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Two new europium complexes, Eu(NTA) 3 (bath) and Eu(NTA) 3 (DPEPO), were synthesized and characterized by elemental analysis, Fourier transform infrared, mass spectrometry, thermogravimetric analysis and photoluminescence spectroscopy. The room-temperature photoluminescence spectra of the Eu 3+  complexes are composed of the typical Eu 3+  red emission, assigned to transitions between the first excited state ( 5 Δ 0 ) and the multiplet ( 7 F 0-4 ). The results demonstrate that the substitution of water molecules by bidentate oxygen or nitrogen ligands in Eu(NTA) 3 (H 2 O) 2  richly enhances the overall quantum yield ( Φ  overall  = 12% vs. 87%) and life time values ( τ  obs  = 339 vs. 521 μs).

Efficient photoluminescence from 1-(2-Naphthoyl)-3,3,3-trifluroacetonate complex of Eu 3+ with bidentate neutral donors