Jayatilleka, H;
Diamare, D;
Wojdak, M;
Kenyon, AJ;
Mokry, CR;
Simpson, PJ;
Knights, AP;
... Halsall, MP; + view all
(2011)
Probing energy transfer in an ensemble of silicon nanocrystals.
Journal of Applied Physics
, 110
(3)
, Article 033522. 10.1063/1.3622151.
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Abstract
Time-resolved photoluminescence measurements of silicon nanocrystals formed by ion implantation of silicon into silicon dioxide reveal multi-exponential luminescence decays. Three discrete time components are apparent in the rise and decay data, which we associate with different classes of nanocrystals. The values of decay time are remarkably constant with emission energy, but the relative contributions of the three components vary strongly across the luminescence band. In keeping with the quantum confinement model for luminescence, we assign emission at high energies to small nanocrystals and that at low energies to large nanocrystals. By deconvolving the decay data over the full emission band, it is possible to study the migration of excitation from smaller (luminescence donor) to larger (luminescence acceptor) nanocrystals. We propose a model of diffusion of excitation between neighboring nanocrystals, with long lifetime emission being from the largest nanocrystal in the local neighborhood. Our data also allow us to study the saturation of acceptor nanocrystals, effectively switching off excitation transfer, and Auger recombination in non-interacting nanocrystals. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3622151]
| Type: | Article |
|---|---|
| Title: | Probing energy transfer in an ensemble of silicon nanocrystals |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1063/1.3622151 |
| Publisher version: | http://dx.doi.org/10.1063/1.3622151 |
| Language: | English |
| Additional information: | Copyright 2011 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 Jayatilleka, H and Diamare, D and Wojdak, M and Kenyon, AJ and Mokry, CR and Simpson, PJ and Knights, AP and Crowe, I and Halsall, MP (2011) Probing energy transfer in an ensemble of silicon nanocrystals. Journal of Applied Physics, 110 (3), Article 033522 and may be found at http://link.aip.org/link/?jap/110/033522 |
| Keywords: | THIN-FILMS, VISIBLE PHOTOLUMINESCENCE, ELECTRONIC STATES, POROUS SILICON, LIGHT-EMISSION, RICH SILICA, LUMINESCENCE, ELECTROLUMINESCENCE, SI, OXYGEN |
| UCL classification: | UCL 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: | https://discovery.ucl.ac.uk/id/eprint/1324091 |
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