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Proceedings Paper

Excitation of Er ions by the energy transfer from Si nanocrystals
Author(s): Minoru Fujii; Kei Watanabe; Shinji Hayashi
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Paper Abstract

Incorporation of Si nanocrystal into Er-doped glasses strongly enhances the IR luminescence of Er3+. The enhancement is believed to be due to the energy transfer from nc-Si. However, the mechanism of the interaction between nc-Si and Er3+ has not been fully understood. In this work, we have studied the interaction between nc-Si and Er3+ by photoluminescence (PL) spectroscopy and PL decay dynamics. In order to tune the luminescence energy of nc-Si to the energy separations between the discrete electronic sates of Er3+, the size of nc-Si was changed in a wide range; the PL energy of nc-Si was changed from 1.2 to 1.5 eV. At low temperatures, periodic features were observed in the PL spectra of nc-Si. The observation of the features is the first spectroscopic evidence that indicates the strong coupling between nc-Si and Er3+. Furthermore, size dependence of the energy transfer rate was estimated from the delay time of the Er3+. The effects of quantum confinement of excitons in nc-Si on the high PL efficiency of Er3+ are discussed.

Paper Details

Date Published: 27 April 2001
PDF: 15 pages
Proc. SPIE 4282, Rare-Earth-Doped Materials and Devices V, (27 April 2001); doi: 10.1117/12.424771
Show Author Affiliations
Minoru Fujii, Kobe Univ. (Japan)
Kei Watanabe, Kobe Univ. (Japan)
Shinji Hayashi, Kobe Univ. (Japan)

Published in SPIE Proceedings Vol. 4282:
Rare-Earth-Doped Materials and Devices V
Shibin Jiang, Editor(s)

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