Synthesis, structure and radiative and nonradiative properties of a new Dy3+ complex with sulfonylamidophosphate ligand

In recent years there has been growing interest in lanthanide-based multifunctional materials that exhibit interesting photophysical properties. This work presents spectroscopic and crystallographic characterization of a new dysprosium complex with sulfonylamidophosphate ligand. The crystal structure of [NaDy(SP)4]2·i-PrOH was determined and refined. It turns out that the Dy(III) complex is not isostructural with earlier reported compounds and crystallizes in the monoclinic system (space group P21). Two crystallographically independent dysprosium atoms are in eight-fold coordination, with a triangular dodecahedron geometry. Absorption, emission (77 and 300 K) and excitation spectra as well as fluorescence decay time measurements allowed optical characterization of obtained complex. Efficient energy transfer from SP– ligand to Dy3+ ion has been demonstrated. The Judd-Ofelt theory was applied to predict fundamental fluorescence properties of Dy3+ ion in the title chelate. The Judd-Ofelt intensity parameters were used to determine the emission transition probabilities, fluorescence branching ratios and radiative lifetime of the emitting 4F9/2 level. The obtained results indicate that the investigated chelate can be a potential candidate for OLEDs emitting yellow light.