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Propriétés optiques de nanocristaux de CdSe/ZnS individuels à basse température

Louis Biadala 1
1 Nanophotonique
CPMOH - Centre de physique moléculaire optique et hertzienne
Abstract : CdSe nanocrystals are attractive for many applications such as nanoscale electronics, laser technology, and biological fluorescent labelling. A detailed understanding of the band-edge exciton fi…ne structure and the relaxations pathways between sub-levels are crucial for these applications. During this project we have studied the optical properties of single CdSe/ZnS nanocrystals at cryogenical temperature and under magnetic …eld. The dramatic photostability of the nanocrystals emission has allowed the optical study of the two lowest exciton states : the "dark" excitonic state and the "bright" excitonic state, lying few meV above. These studies have also enabled us to identify a charged excitonic state (negative trion) and to characterize its photophysical properties. Besides we have demonstrated that in these nanocrystals, radiative cascade biexciton-exciton might be generated.
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Louis Biadala. Propriétés optiques de nanocristaux de CdSe/ZnS individuels à basse température. Autre [cond-mat.other]. Université Sciences et Technologies - Bordeaux I, 2010. Français. ⟨tel-00654493⟩

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