کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5398797 | 1505893 | 2015 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Photoluminescent and structural properties of ZnO containing Eu3+ using PEG as precursor
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
ZnO powders containing different concentrations of Eu3+ synthetized using polyethylenoglycol (PEG) as precursor are reported. The viscous solutions were obtained and heated-treated at different temperatures to obtain materials in powder form in order to analyze the influence of temperature on photoluminescent and structural properties. The synthesis proposed in this paper enable the fabrication of the zinc oxide material containing Eu3+ with high relative concentrations. TG and DTA analyses allowed the behavior of the decomposition of precursors used in the synthesis to be observed. PEG used as precursor proved to be a very interesting molecule, producing materials with good photoluminescent properties. The structural characteristics of the material were evaluated by X-ray diffraction, followed by a Rietveld refinement. The results obtained show that is possible to incorporate Eu3+ in a ZnO host matrix with relatively high concentrations. The cell parameters showed minimal distortion and were independent of Eu3+ concentration. From calculation of the band gap, the difference of energy between HOMO and LUMO of 3.28Â eV was determined which is in accordance with the literature. The presence of Eu3+ makes the material a red emitter and the color of emission is dependent on wavelength of excitation (294 or 463Â nm). The excitation at 294Â nm promotes the photoluminescence emission in the visible region with large band assigned to the defects present in the ZnO host matrix. However when the material is excited at 463Â nm (exactly on Eu3+ energy level) bands with intense emission around 612Â nm are observed and assigned to the hypersensitive intraconfigurational transition of Eu3+ and the large band below that wavelength it is observed. The presence of a large band emission when the samples are excited at 463Â nm is an indication of the energy transfer from Eu3+ to the ZnO host matrix. The results obtained demonstrate that with this synthesis, the structural and photoluminescent properties of the product make it a potential candidate for applications in solar cells.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 167, November 2015, Pages 197-203
Journal: Journal of Luminescence - Volume 167, November 2015, Pages 197-203
نویسندگان
PatrÃcia M. dos Reis, Adriana S. de Oliveira, Edison Pecoraro, Sidney J.L. Ribeiro, Marcio S. Góes, Clebio S. Nascimento, Rogéria R. Gonçalves, Daniela P. dos Santos, Marco A. Schiavon, Jefferson L. Ferrari,