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http://hdl.handle.net/10773/20419
Title: | Influence of the Crystal Structure on the Luminescence Properties of Mixed Eu,La-(1,10-Phenanthroline) Complexes |
Author: | Yang, Ting-Hai Fu, Lianshe Ferreira, Rute A. S. Nolasco, Mariela M. Rocha, Joao Carlos, Luis D. Shi, Fa-Nian |
Keywords: | METAL-ORGANIC FRAMEWORK EMISSION QUANTUM YIELD RARE-EARTH IONS INTRAMOLECULAR ENERGY-TRANSFER LANTHANIDE COMPLEXES PHOTOLUMINESCENCE PROPERTIES COORDINATION-COMPOUNDS DIFFERENTIAL-OVERLAP INTERMEDIATE NEGLECT THEORETICAL APPROACH |
Issue Date: | 2015 |
Publisher: | WILEY-V C H VERLAG GMBH |
Abstract: | A series of europium Eu- and La-doped complexes with two different crystal structures, namely, EuxLa1-x(phen)(2)(NO3)(3) [phen = 1,10-phenanthroline, x = 1.0 (1), 0.88 (2), 0.73 (3), and 0.52 (4)] and {[EuxLa1-x(phen)(2)(H2O)(2)(NO3)(2)](NO3)2(phen)(H2O)} [x = 0.28 (5) and 0.0 (6)], were synthesized in aqueous solution by using different Eu/La ratios.The complexes were characterized by single-crystal and powder X-ray diffraction, Fourier transform infrared spectroscopy, elemental analysis, thermogravimetry, and scanning electron microscopy. Compounds 1-4 and 5, 6 were obtained for Eu/La molar ratios higher than 5:5 and smaller than 3:7, respectively. The photoluminescence properties of these compounds depend on the crystal structure, which is determined by the Eu/La reactant ratio. Complexes 1-4 exhibit a quantum efficiency ( = 55%) and quantum yield (q = 31%) higher than 5 ( = 23% and q = 6%). The photophysical properties assessed by using the LUMPAC software are in good accord with the experimental values, particularly, the calculated (26%) and measured emission quantum yields (31%; excitation at the ligands at 255 nm). |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/20419 |
DOI: | 10.1002/ejic.201500611 |
ISSN: | 1434-1948 |
Publisher Version: | 10.1002/ejic.201500611 |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Influence of the Crystal Structure on the Luminescence Properties of Mixed EuLa-(110-Phenanthroline) Complexes_10.1002ejic.201500611.pdf | 3.54 MB | Adobe PDF |
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