High-efficiency erbium ion luminescence in silicon nanocrystal systems |
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Authors: | P K Kashkarov B V Kamenev M G Lisachenko O A Shalygina V Yu Timoshenk M Schmidt J Heitmann M Zacharias |
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Institution: | (1) Faculty of Physics, Moscow State University, Vorob’evy gory, Moscow, 119992, Russia;(2) Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, Halle, 06120, Germany |
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Abstract: | The photoluminescence spectra and kinetics of both erbium-doped and undoped multilayer structures of quasi-ordered silicon nanocrystals in a silicon dioxide matrix were studied. It was shown that the optical excitation energy of silicon nanocrystals 2–3 nm in size can be practically completely transferred to Er3+ ions in the oxide surrounding the nanocrystals, with its subsequent radiation at 1.5 µm. Possible reasons for the high excitation efficiency of the Er3+ ions are discussed, and the conclusion is drawn that the Förster mechanism is dominant in the energy transfer processes occurring in these structures. |
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