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Spectral Diffusion of Ultra-Narrow Fluorescence Spectra in Single Quantum Dots

Published online by Cambridge University Press:  15 February 2011

S. A. Empedocles ,
D. J. Norris  and
M. G. Bawendi
S. A. Empedocles
Affiliation:
Chemistry Department, Massachusetts Institute of Technology, 77 Massachusetts Ave. Cambridge, Ma. 02138
D. J. Norris
Affiliation:
Chemistry Department, Massachusetts Institute of Technology, 77 Massachusetts Ave. Cambridge, Ma. 02138
M. G. Bawendi
Affiliation:
Chemistry Department, Massachusetts Institute of Technology, 77 Massachusetts Ave. Cambridge, Ma. 02138
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Abstract

We collect and spectrally resolve photoluminescence from single CdSe nanocrystallite quantum dots. By eliminating spectral inhomogeneities, we reveal resolution limited linewidths < 120μev at 10K. These lines are more than fifty times narrower than what has previously been reported using ensemble measurements. Light driven spectral diffusion is seen as a form of power broadening and may be the cause of surprisingly broad linewidths at room temperature. In addition, we see no evidence of excited state emission or coupling to acoustic phonons.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 452 , 1996 , 335
Copyright
Copyright © Materials Research Society 1997

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References

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