A series of Pr³⁺ ions doped bismuth layered-structure ferroelectrics (BLS Fs) oxides CaBi₂Ta₂O_9powders were synthesized by a solid-state reaction method.Crystal structure and morphologie s of the samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM).The luminesc ent properties of the samples were analyzed by a spectrophotometer and a fluorescence spectrometer.The XRD res ults indicate that all the samples are the CaBi₂Ta₂O_9phase.The f-f transitions of Pr³⁺ ions are observed at 449～500nm through the absorption and excitation spectra of the samples.The emission spectra of the sa mples include a green band (525～575nm) and a red band (575～700nm),avoiding the reabsorption problem in the white LED.And as the increase of the Pr³⁺ ion concentration,the emission intensity increases first,and then decreases due to the concentration quenching effect.When the Pr³⁺ ion mole concentration is 2%, the emission intensity gets to the maximum.Through the investigation of the ther mal stability,the thermal activat ion energy of Ca0.98Pr0.02Bi₂Ta₂O_9is calculated to be 0.24eV.The CIE chromaticity coordination shows that the sa mples could be effectively excited by the blue light and could emit yellow light.The results suggest that the CBTO: Pr³⁺ could be used as a yellow phosphor excited by the blue LED chips.