Volume 79, Number 3, August 2007
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||16 July 2007|
Temperature-induced crossover between bright and dark exciton emission in silicon nanoparticles
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: email@example.com
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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