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A series of Tb-based metal-organic frameworks (Tb-MOFs) were successfully synthesized by a solvothermal method.The size and morphology of the as-obtained Tb-MOFs can be effectively controlled via regulating the experimental conditions such as the volume fraction of DMF and the molar ratio of Tb3+ to NaOH.It is found that all the samples exhibit strong green emissions under ultraviolet excitation,corresponding to 5D4 → 7FJ transitions of Tb3+.Interestingly,Tb-MOFs displayed an efficient and distinct luminescence quenching by Cu2+ in aqueous solutions.The competitive fluorescence detection experiments indicate that these Tb-MOFs sensors can be used as a high selective and sensitive sensor of Cu2+ detection with the detection limit of 10 μmol·L-1,which can be used as a promising fluorescence sensor for Cu2+ detection in daily life.