Effect of ancillary ligands on visible and NIR luminescence of Smβ-diketonate complexes.

Two new Sm complexes with pyrazolic β-diketones bearing a CF group acting as main ligands and with 2,2'-bipyridine or 1,10-phenanthroline being the ancillary ligand were studied, and their energy level structure was established. Stark splitting observed in the photoluminescence spectra of the complexes points to their non-cubic symmetry, confirmed by the calculated Judd-Ofelt intensity parameters. Internal quantum yields obtained for the compounds by the Judd-Ofelt calculations were of the order of 5.

Luminescence properties of pyrazolic 1,3-diketone Ho complex with 1,10-phenanthroline.

We performed spectroscopic investigations of a novel tris(1,3-bis(1,3-dimethyl-1H-pyrazol-4-yl)propane-1,3-dionato)(1,10-phenanthroline) holmium (III) complex. It was demonstrated that bonding the corresponding ligand environment to Ho results in sensitization of the luminescence of the complex. The luminescence decay of the complex exhibits a biexponential behaviour.