Photoluminescence properties of Eu~(3+)-doped MgAl_2O_4 nanoparticles in various surrounding media |
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| Authors: | I.E. Kolesnikov E.V. Golyeva E.V. Borisov E. Yu Kolesnikov E. Lähderanta A.V. Kurochkin M.D. Mikhailov |
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| Affiliation: | 1. St. Petersburg State University, St. Petersburg, Russia;2. Lappeenranta University of Technology LUT, Lappeenranta, Finland;3. Peter the Great St. Petersburg Polytechnic University, St. Petersburg, Russia;4. Scientific and Technological Institute of Optical Material Science, VNTs S.I. Vavilov State Optical Institute, St. Petersburg, Russia;5. Volga State University of Technology, Yoshkar-Ola, Russia |
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| Abstract: | Eu~(3+)-doped MgAl_2O_4 nanoparticles were prepared by modified Pechini method.X-ray diffraction analysis shows pure tetragonal spinel phase without any impurities.The average size of synthesized nanoparticles was determined to be about 50-60 nm using scanning electron microscopy and static light scattering techniques.Emission and excitation spectra as well as lifetimes of MgAl_2O_4:Eu~(3+) nanophosphors were explored in surrounding media with different refractive indexes.Surrounding medium does not affect luminescence bands position,whereas ~5D_0 lifetime monotonically decreases along with increase of medium refractive index.Effect of surrounding media on radiative and nonradiative decay rates,which were calculated using 4f-4f intensity theory,was studied and discussed.Filling factor of prepared nanoparticles is defined using both radiative and observed lifetimes. |
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| Keywords: | Corresponding author. St. Petersburg State University, St. Petersburg, Russia. Nanoparticles Filling factor Luminescence Lifetime Rare earths |
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