期刊
DYES AND PIGMENTS
卷 132, 期 -, 页码 398-404出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2016.05.026
关键词
Europium (III) complex; Fluorinated beta-diketone; Heterocyclic nitrogen donors; Photoluminescence property; Quantum efficiency; Judd-Ofelt intensity parameters
资金
- National Natural Science Foundation of China [21542009]
- Educational Commission of Hubei Province, PR China [B2015132]
Two fluorinated beta-diketones and their six europium (III) complexes using 2,2-dipyridine, 1,10-phenanthroline or 4'-phenyl-terpyridine as the secondary ligand were synthesized and characterized. The photoluminescence behavior for these complexes was investigated in solid state in detail. Based on the emission spectra and luminescence decay curves of these complexes in solid state, the Judd-Ofelt intensity parameters (Omega(t)), lifetime (tau) and luminescence quantum efficiency (eta) were determined. The Omega(2) values indicate that the europium (III) ion is in a highly polarizable chemical environment in these complexes. Europium (III) complexes with the secondary ligands 2,2-dipyridine or 1,10-phenanthroline exhibited much better photoluminescence properties than complexes With the secondary ligand 4'-phenyl-terpyridine. Especially, europium (III) complexes of 4,4,4-trifluoro-1-(4-fluorophenyl)-butane-1,3-dione containing the secondary ligands 2,2-dipyridine or 1,10-phenanthroline showed a longer lifetime (tau = 0.799 and 0.826 ms, respectively) and a higher luminescence quantum efficiency (eta = 56.5 and 56.1, respectively) among these complexes. (C) 2016 Elsevier Ltd. All rights reserved.
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