Abstract: The tetragonal phase of flower-like rare-earth-doped CaWO4 nanostructures have been solvothermally synthesized in a binary solution of water and ethylamine.The effects of the mix ratio of water and ethylamine，sintering temperature，and the different types of rare earth-doped CaWO4 on luminescence of CaWO4：Tb3+ were investigated in detail.The structure，morphology，and performance of the as-prepared samples were characterized by XRD，SEM，FT-IR，and PL.Then the growth mechanism for the formation of flower-like CaWO4：Tb3+ nanostructures was described.Results revealed that flower-like rare- earth-doped CaWO4 nanostructures obtained by solvothermal treatment at 160 ℃ for 24 h，in water and ethylamine with the volume ratio of 1∶2 solvent，and then sintered at the temperature of 800 ℃.The different types of rare earth-doped CaWO4 showed different color luminescences with the excitation of UV light.

Key words: flower-like CaWO4, rare earth-doping, solvothermal process, luminescence properties