Luminescence in Colorless, Transparent, Thermally Stable Thin Films of Eu3+ and Tb3+ ¦Â-diketonates in Hybrid Inorganic¨COrganic Zinc-based Sol¨CGel Matrix
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- 作者：Renata Figueredo Martins ; Rodrigo Ferreira Silva ; Rog¨¦ria Rocha Gon?alves and Osvaldo Antonio Serra
- 关键词：Luminescence films ; Sol– ; gel process ; β ; diketonates ; Antenna effect ; Thermal stability
- 刊名：Journal of Fluorescence
- 出版年：2010
- 出版时间：May, 2010
- 年：2010
- 卷：20
- 期：3
- 页码：739-743
- 全文大小：172.3 KB
文摘
Luminescent zinc-based hybrid inorganic–organic films with rare--earth (RE) complexes have been prepared using a non-alkoxide sol–gel process. The films were fabricated by the dip-coating method starting from zinc acetate dihydrate, rare earth chloride, lactic acid as hydrolytic catalyst, and anhydrous ethanol. The β-diketones thenoylltrifluoroacetone (Httfa) and dibenzoylmethane (Hdbm) were used as ligands to Eu3+ and Tb3+, respectively. After deposition of the first layer, the films were fired at temperatures between 50 and 300 ¡ãC, in air. Photophysical properties such as excitation, emission and emission, lifetimes were determined for the films obtained in different conditions. Eu3+/ttfa and Tb3+/dbm films fired at 300 and 250 ¡ãC, respectively, are still transparent and gave rise to intense emission when excited through the ligand (antenna effect).