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Coupling and Cooperative Up-conversion Coefficients in Er-doped Si Nanocrystals

Published online by Cambridge University Press:  10 February 2011

Domenico Pacifici
Affiliation:
INFM and Dipartimento di Fisica e Astronomia, Via Santa Sofia 64, I-95123 Catania, Italy
Giorgia Franzò
Affiliation:
INFM and Dipartimento di Fisica e Astronomia, Via Santa Sofia 64, I-95123 Catania, Italy
Fabio Iacona
Affiliation:
INFM and Dipartimento di Fisica e Astronomia, Via Santa Sofia 64, I-95123 Catania, Italy
Francesco Priolo
Affiliation:
INFM and Dipartimento di Fisica e Astronomia, Via Santa Sofia 64, I-95123 Catania, Italy
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Abstract

In the present work, a quantitative understanding of the Er-doped Si nanocrystals interaction is reported. We present a model based on an energy level scheme taking into account the coupling between each Si nanocrystal and the neighboring Er ions. By fitting the steady state and time resolved luminescence signals at both the 1.54 and 0.98 μm Er lines we were able to determine a value of 3×10-15 cm3 s-1 for the coupling coefficient. Moreover, a strong cooperative up-conversion mechanism, active between two excited Er ions and characterized by a coefficient of 7×10-17 cm3 s-1, will be shown to be active in the system, demonstrating that each Si nanocrystal can actually excite more than one Er ion.

Type
Research Article
Copyright
Copyright © Materials Research Society 2003

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References

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