Tb³⁺–Sm³⁺co-doped Ba₃NaLa(PO₄)₃F phosphors with apatite structure have been prepared by a high temperature solid-state reaction, and their luminescence properties have been investigated in detail. As a result of fine-tuning of the emission composition of the Tb³⁺ and ³⁺ ions, tunable luminescence properties can be realized by combining the emission of Tb³⁺ and Sm³⁺ in a single host lattice under UV light excitation. The emission color of the obtained phosphors can be modulated from green to yellow by controlling the doping content of the Sm³⁺ ions with the fixed Tb³⁺ content. These results indicate the series of phosphors can be acted as a good candidate for the application in white light-emitting diodes.