A Strong-Fluorescent Tb-Containing Hydrotalcite-Like Compound
A novel strong-fluorescent Tb-containing hydrotalcite-like compound (Tb-HTlc) was prepared using the coprecipitation method. The Tb-HTlc has a special layer structure, in which aluminum(III) was partially substituted by terbium(III) in the hydrotalcite-like layers; acetylacetone and 1,10-phenanthroline were dispersed into the anions among the interlayer region. Tb3+ ions in the layers were coordinated by the acetylacetone and 1,10-phenanthroline through the oxygen and nitrogen atoms. The sample was characterized by X-ray powder diffraction patterns, X-ray photoelectron spectroscopy, fourier transform infrared, thermogravimetry and differential scanning calorimeter (TG–DSC), transmission electron microscopy, and fluorescence spectra, and its properties and structure were determined. The results indicated that the sample exhibited a characteristic green light (545 nm). The fluorescent lifetime and fluorescence quantum yield of Tb-HTlc were measured to be, 1092.88 s and 54.07% respectively, higher than those of Tb(III)-acetylacetone-1,10-phenanthroline complex [Tb(acac)3phen]. The result of TG–DSC measurement clearly showed the enhanced thermal stability of Tb-HTlc compared with that of MgAl-LDH and Tb(acac)3phen. Possessing excellent photoluminescent property and thermal stability, low contents of rare earth ions and ligands, the Tb-HTlc may become one of the novel fluorescent materials with potential application in organic light-emitting diodes.
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Document Type: Research Article
Affiliations: The Institute of Polymer Science, College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, China
Publication date: August 1, 2010