Dun-jia Wang, Yanying Pi, Chunyang Zheng
Oct 15, 2013
Citations
0
Influential Citations
30
Citations
Journal
Journal of Alloys and Compounds
Abstract
Abstract Preparation and photoluminescence behavior of four new europium (III) ternary complexes with β-diketones (1-(6-methoxy-naphthalen-2-yl)-3-phenyl-propane-1,3-dione (MNPPD) and 1-(4-tert-butyl-phenyl)-3-(6-methoxy-naphthalen-2-yl)-propane-1,3-dione (BPMPD)) and 2,2-dipyridine (Bipy) or 1,10-phenanthroline (Phen) were reported, in the solid state. Complexes Eu(MPPD) 3 ·Bipy, Eu(BMPD) 3 ·Bipy, Eu(MPPD) 3 ·Phen and Eu(BMPD) 3 ·Phen were characterized by elemental analysis, FT-IR, 1 H NMR, UV–vis absorption. The emission spectra show narrow emission bands that arise from the 5 D 0 → 7 F J ( J = 0–4) transitions of the europium ion. Based on the emission spectra and luminescence decay curves in solid state, the intensity parameters ( Ω t ), lifetime ( τ ) and emission quantum efficiency ( η ) were determined. The Ω 2 values indicate that the Eu(III) ion in these complexes is in a highly polarizable chemical environment. Complexes Eu(MPPD) 3 ·Bipy and Eu(MPPD) 3 ·Phen showed a longer lifetime ( τ ) and a higher luminescence quantum efficiency ( η ), which indicated that the energy transfer to the europium ion from MNPPD ligand is more efficient than that from BPMPD ligand.