Photosensitized Near-Infrared Luminescence of Yb(III) Complexes Containing Phenanthroline Derivatives

Abstract

Near-IR emission of novel Yb(III) complexes with phenanthroline derivertives, bis(phenanthroline)-tris(bis-perfluoromethanesurfonyliminate)ytterbium [Yb(pms)3(phen)2] and dipyridophenazine-tris(bis-perfluoromethanesurfonyliminate)ytterbium [Yb(pms)3(dip)] are studied in dimethylsulfoxide [DMSO-d6]. The emission quantum yields of Yb(pms)3(phen)2 and Yb(pms)3(dipy-phenazine) excited at 940 nm (2F7/2–2F5/2 transition) were found to be 7.4 and 9.1%, respectively. We successfully observed the photosensitized near-infrared emission from the Yb(III) complexes upon excitation of the aromatic ligands. The energy transfer efficiencies of Yb(pms)3(phen)2 and Yb(pms)3(dip) excited at 310 nm (π–π* transition) were evaluated to be 9.1 and 4.0%, respectively.