Preparation, spectral and Judd Ofelt analyses of luminous Octa-coordinated Europium (III) complexes.

[Display omitted] • Red emissive complexes with [Eu(TFFB) 3 L] stoichiometry were synthesized and investigated by spectroscopic studies. • Red emissive behavior of the complexes was characterized by photoluminescence study. • Photophysical characteristics of the mononuclear Eu(III) complexes were analyzed theoretically (JOES) and experimentally. • Probability amplitude distribution and the energy of HOMO and LUMO were estimated through DFT. Heteroleptic trivalent complexes of europium were prepared on reaction of EuCl 3 ·6H 2 O, fluorinated 1,3-diketone and 2,2′-bipyridine or its derivatives in the molar ratio of 1:3:1 respectively. Structural analysis of prepared complexes was done via spectral study. Luminescence features of synthesized complexes have been explored by the photoluminescence and decay spectral profile. Strong emission in the red spectral region was observed for Eu3+ ion corresponding to the electric dipole 5D 0 → 7F 2 hypersensitive transition. The radiative transition probabilities as well as the Judd-Ofelt parameters were computed and discussed. Complexes emit red light in the visible spectrum as illustrated by their CIE color coordinates are essential for creating effective display and lighting devices. [ABSTRACT FROM AUTHOR]