CaHPO₄:Tb³⁺ green nanophosphors were synthesized by a room-temperatur e co-precipitation method using ethanol as solvent.X-ray powder diffraction (XRD),scanning electron mic roscopy (SEM),photoluminescence spectroscopy (PL),thermal gravimetric (TG) and differential scanning calorimeter (DSC) techniques are utilized to investigate the structure,morphology,fluorescence performance and thermal stability of the obtained powders.The results show that the triclinic phase of CaHPO_4fo rmed at room temperature,while phase transformation could occur when annealing temperature reached 400℃,and eventually led to a pure tetragonal phase Ca₂P₂O_7at 500℃ or above.However,morphology and dispers ion of the samples were marginally altered after annealing treatment.Moreover,the luminescence propert ies of CaHPO₄:Tb³⁺ and Ca₂P₂O₇:Tb³⁺ are investigated through excitation and emission spect ra.Both samples exhibit characteristic emissions with several sharp peaks corresponding to the transitions ⁵D₄→⁷FJ (J=3－6) of Tb³⁺ at 370nm excitation,among which J=5,i.e.,the green  5D₄→⁷F₅ (544nm) transition dominates the fluorescence emissio n, and CaHPO₄:Tb³⁺ powders exhibit much stronger emission intensity than C a₂P₂O₇:Tb³⁺.