Size-controlled Ge nanostructures for enhanced Er3+ light emission

作者：Martin Sanchez Javier^*; Serna Rosalia; Toudert J; Alen Benito; Ballesteros Carmen

来源：Optics Letters, 2014, 39(16): 4691-4694.

DOI：10.1364/OL.39.004691

The potential of Ge nanoparticles (NPs) embedded in Al2O3 with tunable effective optical bandgap values in the range of 1.0-3.3 eV to induce enhanced Er3+ light emission is investigated. We demonstrate nonresonant indirect excitation of the Er3+ ions mediated by the Ge NPs at room temperature. Efficient Er3+ 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 Er3+ de-excitation through thermally activated defect states.

• 出版日期2014-8-15