Excitation of Er ions by the energy transfer from Si nanocrystals

Minoru Fujii; Kei Watanabe; Shinji Hayashi

doi:10.1117/12.424771

27 April 2001 Excitation of Er ions by the energy transfer from Si nanocrystals

Minoru Fujii, Kei Watanabe, Shinji Hayashi

Proceedings Volume 4282, Rare-Earth-Doped Materials and Devices V; (2001) https://doi.org/10.1117/12.424771
Event: Symposium on Integrated Optics, 2001, San Jose, CA, United States

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.

Citation Download Citation

Minoru Fujii, Kei Watanabe, and Shinji Hayashi "Excitation of Er ions by the energy transfer from Si nanocrystals", Proc. SPIE 4282, Rare-Earth-Doped Materials and Devices V, (27 April 2001); https://doi.org/10.1117/12.424771

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