Spectrally resolved energy transfer from excitons in Si nanocrystals to Er ions

Kenji Imakita, Minoru Fujii, and Shinji Hayashi
Phys. Rev. B 71, 193301 – Published 10 May 2005

Abstract

The energy transfer from Si nanocrystals (Si-nc’s) to Er ions was studied spectroscopically. At low temperatures, inhomogeneously broadened photoluminescence bands of Si-nc’s were partially quenched and some dips were observed. A comparison of the quenched spectra with a photoluminescence excitation spectrum revealed that the dips are due to the resonant energy transfer from excitons in Si-nc’s to Er ions. For the energy transfer to the I1124 state of Er ions, two dips, one very clear and the other indistinctive, were observed, while to the I924 state, two dips with comparable depth were observed. Modification of the band structure of Si-nc’s by the quantum size effects is responsible for the different dip structures, depending on to which states the energy transfer is made.

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  • Received 8 November 2004

DOI:https://doi.org/10.1103/PhysRevB.71.193301

©2005 American Physical Society

Authors & Affiliations

Kenji Imakita, Minoru Fujii*, and Shinji Hayashi

  • Department of Electrical and Electronics Engineering, Faculty of Engineering, Kobe University, Rokkodai, Nada, Kobe 657-8501, Japan

  • *Author to whom correspondence should be addressed. Electronic address: fujii@eedept.kobe-u.ac.jp

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Issue

Vol. 71, Iss. 19 — 15 May 2005

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