Space-separated quantum cutting in differently prepared solid-state dispersions of Si nanocrystals and Er<sup>3+</sup> ions in SiO<inf>2</inf>

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Journal Article
Materials Science and Engineering B: Solid-State Materials for Advanced Technology, 2009, 159-160 (C), pp. 87 - 89
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We investigate the efficiency of Si nanocrystal-mediated photoluminescence of Er3+ ions in SiO2 as a function of quantum energy of incoming photons. We demonstrate that for identical nanocrystals the threshold energy of the recently reported space-separated quantum cutting effect does not change with the nanocrystal-to-Er distance. In contrast, the enhancement of excitation efficiency observed above the threshold, in the high-energy photon regime, diminishes at larger separations, thus exhibiting a clear nanocrystal-to-Er distance dependence. © 2009 Elsevier B.V. All rights reserved.
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