FLUORESCENT POWDER, PROCESS FOR PRODUCING THE SAME, DISPLAY PANEL, AND FLAT DISPLAY

摘要

A phosphor powder is composed of a host material made of an element coming under the group II of the periodic table and an element coming under the group VI of the periodic table, an activator and a co-activator, the amount ratio of the activator to the host material is 1 x 10<-4> to 1 x 10<-3> parts by weight when the amount ratio of the host material is 1 part by weight, and the co-activator has a molar concentration equal to a molar concentration of the activator.