YELLOW EMITTING PHOSPHORS, PROCESS FOR PRODUCING SAME AND A FLUORESCENT LAMP CONTAINING SAME

摘要

Yellow emitting fluorescent lamp phosphors comprise cerium and manganese activated calcium-strontium fluoroapatite compositions represented by the approximate formula < IMG > wherein t is from 0 to l v is from about 4.12 to about 4.30 w is about 0.295 Y is from about 0.147 to about 0.295 y is about 3.0 z is from about 1.72 to about 2.21. An improved two step firing process for producing the disclosed phosphors is described and an improved fluorescent lamp employing the disclosed phosphors is also described.