Issue |
EPL
Volume 79, Number 3, August 2007
|
|
---|---|---|
Article Number | 37002 | |
Number of page(s) | 5 | |
Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
DOI | https://doi.org/10.1209/0295-5075/79/37002 | |
Published online | 16 July 2007 |
Temperature-induced crossover between bright and dark exciton emission in silicon nanoparticles
1
Experimental Physics and CeNIDE, University of Duisburg-Essen - Lotharstraße 1, D-47048 Duisburg, Germany
2
Combustion and Gas Dynamics, University of Duisburg-Essen - Lotharstraße 1, D-47048 Duisburg, Germany
Corresponding author: cedrik.meier@uni-due.de
Received:
8
March
2007
Accepted:
19
June
2007
The excitonic fine structure of silicon nanoparticles is investigated by time-resolved and magnetic-fielddependent photoluminescence. The results are analyzed using the common model of an excitonic fine structure consisting of a bright and a dark exciton. We find that the radiative recombination rates of both excitons differ only by a factor of eight. Therefore, we observe a thermal crossover in the character of the emission from bright-exciton-like to dark-exciton-like. The validity of our model is further supported by magnetic-fielddependent measurements, in which effects of state mixing are observed.
PACS: 78.67.Bf – Nanocrystals and nanoparticles / 78.55.-m – Photoluminescence, properties and materials / 71.35.-y – Excitons and related phenomena
© Europhysics Letters Association, 2007
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