Thermalization of exciton states in silicon nanocrystals

Julsgaard, Brian; Lu, Ying-Wei; Balling, Peter; Larsen, Arne Nylandsted
November 2009
Applied Physics Letters;11/2/2009, Vol. 95 Issue 18, p183107
Academic Journal
Silicon nanocrystals are studied by time-resolved fluorescence spectroscopy. After laser excitation the bright and dark exciton ground state levels are populated at random, but subsequently the decay curves reveal a thermalization between these levels. The characteristic thermalization time is found to be approximately 100 ns for temperatures below 100 K and surprisingly increases for higher temperatures. The decay curves are analyzed using a simple two-state model for the bright and dark exciton ground states.


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