Luminescent electrospun composite nanofibers of [Eu(TFI)3(Phen)]·CHCl3/polyvinylpyrrolidone

The luminescent europium complex Eu(TFI)₃(Phen)]·CHCl₃ (TFI = 2-(2,2,2-trifluoroethyl)-1-indone, Phen = 1,10-phenanthroline) was incorporated into poly(vinylpyrrolidone) (PVP) matrixes and electrospun into nanofibers. The effect of Eu(TFI)₃(Phen)]·CHCl₃ on the morphology and luminescence of composite nanofibers has been studied. FT-IR and TGA analyses of the composite nanofibers have been conducted and discussed. Further, the Judd–Ofelt theory is employed to study the effect of the dispersion of Eu(TFI)₃(Phen)]·CHCl₃ and the interactions between the Eu(TFI)₃(Phen)]·CHCl₃ molecules and neighboring chain segments of PVP. The results suggest that PVP led to the increased polarization degree of Eu³⁺ ions and significantly enhanced the electronic dipole-allowed transitions of Eu³⁺ ions, resulting in the enhancement of luminescent efficiency.