Method of making long life electroluminescent phosphor
AssigneeOsram Sylvania Inc.
InventorsChen-Wen Fan, Richard G. W. Gingerich, Tuan Anh Dang, Dale E. Benjamin
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Abstract
A method of coating phosphor particles that comprises the steps of introducing an inert gas into a reaction vessel; charging phosphor particles into the reaction vessel; heating the reaction vessel to a reaction temperature; introducing a coating precursor into the reaction vessel; introducing an oxygen/ozone mixture into the reaction vessel; and maintaining the agitation, inert gas flow, oxygen/ozone mixture flow and precursor supply for a time sufficient to coat the phosphor particles. This process yields phosphors having a half-life of upwards of 3,100 hours with efficacys of greater than 6 lumens per watt (lm/w).
Claims10
In a method of coating phosphor particles, the steps comprising:
- introducing an inert gas into a reaction vessel;
- charging phosphor particles into said reaction;
- heating said reaction vessel to a reaction temperature;
- introducing a coating precursor into said reaction vessel;
- introducing an oxygen/ozone mixture into said reaction vessel;
- and maintaining said inert gas flow, oxygen/ozone mixture flow and precursor supply for a time sufficient to coat said phosphor particles.
Dependencies are inferred from the claim text.