Please use this identifier to cite or link to this item:
https://hdl.handle.net/2445/15724
Title: | Energy transfer mechanism and Auger effect in Er3+ coupled silicon nanoparticle samples |
Author: | Pitanti, Alessandro Navarro Urrios, Daniel Prtljaga, Nikola Daldosso, Nicola Gourbilleau, Fabrice Rizk, Richard Garrido Fernández, Blas Pavesi, Lorenzo |
Keywords: | Semiconductors Nanopartícules Semiconductors Nanoparticles |
Issue Date: | 13-Sep-2010 |
Publisher: | American Institute of Physics |
Abstract: | We report a spectroscopic study about the energy transfer mechanism among silicon nanoparticles (Si-np), both amorphous and crystalline, and Er ions in a silicon dioxide matrix. From infrared spectroscopic analysis, we have determined that the physics of the transfer mechanism does not depend on the Si-np nature, finding a fast (< 200 ns) energy transfer in both cases, while the amorphous nanoclusters reveal a larger transfer efficiency than the nanocrystals. Moreover, the detailed spectroscopic results in the visible range here reported are essential to understand the physics behind the sensitization effect, whose knowledge assumes a crucial role to enhance the transfer rate and possibly employing the material in optical amplifier devices. Joining the experimental data, performed with pulsed and continuous-wave excitation, we develop a model in which the internal intraband recombination within Si-np is competitive with the transfer process via an Auger electron"recycling" effect. Posing a different light on some detrimental mechanism such as Auger processes, our findings clearly recast the role of Si-np in the sensitization scheme, where they are able to excite very efficiently ions in close proximity to their surface. (C) 2010 American Institute of Physics. |
Note: | Reproducció del document publicat a: http://dx.doi.org/10.1063/1.3476286 |
It is part of: | Journal of Applied Physics, 2010, vol. 108, núm. 5, p. 53518-1-53518-8 |
URI: | https://hdl.handle.net/2445/15724 |
Related resource: | http://dx.doi.org/10.1063/1.3476286 |
ISSN: | 1089-7550 |
Appears in Collections: | Articles publicats en revistes (Enginyeria Electrònica i Biomèdica) Publicacions de projectes de recerca finançats per la UE |
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