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Luminescence from erbium-doped silicon nanocrystals in silica: Excitation mechanisms

Kenyon, AJ; Chryssou, CE; Pitt, CW; Shimizu-Iwayama, T; Hole, DE; Sharma, N; Humphreys, CJ; (2002) Luminescence from erbium-doped silicon nanocrystals in silica: Excitation mechanisms. Journal of Applied Physics , 91 (1) 367 - 374. 10.1063/1.1419210. Green open access

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Abstract

We develop a model for the excitation of erbium ions in erbium-doped silicon nanocrystals via coupling from confined excitons generated within the silicon nanoclusters. The model provides a phenomenological picture of the exchange mechanism and allows us to evaluate an effective absorption cross section for erbium of up to 7.3x10(-17) cm(2): four orders of magnitude higher than in stoichiometric silica. We address the origin of the 1.6 eV emission band associated with the silicon nanoclusters and determine absorption cross sections and excitonic lifetimes for nanoclusters in silica which are of the order of 1.02x10(-16) cm(2) and 20-100 mus, respectively. (C) 2002 American Institute of Physics.

Type: Article
Title: Luminescence from erbium-doped silicon nanocrystals in silica: Excitation mechanisms
Open access status: An open access version is available from UCL Discovery
DOI: 10.1063/1.1419210
Publisher version: http://dx.doi.org/10.1063/1.1419210
Language: English
Additional information: Copyright 2002 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Kenyon, AJ and Chryssou, CE and Pitt, CW and Shimizu-Iwayama, T and Hole, DE and Sharma, N and Humphreys, CJ (2002) Luminescence from erbium-doped silicon nanocrystals in silica: Excitation mechanisms. Journal of Applied Physics, 91 (1) 367 - 374 and may be found at http://link.aip.org/link/?jap/91/00367
Keywords: SI NANOCRYSTALS, RICH SILICA, THIN-FILMS, OPTICAL-PROPERTIES, ENERGY-TRANSFER, VISIBLE PHOTOLUMINESCENCE, POROUS SILICON, ER3+, ELECTROLUMINESCENCE, SIO2-FILMS
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: http://discovery.ucl.ac.uk/id/eprint/149703
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