Rare earth (Eu{sup 3+}, Tb{sup 3+}) centered composite gels Si-O-M (M = B, Ti) through hexafluoroacetyl-acetone building block: Sol-gel preparation, characterization and photoluminescence
- Department of Chemistry, Tongji University, Shanghai 200092 (China)
Highlights: Black-Right-Pointing-Pointer Composite gel of Si-O-M (M = B, Ti). Black-Right-Pointing-Pointer Hybrids with Si-O-B possess favorable luminescence property. Black-Right-Pointing-Pointer Sol-gel process of different alkoxides. -- Abstract: This report focuses on the syntheses of a series of novel photoactive composite xerogels materials in which the functionalized hexafluoroacetylacetone (HFAASi) organic components are grafted into the different inorganic networks (SiO{sub 2}-B{sub 2}O{sub 3} or SiO{sub 2}-TiO{sub 2}) via covalent bonds through a sol-gel process. Subsequently, the physical characterization and especially photoluminescent properties of the resulting xerogel materials are studied in detail. Except for composite xerogels linked to SiO{sub 2}-TiO{sub 2} networks, all of these composite xerogels exhibit homogeneous microstructures and morphologies, suggesting that molecular-based materials are obtained with strong covalent bonds between the organic {beta}-diketone ligand and inorganic matrices. In addition, the ternary rare earth composite gels present stronger luminescent intensities, longer lifetimes, and higher luminescent quantum efficiencies than the binary ones, indicating that the introduction of the second ligands (phen) can sensitize the luminescent emission of the rare earth ions in the ternary hybrid systems. It should be especially noted that these composite xerogels based on Si-O-B networks possess not only higher thermal stability but also stronger luminescent intensities than the other systems linked to different inorganic networks.
- OSTI ID:
- 22212372
- Journal Information:
- Materials Research Bulletin, Vol. 46, Issue 12; Other Information: Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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