Abstract
The potential of Ge nanoparticles (NPs) embedded in with tunable effective optical bandgap values in the range of 1.0–3.3 eV to induce enhanced light emission is investigated. We demonstrate nonresonant indirect excitation of the ions mediated by the Ge NPs at room temperature. Efficient light emission enhancement is obtained for Ge NPs with large effective optical bandgaps in the range of 1.85 to 2.8 eV. The coupled Ge NP–Er emission shows a negligible thermal quenching from 10 K to room temperature that is related to de-excitation through thermally activated defect states.
© 2014 Optical Society of America
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