With increasing concentrations of Cu and Al in ‐fired phosphors, the emission spectrum is shifted from green to orange under 3650 Å excitation. The emission of these triple Sulfides consists of three sub‐bands of such relative intensities that the presence of a single band is simulated. The bands have different temperature, decay, and excitation characteristics. Among other substituents, the elements Sc, Ce, Pr, and Nd are of interest, as they produce infrared stimulability even with high activator concentrations.