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The aluminum based MOFs compound,MIL-96(Al),has been studied as a luminescence sensor by incorporating of Eu3+ ions,which renders the compound strong red-light emission.The as-synthesized MIL-96(Al)∶Eu3+ nanocrystals exhibit water dispersibility and environmental stability,which are general requirement for an ideal sensing material.The MIL-96(Al)∶Eu3+ nanocrystals show excellent selective detection ability on Fe3+ ions in aqueous solution with value of low detection limit 20 μM.Meanwhile,it also exhibits excellent selective detection ability on CrO42-and Cr2O72-in aqueous solution with value of low detection limit 10 and 22 μM,respectively.The results of this study show that MIL-96(Al)∶Eu3+ nanocrystals could be used as a multi-responsive luminescent senor for Fe3+ and Cr(Ⅵ) species in aqueous solution.The possible luminescence quenching mechanism has also been discussed.