A hydrothermal method had been employed firstly for the preparation of La_1-xPr_xVO₄ (x=0—0.05) nano-crystal phosphors, and then they were annealed at 600 ^oC for 4 h. The x-ray diffraction profiles show that the La_1-xPr_xVO₄ phosphors still keep the tetragonal structure. The SEM results show that phosphor particles were increased from 60 nm to 80 nm after annealing process, and the surface morphology gradually changed from reunion to uniform distribution. The excitation spectra show that an absorption band between 200 ~ 330 nm is due to the charge transfer from the oxygen ligands to the central vanadium atom inside the VO₄^3- anionic group, and the Pr³⁺ ion 4f-5d characteristic transition is located between in the 440 ~ 500 nm and 580 ~ 620 nm region. By 315 nm excitation, the main emission band still retains the characteristics for Pr³⁺ ion-doped LaVO₄ phosphor, belonging to the host luminescent, and the ¹D₂→³H₄, ³P₀→³H₆ electron transition of the Pr³⁺ ion, respectively. As the Pr³⁺ ion concentration increases, the color tone changes from blue ( 0 mol% Pr³⁺ ion doping ) to white (for 0.2-1 mol% Pr³⁺ ion doping), to blueish (for 5 mol% Pr³⁺ ion doping). Therefore, the color of the emission for (Y_1-xPr_x)InGe₂O₇ phosphors can be tuned by adjusting the Pr³⁺ ion concentration, without doping other color centers in a single phased host lattice. When the Pr³⁺ ion concentration of x=0.005, it possesses the strongest emission behavior, and is located in the white light region with a CIE chromaticity coordinates of x=0.299, y=258.