Syoji Ito et al 2007 J. Phys.: Condens. Matter 19 486208 doi:10.1088/0953-8984/19/48/486208
Syoji Ito1,2,4, Naoki Toitani1,2, Lingyun Pan3, Naoto Tamai3,4 and Hiroshi Miyasaka1,2,4
Show affiliationsWe have examined the relaxation dynamics of the dark state for water-soluble cadmium telluride (CdTe) nanocrystals by fluorescence correlation spectroscopy (FCS). Autocorrelation curves for CdTe nanocrystals were not reproduced by an analytical model including a single diffusion term and monophasic decay of dark-state contribution, but well reproduced by a model taking into account stretched-exponential type nonradiative relaxation. The present result suggests the presence of a widely distributed relaxation pathway of the dark state in the time region from μs to ms. Data analysis by the model including stretched-exponential type decay revealed that the timescale of nonradiative relaxation for CdTe nanocrystals decreased with the excitation laser power, suggesting the relaxation process of the dark state is promoted by additional absorption of a photon.
Soft matter, liquids and polymers
Issue 48 (5 December 2007)
Received 10 June 2007, in final form 17 October 2007
Published 9 November 2007
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