Abstract: Luminescent rare earth complexes, particularly europium β-diketonates, have been intensively studied with respect to applications for luminescence. Recently, rare earth complexes have attracted considerable attention for organic electroluminescent(EL) devices as well as for optical microcavity emitters owing to their inherent extremely sharp emission bands and potentially high internal quantum efficiency. Their coordination polymers [Eu(Ⅲ)-DBM-PAA and NaEu(Ⅲ)-DBM-PSAA] were synthesized by the reaction of metal organic complex(NaEu(DBM)₄) with polyacrylic acid(M_n= 5 000) and copolymer of acrylic acid and styrene(M_n=3 000), the yields of Eu(Ⅲ)-DBM-PAA and NaEu(Ⅲ)-DBM-PSAA are about 89.7% and 87.3%, respectively. The coordination polymer was characterized by FTIR, UV, XPS and its composition and the structure were determinated. The result of electrical conductivity and elemental analysis indicate that each Eu(Ⅲ) ion is coordinated by carboxyl from two units in the Eu(Ⅲ)-DBM-PAA molecule or three units in the NaEu(Ⅲ)-DBM-PSAA molecule and one DBM^-. Their coordination polymer with Eu(Ⅲ) content reached up to 28.46% and 12.23%. The Eu-copolymer luminophores exhibited intense red light at 615 nm under UV excitation at room temperature, which is attributed to the ⁵D₀→ ⁷F₂ transition of Eu(Ⅲ) ions.

Key words: Europium, Complex, Coordination polymer, Fluorescence spectroscopy