Claims
- 1. In a method of coating electroluminescent phosphor particles, the steps comprising: introducing an inert gas into a reaction vessel; charging phosphor particles into said reaction vessel; heating said reaction vessel to a reaction temperature; introducing a coating precursor which includes carbon into said reaction vessel for a time sufficient to saturate said phosphor particles with said precursor; continuing precursor flow into said reaction vessel; introducing an oxygen/ozone mixture into said reaction vessel, said oxygen/ozone mixture comprising less than 4.4 wt. % ozone; and maintaining said inert gas flow, oxygen/ozone mixture flow and further precursor supply to allow said oxygen/ozone mixture to react with said precursor for a time sufficient to coat said electroluminescent phosphor particles with a coating containing from 2200 to 6300 ppm carbon.
- 2. The method of claim 1 wherein said precursor is trimethylaluminum.
- 3. The method of claim 1 wherein said oxygen/ozone mixture comprises about 2 to about 4.3 wt. % ozone.
- 4. The method of claim 1 wherein said inert gas is nitrogen.
- 5. The method of claim 1 wherein said reaction temperature is about 180° C. and said time to saturation is about 10 minutes.
- 6. The method of claim 1 wherein said time sufficient to coat said phosphor is between about 40 to about 70 hours.
- 7. The method of claim 1 wherein said phosphor particles are charged into said reaction vessel with agitation.
- 8. The method of claim 7 wherein said agitation is maintained during said introduction of said oxygen/ozone mixture.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application claims the benefit of Provisional Application Ser. No.: 60/087,739, filed Jun. 20, 1998 and is a divisional application of Ser. No. 09/243,674, filed Feb. 2, 1999 now U.S. Pat. No. 6,361,864.
Ser. No. 09/177,226, filed Oct. 22, 1998, now abandoned, and claiming priority from Ser. No. 60/087,697, filed Jun. 2, 1998, and Ser. No. 09/153,978, filed Sep. 16, 1998 now abandoned and claiming priority from Ser. No. 60/065,950, filed Oct. 27, 1997 contain related subject matter. The disclosures of both are assigned to the assignee of the present invention and the teachings thereof are hereby incorporated by reference.
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Provisional Applications (1)
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Number |
Date |
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|
60/087739 |
Jun 1998 |
US |