resumo
A novel sol-gel derived hybrid material (classed as Eu-DBM-Si) covalently grafted with Eu(DBM-OH)(3).2H(2)O (where DBM-OH=o-hydroxydibenzoylmethane) was prepared through the primary beta-diketone ligand DBM-OH. All the synthesized ligands were characterized by (1)H NMR, elemental analyses and Fourier transform infrared spectra (FTIR). The resultant Eu-DBM-Si material exhibited good transparent and homogenous property. Compared to the Eu-DBM hybrid prepared by physically doped silicon dioxide with Eu(DBM-OH)V(2)H(2)O, the Eu-DBM-Si hybrid presented more efficient ligand-to-Eu(3+) energy transfer and a significant improvement in the measured emission quantum yield. Furthermore, the photophysical properties of these hybrid materials, such as the photoluminescence (PL) spectra, PL intensities, symmetry properties. lifetime decays, and Judd-Ofelt parameters were also investigated in detail. (C) 2008 Elsevier B.V. All rights reserved.
palavras-chave
INTRAMOLECULAR ENERGY TRANSFER; LUMINESCENT LANTHANIDE COMPLEXES; NEAR-INFRARED LUMINESCENCE; BETA-DIKETONATE COMPLEX; RARE-EARTH IONS; SPECTROSCOPIC PROPERTIES; 4F-4F TRANSITIONS; EMISSION-SPECTRA; LIQUID-CRYSTALS; EU3+ ION
categoria
Chemistry
autores
Guo, XM; Guo, HD; Fu, LS; Zhang, HJ; Carlos, LD; Deng, RP; Yu, JB
nossos autores
Lianshe Fu
Investigador Auxiliar
Luís Carlos
Professor Catedráticoagradecimentos
This work is financially supported by the National Natural Science Foundation of China (grant nos. 20490210, 206301040, 20602035 and 20771099) and the MOST of China (grant no. 2006CB601103). L.S.F. thanks Fundacao para a Ciencia e Tecnologia (Portuguese agency) for post-doctoral grant (SFRH/BPD/5657/2001).