FLUORESCENT SUBSTANCE

摘要

PROBLEM TO BE SOLVED: To provide a fluorescent substance having high luminous efficiency when exited by low-velocity electron rays. SOLUTION: This fluorescent substance is expressed by the general formula: (Sr1-x Cax ) In1-y My }2 O4 :Pr (M is at least one element selected from a group comprising Sc and B; 0<=x<=1.0; and 0.01<=y<=0.1).