Abstract
A new europium complex, Eu (acac)3Aphen (where Hacac and Aphen stand for acetylacetone and 5-acrylamido-1,10-phenanthroline, respectively), was synthesized and characterized by elemental analysis, IR, UV and photoluminescence (PL) spectra. The ligand Aphen not only serves as an antenna ligand but also offers a functional group for polymer precursor. The room-temperature PL spectra of the europium (III) complex are composed of the typical Eu3+ red emission, assigned to transitions between the first excited state (5D0) and the multiplet (7F04). Compared to Eu (acac)2AA (where HAA is acrylic acid), Eu (acac)3Aphen exhibits greatly enhanced quantum efficiency (i.e., 14.1% vs 28.5%) and longer 5D0 lifetime (260 μs vs 568 μs).
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