This letter reports the novel three emission bands based on phosphate host matrix, KBaPO 4 doped with Eu 2+ , Tb 3+ , and Sm 3+ for white light-emitting diodes (LEDs). The phosphors were synthesized by solid-state reaction and thermal stability was elucidated by measuring photoluminescence at higher temperatures. Eu 2+ -doped KBaPO 4 phosphor emits blue luminescence with a peak wavelength at 420nm under maximum near-ultraviolet excitation of 360nm. Tb 3+ -doped KBaPO 4 phosphor emits green luminescence with a peak wavelength at 540nm under maximum near-ultraviolet excitation of 370nm. Sm 3+ -doped KBaPO 4 phosphor emits orange–red luminescence with a peak wavelength at 594nm under maximum near-ultraviolet excitation of 400nm. The thermal stabilities of KBaPO 4 :Ln (Ln=Eu 2+ , Tb 3+ , Sm 3+ ), in comparison to commercially available YAG:Ce 3+ phosphor were found to be higher in a wide temperature range of 25–300°C.