A new EuIII β-diketonate complex [Eu(btfa)3(dmbpy)] containing the btfa (4,4,4-trifluoro-1-phenyl-1,3-butanedione) and the p,p′-disubstituted bipyridine ligand dmbpy (4,4′-dimethyl-2,2′-bipyridine) have been synthesized and fully characterized. The X-ray crystal structure reveals that the compound crystallize in monoclinic system of space group P21/n, with a classical structure observed in other similar compounds. The molecular structure of the EuIII complex was calculated using the Sparkle/PM6 model, and your optimized ground state geometry were used to calculated all details involved in the energy transfer process and compared with photoluminescence experimental data. These data shows that the triplet→5D1 and triplet→5D0 are the main energy transfer channels and that the photoluminescence mechanism in this complex is proposed to be a ligand sensitized luminescence process. Additionally, red organic light emitting diode (OLED) devices were fabricated using this complex, presenting the characteristic EL emission bands due to 5D0→7FJ (J=0–4) transitions, which gives evidence that the “antenna effect” is operative. Due to its intense red photo/electroluminescence emission, this complex have potential applications as light-conversion molecular devices (LCMDs), mainly to fabricate new OLEDs.