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Rate equation modelling of erbium luminescence dynamics in erbium-doped silicon-rich-silicon-oxide

Shah, M; Wojdak, M; Kenyon, AJ; Halsall, MP; Li, H; Crowe, IF; (2012) Rate equation modelling of erbium luminescence dynamics in erbium-doped silicon-rich-silicon-oxide. Journal of Luminescence , 132 (12) 3103 - 3112. 10.1016/j.jlumin.2012.02.002. Green and gold open access

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Abstract

Erbium doped silicon-rich silica offers broad band and very efficient excitation of erbium photoluminescence (PL) due to a sensitization effect attributed to silicon nanocrystals (Si-nc), which grow during thermal treatment. PL decay lifetime measurements of sensitised Er3+ ions are usually reported to be stretched or multi exponential, very different to those that are directly excited, which usually show a single exponential decay component. In this paper, we report on SiO2 thin films doped with Si-nc's and erbium. Time resolved PL measurements reveal two distinct 1.54 μm Er decay components; a fast microsecond component, and a relatively long lifetime component (10 ms). We also study the structural properties of these samples through TEM measurements, and reveal the formation of Er clusters. We propose that these Er clusters are responsible for the fast μs decay component, and we develop rate equation models that reproduce the experimental transient observations, and can explain some of the reported transient behaviour in previously published literature.

Type:Article
Title:Rate equation modelling of erbium luminescence dynamics in erbium-doped silicon-rich-silicon-oxide
Open access status:An open access publication. A version is also available from UCL Discovery.
DOI:10.1016/j.jlumin.2012.02.002
Publisher version:http://dx.doi.org/10.1016/j.jlumin.2012.02.002
Language:English
Additional information:This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Electronic and Electrical Engineering

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