The novel phosphors of KSrPO4 doped with Eu2+, Tb3+, and Sm3+ were synthesized by solid-state reaction, and their luminescence properties were investigated. The phosphors show pure three-basal-color (red-green-blue) luminescence in the CIE1931 chromaticity diagram, and it was observed that the concentration quenching was dependent on the different dopant contents. This series of phosphate-based phosphors shows higher thermally stable luminescence, which was found to be better than commercially available Y3Al5O12:Ce3+ phosphor at temperatures higher than 200 degrees C. Considering the situation of high color-rendering index and chemical stability, we have demonstrated that KSrPO4:Ln (Ln=Eu, Tb, Sm) are potentially useful new scintillation materials for white-light-emitting diodes. (C) 2008 The Electrochemical Society.