Patent Number: 6,309,700

Title: Method of making long life electroluminescent phosphor

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).

Inventors: Fan; Chen-Wen (Sayre, PA), Gingerich; Richard G. W. (Towanda, PA), Dang; Tuan Anh (Sayre, PA), Benjamin; Dale E. (Athens, PA)

Assignee: Osram Sylvania Inc.

International Classification: C09K 11/02 (20060101); B05D 007/00 (); B32B 005/16 ()

Expiration Date: 10/30/2018