Document Detail


Challenge to the charging model of semiconductor-nanocrystal fluorescence intermittency from off-state quantum yields and multiexciton blinking.
MedLine Citation:
PMID:  20482016     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Semiconductor nanocrystals emit light intermittently; i.e., they "blink," under steady illumination. The dark periods have been widely assumed to be due to photoluminescence (PL) quenching by an Auger-like process involving a single additional charge present in the nanocrystal. Our results challenge this long-standing assumption. Close examination of exciton PL intensity time traces of single CdSe(CdZnS) core(shell) nanocrystals reveals that the dark state PL quantum yield can be 10 times less than the biexciton PL quantum yield. In addition, we observe spectrally resolved multiexciton emission and find that it also blinks with an on/off ratio greater than 10:1. These results directly contradict the predictions of the charging model.
Authors:
Jing Zhao; Gautham Nair; Brent R Fisher; Moungi G Bawendi
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2010-04-16
Journal Detail:
Title:  Physical review letters     Volume:  104     ISSN:  1079-7114     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2010 Apr 
Date Detail:
Created Date:  2010-05-20     Completed Date:  2010-08-11     Revised Date:  2012-09-20    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  157403     Citation Subset:  IM    
Affiliation:
Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
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MeSH Terms
Descriptor/Qualifier:
Nanoparticles / chemistry*
Semiconductors*
Spectrometry, Fluorescence
Time Factors
Grant Support
ID/Acronym/Agency:
P41 RR002594/RR/NCRR NIH HHS; P41 RR02594/RR/NCRR NIH HHS
Comments/Corrections

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