کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
72189 49013 2016 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Luminescence properties of lanthanide-containing layered double hydroxides
ترجمه فارسی عنوان
خواص لومینسانس هیدروکسید دو لایه حاوی لانتانید
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
چکیده انگلیسی


• Lanthanide cations can be incorporated in a Mg, Al hydrotalcite without distortion.
• Lanthanide cations are well dispersed in the mixed oxides formed upon calcination.
• The Tb containing samples show a green fluorescence.
• Formation of Tb4+ species decreases the luminescence intensity.

A series of layered double hydroxides with the hydrotalcite structure containing Mg2+ and Al3+ cations in the brucite-like layers and carbonate in the interlayer have been prepared, with different lanthanide cations (4% loading) in the brucite-like layers. The solids have been characterized by element chemical analysis, powder X-ray diffraction, thermal analysis, particle size distribution, FT-IR and UV–Vis spectroscopies and surface texture by adsorption–desorption of nitrogen at – 196 °C. The color and luminescent properties have been also studied. The results confirmed the hydrotalcite-type structure, without any sort of contaminating phases. The solids have been calcined at 1000 °C forming homogeneously dispersed mixed oxides, where the rock-salt structure of MgO and the MgAl2O4 spinel have been identified by powder X-ray diffraction, without any differentiated phase containing lanthanide ions. The samples (original and calcined) containing Tb3+ exhibited green fluorescence, detected under irradiation of 254 and 365 nm. The emission spectra showed a series of narrow lines ascribed to the Tb3+5D4→7F6−2 transitions. The decay curves monitored at 543 nm indicated the presence of a single local Tb3+ environment in the parent and calcined samples. For the calcined samples, the photoluminescence evidence supports the insertion of Tb3+ in MgAl2O4 rather than in MgO.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Microporous and Mesoporous Materials - Volume 226, 15 May 2016, Pages 209–220
نویسندگان
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