Synthesis and emission analysis of novel rare earth complex Eu(TTA) 3(2NH 2-Phen)

Abstract

The rare earth ternary complex of Eu 3+ with thenoyltrifluoroacetone, and 4, 7-2NH 2 phenanthroline was synthesized and well characterized by UV, fluorescent, IR spectrometry and X-ray diffractometry (XRD) as well as elemental analysis. The results show that the complex of Eu(III) emits strong red luminescence when excited by UV light, and Eu(TTA) 3(2NH 2-Phen) has the higher sensitized luminescent efficiency and longer lifetime than Eu(TTA) 3(Phen). In device of ITO/PVK/Eu(TTA) 3(2NH 2-Phen)/Al, the spectra of Eu(TTA) 3(2NH 2-Phen) with different ratios for spin-cast film were monitored. The main emitting peak at 614 nm can be attributed to the transition of 5D 0→ 7F 2 of Eu 3+ and this process results in the enhancement of red emission from electroluminescence device. The effect and mechanism of the ligands on the luminescence properties of europium complex were discussed. The results show that the luminescence intensity of the title complexes greatly increases in comparison with that of their corresponding complexes, revealing that the second ligands form very good synergistic effect with the first ligands. The title complexes possess excellent thermal stability properties, and are hopefully developed into fine PL and EL red materials.