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© Research
Publication : Physical review letters

Bright and grey states in CdSe-CdS nanocrystals exhibiting strongly reduced blinking

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Physical review letters - 30 Mar 2009

Spinicelli P, Buil S, Quélin X, Mahler B, Dubertret B, Hermier JP

Link to Pubmed [PMID] – 19392384

Phys. Rev. Lett. 2009 Apr;102(13):136801

When compared to standard colloidal nanocrystals, individual CdSe-CdS core-shell nanocrystals with thick shells exhibit strongly reduced blinking. Analyzing the photon statistics and lifetime of the on state, we first demonstrate that bright periods correspond to single photon emission with a fluorescence quantum efficiency of the monoexcitonic state greater than 95%. We also show that low intensity emitting periods are not dark but correspond to a grey state, with a fluorescence quantum efficiency of 19%. From these measurements, we deduce the radiative lifetime (45 ns) and the Auger lifetime (10.5 ns) of the grey state.

http://www.ncbi.nlm.nih.gov/pubmed/19392384