Synthesis and photophysical properties of europium pentafluorinated β-diketonate complexes

Red emissive ternary europium complexes: synthesis, optical, and luminescence characteristics

“…The substitution of hydrogen by fluorine enhances the luminescence by diminishing the nonradiative transitions, as well as increasing the Lewis acidity of the Ln ion. [16,17] The bonding of water or solvent molecules to the unsaturated complexes affects the photoluminescence properties due to high energy vibrators such as O-H, N-H of solvent units. [18,19] This problem can be reduced using auxiliary ligands that replace the solvent molecules from the coordination sphere of metal complexes.…”