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Journal of Spectroscopy
Volume 2015, Article ID 541958, 12 pages
Research Article

SrAl2O4:Eu2+(,Dy3+) Nanosized Particles: Synthesis and Interpretation of Temperature-Dependent Optical Properties

1Inorganic Chemistry, Department of Science and Engineering, University of Siegen, Adolf-Reichwein Street 2, 57068 Siegen, Germany
2Institute of Physics, Azerbaijan National Academy of Sciences, G. Javid Avenue 33, 1143 Baku, Azerbaijan
3Institute of Applied Physics, Academy Sciences of Moldova, Academiei Street 5, 2028 Chisinau, Moldova

Received 9 November 2014; Accepted 17 January 2015

Academic Editor: Masaki Oura

Copyright © 2015 Huayna Terraschke et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


SrAl2O4 nanosized particles (NPs) undoped as well as doped with Eu2+ and Dy3+ were prepared by combustion synthesis for the discussion of their intensively debated spectroscopic properties. Emission spectra of SrAl2O4:Eu2+(,Dy3+) NPs are composed by a green band at 19 230 cm−1 (520 nm) at room temperature, assigned to anomalous luminescence originated by Eu2+ in this host lattice. At low temperatures, a blue emission band at 22 520 cm−1 (444 nm) is observed. Contrary to most of the interpretations provided in the literature, we assign this blue emission band very reliably to a normal 4f6(7FJ)5d(t2g)→4f7(8S7/2) transition of Eu2+ substituting the Sr2+ sites. This can be justified by the presence of a fine structure in the excitation spectra due to the different 7FJ levels () of the 4f6 core. Moreover, Fano antiresonances with the 6IJ () levels could be observed. In addition, the Stokes shifts ( 980 cm−1 and 5 270 cm−1 for the blue and green emission, resp.), the Huang-Rhys parameters of and 6, and the average phonon energies of and 470 cm−1 coupled with the electronic states could be reliably determined.