<p>This research investigation reports the synthesis of europium complexes with chosen β-diketone referred as BPTD (1-(4-bromophenyl)-4,4,4-trifluorobutane-1,3-dione) and ancillary ligands (–N donors) as 2,2′-bipyridine (Bpy), 1,10-Phenanthroline (Phen), 2,9-dimethyl-1,10-phenanthroline (DmPhen) and 2,9-dibromo-1,10-phenanthroline (DbPhen). Elemental, FTIR, UV, Photoluminescence spectroscopy and TGA analysis are utilized to characterize the complexes. IR and NMR are employed to determine structure information about complexes. The optical bandgap measurements in DCM show the optically active wide-bandgap behavior of complexes. The luminescence intensity of the Europium centered luminescence clearly shows the good efficiency of energy transfer. Calculations using density functional theory demonstrated that the luminescence of Eu(III) complexes originates from the attenuation effect of β-diketonates that rigidifies the coordination surroundings about europium ion and reduces non-radiative energy loss suggesting that optical excitation populates ligand centered singlet and triplet states instead of metal centered states. The intensity of the f–f transitions in the wavelength spectrum of absorption was examined using the Judd–Ofelt hypothesis. Sets of phenomenological Ω_λ intensity values can be obtained.</p>