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    
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.
Jing Zhao; Gautham Nair; Brent R Fisher; Moungi G Bawendi
Related Documents :
15450456 - Polymer-controlled synthesis of fe3o4 single-crystal nanorods.
24243626 - Accelerated self-replication under non-equilibrium, periodic energy delivery.
21809866 - Reaction dynamics of a molecular switch unveiled by coherent two-dimensional electronic...
20356166 - Polyelectrolyte multilayer-assisted immobilization of zero-valent iron nanoparticles on...
15524506 - Consistent description of quantum brownian motors operating at strong friction.
18352396 - Temperature and quantum effects in the stability of pure and doped gold nanowires.
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    
Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Nanoparticles / chemistry*
Spectrometry, Fluorescence
Time Factors
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Spontaneous Formation of Surface Antisite Defects in the Stabilization of the Sb-Rich GaSb(001) Surf...
Next Document:  Transient Fluorescence of the Off State in Blinking CdSe/CdS/ZnS Semiconductor Nanocrystals Is Not G...