Preparation And Properties Of The Fluorescene Resins Of Europium And The Organic Complexes Of Europium And Terbium Adulterated By Iron

The content of rare earth usually accounts for 10²0% by mass in the rare earth organic complexes.As the usage amount of rare earth is big and its price goes up in the international market, so the cost of production of the luminescent materals increased, and the their application areas were restricted. The usage amount of rare earth can be reduced in the production of the luminescent materals by adulterating the cheap and popular metal ions, the cost of production of the luminescent materals can decrease. In order to reduce the cost of production of rare earth fluorescence complexes and enhance their luminescent properties, we developed the following work:1. A series of fluorescence complexes of europium and terbium adulterated by the cheap and popular iron with the first ligand of aromatic carboxylic acid (benzoic acid, methoxybenzoic acid, m-chlorobenzoic acid, p-methylbenzoic acid, p-hydroxylbenzoic acid, salicylic acid, p-aminobenzoic acid, sulfosalicylic acid) and the second ligand of oleic acid and undecenoic acid have been synthesized under the optimisation conditions. Their molecular compositions and structures were characterized by means of elemental analysis, EDTA titrimetric method, FT-IR and UV spectroscopies. Their thermal properties were studied by thermal analysis instrument, and the sequence of thermal stability of the fluorescence complexes of terbium adulterated by iron is Tb_0.5Fe_0.5(MCBA)2(OA)·3H₂O > Tb_0.5Fe_0.5(PABA)2(UA)·3H₂O > Tb_0.5Fe_0.5(BA)2(U- A)·3H₂O > Tb_0.5Fe_0.5(PMBA)2(UA)·3H₂O > Tb_0.5Fe_0.5(SA)2(UA)·3H₂O > Tb_0.5Fe_0.5(S- SA)(UA)·2H₂O。The sequence of thermal stability of the fluorescence complexes of europium adulterated by iron is Eu_0.5Fe_0.5(MCBA)2(OA)·3H₂O > Eu_0.5Fe_0.5(PHBA)2(U- A)·3H₂O > Eu_0.5Fe_0.5(MBA)2(OA)·3H₂O > Eu_0.5Fe_0.5(PMBA)2(UA)·3H₂O. Their luminescent properties were investigated by means of fluorescence instrument, and the results indicate that the luminescence characteristics of the fluorescence complexes of europium and terbium adulterated by iron are similar to that of the unadulteration the fluorescence complexes of rare earth, and emit the characteristic fluorescence of europium and terbium, their fluorescence displayed red(green).2. The relationships between the luminescent intensity of the fluorescence complexes of europium and terbium adulterated by iron and the adulteration content of iron were studied by means of chart and table. The results indicate that the emission peaks of the fluorescence complexes of europium and terbium adulterated by iron changes little compared with that of corresponding fluorescence complexes, whichmeans the characteristic emission peaks of the rare earth is not affected by the addition of iron ions. The change rule is different when the adulteration content of iron is different, so the fluorescence enhancement factor R was introduced. We find the rules of effection of the adulteration content of iron on the