Excitons Emissions and Raman Scattering of ZnO Nanoparticles Embedded in BaF2 Matrices by Reactive Magnetron Sputtering

Authors: Zang, C. H.; Su, J. F.; Liu, Y. C.; Tang, C. J.; Fang, S. J.; Zhang, D. M.; Zhang, Y. S.

Source: Journal of Nanoscience and Nanotechnology, Volume 11, Number 11, November 2011 , pp. 9823-9828(6)

Publisher: American Scientific Publishers

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Abstract:

ZnO nanoparticles embedded in BaF2 matrix were fabricated by rf magnetic sputtering technology. The optical properties of high quality ZnO nanoparticles, thermally post treated in a N2 atmosphere, were investigated by temperature-dependence photoluminescence measurement. Free exciton and localized exciton were observed at the low temperature. Free exciton peak was at 3.374 eV and localized exciton peak was at 3.420 eV, dominating the PL spectrum at 77 K. Free exciton transition was observed at 3.310 eV at room temperature, whereas the localized exciton transition was at 3.378 eV. The multiple-phonon Raman scattering spectrum showed that ZnO nanoparticles embedded in BaF2 matrix had a large deformation energy originated from lattice mismatch between ZnO and BaF2 matrix. Analysis of the fitting results from the temperature dependence of FWHM of ZnO exciton illustrated that the large value of γ ph was good qualitative agreement with the large deformation potential.

Keywords: LOCALIZED EXCITON; PHOTOLUMINESCENCE; ZNO NANOPARTICLES

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2011.5326

Publication date: November 1, 2011

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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