Judd-Ofelt characterization and energy transfer mechanism of highly luminescent europium(III) complexes with 1-(5-chloro-2-hydroxyphenyl)-1,3-butanedione

摘要

Graphical abstractA series of luminescent europium(III) complexes have been synthesized by involving a β-diketone ligand 1-(5-chloro-2-hydroxyphenyl)-1,3-butanedione (CHPB) and four ancillary ligands. The luminescence properties of complexes suggesting good sensitization effect of ligand and favorable position of triplet state of ligand and coligand from the emitting levels of metal ion. The proposed energy transfer mechanism indicates high luminescence properties of complexes. The luminescence quantum efficiencies and Judd-Ofelt intensity parameter Ω2of the complexes also determined.Display OmittedHighlights?Complexes have been characterized by IR,1H NMR and UV–visible spectroscopy.?The luminescence properties reveal higher luminescence of complexes.?The Judd-Ofelt intensity parameters of europium(III) complex have been studied.?Energy transfer mechanism