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The Band Edge Luminescence of Surface Modified CdSe Nanocrystallites

Published online by Cambridge University Press:  15 February 2011

M. Kuno
Affiliation:
Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA. 02139, mkkuno@mit.edu
J. K. Lee
Affiliation:
Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA. 02139, mkkuno@mit.edu
B. O. Dabbousi
Affiliation:
Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA. 02139, mkkuno@mit.edu
F. V. Mikulec
Affiliation:
Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA. 02139, mkkuno@mit.edu
M. G. Bawendi
Affiliation:
Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA. 02139, mkkuno@mit.edu
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Abstract

We study the band edge luminescence of CdSe nanocrystallites to determine the origin of this emission. Previous studies have attributed the band edge emission to the recombination of photo-generated carriers trapped in localized surface states. Recently a number of “dark exciton” theories have been proposed which explain the luminescence in terms of recombination through internal core states. To address this issue we modify the surface of CdSe nanocrystallites with a number of organic/inorganic ligands and monitor the effect this has on the energetics of the resonant and non-resonant band edge luminescence. Our results for nanocrystallites passivated with trioctylphosphine oxide (TOPO), ZnS, 4-Picoline, 4-(trifluoromethyl)thiophenol, and tris(2-ethylhexyl)phosphate are in agreement with a dark exciton description of the band edge luminescence.

Type
Research Article
Copyright
Copyright © Materials Research Society 1997

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References

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