Moisture insensitive electroluminescent phosphor

Abstract From the Canadian patent

A phosphor particle having thereon a conformal coating of aluminum nitride. By conformal coating is meant a coating that follows the surface contours of the individual, particles. The method of making such phosphors 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 nitride coating, precursor into the reaction vessel; introducing a coreactant into the reaction vessel; and, maintaining the inert gas flow coreactant flow and precursor supply for a time sufficient, to coat the phosphor particles. The nitride coated phosphor particles produced …