Luminescent Lanthanide-Mixed Coordination Polymers for Tunable Temperature-Sensitivity
The control of energy transfer efficiency in lanthanide [Ln(III)]-mixed coordination polymers is reported. The coordination polymers [Tb,Eu(hfa)3(dpbp)] n are composed of Tb(III) ions, Eu(III) ions, hfa ligands, and bidentate phosphine oxide ligands [dpbp: 4,4′-bis(diphenylphosphoryl)biphenyl]. The emission colors were controlled by varying the mixture ratio of Tb(III) and Eu(III) ions (Tb/Eu = 1–1000). The obtained compounds were characterized by XRD, emission spectra, and emission lifetime measurements. Temperature-dependent emission color change from green, yellow, orange, to red was observed, and spectroscopic features were discussed on the basis of energy transfer efficiency in the solid state.