Synthesis, Characterization And Fluorescent Studies Of Zn(Ⅱ) / Cu(Ⅱ) And Rare Earth Complexes

Organic electroluminescence (OEL) materials have become a fascinating research field in recent years because of their potential applications in panel displayer. With satisfactory light function, the compounds of hydrazone have potential applications in OEL materials. Rare earth (RE) complexes are a kind of electroluminescence materials with special light and physical properties among many OEL materials. They have been payed more and more attention from many investigators due to their high fluorescence efficiency, narrow bandwidth and good purity of light. Four novel complexes of type [M(L)2] [L = 2-acetonaphthonebenzoylhydrazone (a), M = Zn(II) (a1), Cu(II) (a2); L = 2-nitrobenzaldehydebenzoylhydrazone (b), M = Cu(II) (b1); L = 4'-bromoacetophenonebenzoylhydrazone (c), M = Cu(II) (c1).] have been synthesized conveniently by the reactions of zinc(II) acetate dihydrate/copper(II) acetate monohydrate with appropriate hydrazone ligands which were synthesized by condensation reactions of benzhydrazide with aldehyde or ketone in methanol. The complexes obtained have been characterized by elemental analysis, IR, UV, 1H NMR, 13C{H} NMR and Single crystal X-ray analysis. The influences of different metal ions and different ligands on luminescent properties of complexes have been studied. The energy-band parameters of complex a1 have been explored by cyclic voltammetry. Furthermore, fourteen new RE complexes have been prepared by usingβ-naphthoylbenzoylmethane (β-HNBM), 5,6-quinone-l,10-phenanthroline (QPT) and different rare ions. Elemental analysis and RE coordination titration indicate that the composition of ternary complex is Eu(β-NBM)3QPT; the composition of the series of Eu³⁺ doped with different RE ions has this type molecular formula: Eu0.5RE0.5(β-NBM)3QPT (RE = Er³⁺, Nd³⁺, Ce³⁺, Dy³⁺, Y³⁺, Lu³⁺); there are two groups of the series of Eu³⁺ complexes doped with different proportional RE ions, namely, Eu1-xYx(β-NBM)3QPT and Eu1-xLux(β-NBM)3QPT (x = 0.10, 0.30, 0.50, 0.70, 0.90). The best fluorescence intensity has been studied in this thesis according to different proportional doped RE ions. According to photoluminescence (fluorescence spectra), the electroluminescence properties of the complexes have been discussed.