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  • 2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference
  • (Optica Publishing Group, 2015),
  • paper EG_7_5

Time-coherence properties of the trion fluorescence in thick-shell CdSe/CdS nanocrystals by Photon-Correlation Fourier Spectroscopy

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Abstract

The synthesis of a crystalline CdS thick shell on a CdSe core represented a crucial improvement for semiconductor nanocrystals (NCs). In comparison to standard CdSe/ZnS NCs, blinking of the fluorescence is greatly reduced at room temperature and completely suppressed at 4K for a time scale ranging from 50 ns to 100 ms. At 4K, it was demonstrated that these NCs are always negatively charged. Auger recombination of the negative trion is also inhibited resulting in a nearly unitary quantum yield. At least, the three careers are confined in the core of the NC and far away from the NC surface [1]. The trion then appears as a perfect and stable emitting state, well isolated from the close NC environment.

© 2015 IEEE

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