Synthesis and Luminescence Properties of Three Europium Complexes with Phenanthroline Derivatives and β-Diketonates

摘要

Three novel Eu-complexes based on phenanthroline derivatives as second ligands have been synthesized and characterized by element analysis, ~1H NMR, FT-IR, UV-vis, and PL. The luminescence spectra presented characteristic emission lines of Eu~(3+) ion. The results of luminescence spectra indicated that the Eu~(3+) ion occupied only a single site, and the ligand filed surrounding the Eu~(3+) ion was highly polarizable. Meanwhile, all complexes exhibited relative high luminescence quantum efficiency (η). Among these Eu-complexes, the complex Eu(DBM)_3HPIP exhibited the lowest quantum efficiency due to the presence of O-H oscillators in this complex, the result indicated different phenanthroline derivatives as second ligands can significantly influence the luminescence properties of Eu-complexes.