YVO4 , YPO4 and YV1 - xPxO4 phosphors with various Tb3 + doping concentrations were prepared by high-temperature solid-state method. Differential scanning calorimetry (DSC) measurements were conducted to evaluate the chemical reactions during synthesis process, determining 1 350 ℃ as the optimal synthesis temperature. X-ray diffraction (XRD) analysis of the synthesized materials confirmed a tetragonal crystal structure for all samples. The luminescent properties of the mentioned phosphors at room temperature were investigated. Under ultraviolet excitation, luminescence in YVO4 ∶ Tb3 + predominantly arises from the 5D3→7FJ(J = 6, 5, 4, 2) transitions, resulting in blue emission. The introduction of P element modified the crystal field environment in YV1 - xPxO4 ∶Tb3 + , enhancing multi-phonon relaxation (MPR) and cross-relaxation (CR) between 5D3 and 5D4 energy levels. With increasing P element content, the emission gradually shifted towards 5D4→7FJ′(J′ = 6, 5, 4, 3), displaying blue, cyan, and green emissions. In YPO4 ∶ Tb3 + , higher doping concentrations enhanced cross relaxation between 5D3 and 5D4 energy levels of Tb3 + , leading to weakened 5D3 luminescence and intensified 5D4 luminescence. Fine- tuning the doping concentration enabled the control of luminescence from blue to green. In conclusion, by adjusting the matrix composition and doping concentration, the blue-green luminescence modulation of Tb3 + -doped vanadium phosphate system can be achieved.