Thermo-sensitive luminescent materials composed of Tb(III) and Eu(III) complexes

Abstract

Thermo-stable lanthanide coordination polymers [Tb,Eu(hfa)3(dpbp)]n composed of Tb(III) ion, Eu(III) ion, bidentate phosphine oxide (dpbp: 4,4’-bis(diphenylphosphoryl)biphenyl), and low-vibrational frequency hexafluoroacetylacetonate (hfa) ligand are reported. The lanthanide coordination polymers [Tb,Eu(hfa)3(dpbp)]n (Tb/Eu=1, 10, 250, 500, and 750) are characterized by XRD, emission spectra and emission lifetime measurements. The energy transfer efficiencies among lanthanide ions are estimated using the emission lifetimes of solid-state coordination polymers. Characteristic emission properties of lanthanide coordination polymers composed of Tb(III) ions and a small amount of Eu(III) ions (Tb/Eu=750) have been observed for the first time. The energy transfer between lanthanide ions in coordination polymers is described in terms of solid-state materials.