous suspension in an oven at a temperature that is a function of the manganese content in said aqueous suspension.
- 2. A method according to claim 1, wherein the manganese content is between 5% and 25%.
- 3. A method according to claim 2, wherein the temperature of oven treatment has a value:
- of about 1300.degree. C. for a manganese content of 0% to 15%
- that is substantially a linear function, between 1150.degree. C. and 1300.degree. C., of the manganese content when said manganese content is from 15% to 20%;
- of about 1150.degree. C. for a manganese content of about 20% to 25%.
- 4. A method according to claim 3 wherein, when the manganese content is from 15% to 20%, the temperature of the oven treatment is about 1200.degree. C.
- 5. A method according to claim 3, wherein the period of the oven treatment is about 4 hours.
- 6. A method according to claim 1, wherein the aqueous mixture comprises only an aqueous medium, zinc oxide ZnO, silica gel SiO.sub.2 and manganese carbonate MnCO.sub.3 to the exclusion of any other product.
- 7. A method for making a phosphor material comprising:
- 1) mixing, in an aqueous medium, zinc oxide, silica gel.sub.2 and manganese carbonate to prepare an aqueous suspension;
- 2) drying said aqueous suspension; and
- 3) treating the dried aqueous suspension in an oven at a temperature that is a function of the manganese content in said aqueous suspension,
- wherein said manganese content is between 5% and 25% and said temperature of oven treatment has a value:
- of about 1300.degree. C. for a manganese content for 5% to 15%;
- that is substantially a linear function, between 1150.degree. C. and 1300.degree. C., of the manganese content when said mangasese content is from 15% to 20%;
- of about 1150.degree. C. for a manganese content of about 20% to 25%.
Priority Claims (1)
Number |
Date |
Country |
Kind |
91 07075 |
Jun 1991 |
FRX |
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Parent Case Info
This is a division of application Ser. No. 08/433,032 filed on May 3, 1995, now U.S. Pat. No. 5,518,655 which is a continuation of Ser. No. 08/224,187 filed on Apr. 7, 1994, abandoned, which is a continuation of Ser. No. 07/896,973, filed on Jun. 11, 1992, abandoned.
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2222509 |
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3541019 |
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Divisions (1)
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Number |
Date |
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Parent |
433032 |
May 1995 |
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Continuations (2)
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Number |
Date |
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Parent |
224187 |
Apr 1994 |
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Parent |
896973 |
Jun 1992 |
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