Abstract
Europium complexes attracted generous interest devoted to their red colored emission for illuminising the grounds of organic light-emitting diodes. In this series, five europium complexes (C1-C5) have been synthesized with Ethyl 4-(4-methoxyphenyl 2, 4-dioxobutanaote) (dioxoester) as primary ligand and neocuproine (neo), 2, 2′-bipyridyl (bipy), bathophenanthroline (batho) and 1, 10-phenanthroline (phen) as ancillary ligands. All these complexes are characterized by adopting various investigative techniques. They show europium-centered luminescence as a characteristic red colored emission peak at 618 nm due to (5D0-7F2) -transition. The luminescence lifetime and internal quantum efficiencies of complexes are predicted by using photophysical data and Judd-Ofelt analysis. The monoexponential behavior of the decay curve suggests the presence of a single chemical atmosphere in the inner coordination sphere of the europium ion. TG/DTG analysis reveals the thermal stability of complexes up to 245 °C. The CIE color coordinates, color purity and asymmetric ratio of complexes confirm the emission in the red region of the visible spectrum.
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