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Novel soft materials,Eu(Ⅲ)-containing complex dissolved in [C8mim][X] (X=Cl-,PF6- and Tf2N-) ionic liquids,were synthesized.FT-IR and elementary analysis of complex proved that the molecular formula is [C8mim][Eu(TTA)4].The complex and ionic liquids had high thermal stability according to TGA.The photoluminescence spectra showed that the [C8mim][Eu(TTA)4] exhibited typical red emission deriving from 5Do-7F2 transition.After dissolving the complex in [C8mim][X] (X=Cl-,PF6-and Tf2N-) ionic liquids,the luminescence intensity decreased in the following order.[Csmim][Tf2N]≈[C8mim][PF6 ]＞[C8mim][C1].This was because Tf2N- and PF6- anions had larger molecular volume and weaker coordination ability than Cl-.