PHOSPHORS PROTECTED AGAINST MOISTURE AND LED LIGHTING DEVICES

摘要

The present invention provides-a photoluminescent phosphor coated with a coating of oxide, the phosphor comprising (1) an inorganic phosphor chosen from (a) a metal thiogallate phosphor and (b) a metal sulfide phosphor and (2) a coating that comprises at least one layer having at least one oxides. The coated photoluminescent phosphor of the present invention is more resistant to water-induced degradation than when it is uncoated.