fluorescence intensity of the objective complexes by means of factor R. The results show that the complexes that can produce fluorescence enhancement in the fluorescence complexes of terbium adulterated by iron are as follows: Tb_0.5Fe_0.5(PMBA)2(UA)·3H₂O, Tb_0.75Fe_0.25(MBA)2(UA)·3H₂O, Tb_0.75Fe_0.25(SA)2(UA)·3H₂O, Tb_0.75Fe_0.25(PM- BA)2(UA)·3H₂O, Tb_0.75Fe_0.25(PHBA)2(UA)·3H₂O, Tb_0.25Fe_0.75(SSA)(UA)·2H₂O, Tb_0.25Fe_0.75(PHBA)2(UA)·3H₂O, Tb_0.5Fe_0.5(SA)2(UA)·3H₂O, Tb_0.5Fe_0.5(MCBA)2(O- A)·3H₂O, Tb_0.75Fe_0.25(MCBA)2(OA)·3H₂O, Tb_0.25Fe_0.75(MCBA)2(OA)·3H₂O, Tb_0.75Fe_0.25(BA)2(OA)·3H₂O, Tb_0.75Fe_0.25(MBA)2(OA)·3H₂O and Tb_0.25Fe_0.75(BA)2(O- A)·3H₂O. The effect of fluorescence enhancement of Tb_0.5Fe_0.5(MCBA)2(OA)·3H₂O is the best. The complexes that can produce fluorescence enhancement in the fluorescence complexes of europium adulterated by iron are as follows: Eu_0.5Fe_0.5(PMBA)2(UA)·3H₂O,Eu_0.75Fe_0.25(PMBA)2(UA)·3H₂O,Eu_0.75Fe_0.25(BA)2(U- A)·3H₂O, Eu_0.25Fe_0.75(BA)2(UA)·3H₂O, Eu_0.75Fe_0.25(MBA)2(UA)·3H₂O, Eu_0.25Fe_0.75(PHBA)2(UA)·3H₂O, Eu_0.25Fe_0.75(BA)2(OA)·3H₂O, Eu_0.5Fe_0.5(BA)2(O- A)·3H₂O, Eu_0.75Fe_0.25(BA)2(OA)·3H₂O, Eu_0.25Fe_0.75(PMBA)2(OA)·3H₂O, Eu_0.5Fe_0.5(MBA)2(OA)·3H₂O, Tb_0.5Fe_0.5(PMBA)2(UA)·3H₂O, Tb_0.75Fe_0.25(MBA)2(U- A)·3H₂O, Tb_0.75Fe_0.25(SA)2(UA)·3H₂O, Tb_0.75Fe_0.25(PMBA)2(UA)·3H₂O, Tb_0.75Fe_0.25- (PHBA)2(UA)·3H₂O, Tb_0.25Fe_0.75(SSA)(UA)·2H₂O, Tb_0.25Fe_0.75(PHBA)2(UA)·3H₂O, Tb_0.5Fe_0.5(MCBA)2(OA)·3H₂O, Tb_0.75Fe_0.25(MCBA)2(OA)·3H₂O, Tb_0.25Fe_0.75(MC- BA)2(OA)·3H₂O, Tb_0.75Fe_0.25(BA)2(OA)·3H₂O, Tb_0.75Fe_0.25(MBA)2(OA)·3H₂O, Tb_0.25Fe_0.75(BA)2(OA)·3H₂O, Eu_0.5Fe_0.5(PMBA)2(UA)·3H₂O, Eu_0.75Fe_0.25(PMBA)2(U- A)·3H₂O, Eu_0.75Fe_0.25(BA)2(UA)·3H₂O, Eu_0.25Fe_0.75(BA)2(UA)·3H₂O, Eu_0.75Fe_0.25(M- BA)2(UA)·3H₂O and Eu_0.25Fe_0.75(PHBA)2(UA)·3H₂O. The effect of fluorescence enhancement of Eu_0.25Fe_0.75(BA)2(OA)·3H₂O is the best. All other complexes caused fluorescence quenching.3. We used p-benzene dicarboxylic acid and ethanediol as monomers, europium ion as central ion to fabricate the red fluorescence resin of polyethylene terephthalate of europium under the synthesis condition optimized by orthogonal experiment. Their molecular structures were characterized by FT-IR and UV spectroscopies. The viscosity- average molecular weight of the red fluorescence resin is 7063. The thermal stability and crystallization of the red fluorescence resin was investigated by thethermal analysis instrument, and the thermal stability of the red fluorescence resin of polyethylene terephthalate of europium was increased by the introduction of the rare earth ion. Their luminescent properties were investigated by means of fluorescence instrument, the results indicate that the red fluorescence resin of polyethylene terephthalate of europium emitted the characteristic peaks of 590nm(5D0—7F1) and 620nm(5D0—7F2) of europium ion, the characteristic fluorescence emission peak of 5D0—7F2 transition (620nm) of europium ion is the strongest in the emission spectra of the europium resin, their fluorescence displayes red.