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Quantum Confined Electron-Hole States in ZnSe Quantum Dots

Published online by Cambridge University Press:  10 February 2011

H. W. H. Lee ,
C. A. Smith ,
V. J. Leppert  and
S. H. Risbud
H. W. H. Lee
Affiliation:
Lawrence Livermore National Laboratory, P. 0. Box 808, Livermore, CA 94551, hwhlee@llnl.gov
C. A. Smith
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Davis, CA 95616
V. J. Leppert
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Davis, CA 95616
S. H. Risbud
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Davis, CA 95616
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Abstract

We observed the quantum confined bandedge emission from ZnSe quantum dots and the size dependence of the energy states, spin-orbit interaction, and Stokes shift. The bandedge emission occurs in the UV-blue. The energy gap = Eg + C/dn where d is the diameter and n is 1. 19 ± 0.13 and 1.21 ± 0.13 for the first and second electron-hole transitions, respectively. The separation between these transitions approaches the bulk spin-orbit splitting, while the Stokes shift decreases with particle size. Effective mass theories can not explain these results. Trap emission is observed in some samples in the green and red, resulting from Se-related traps.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 571: Symposium W – Semiconductor Quantum Dots , 1999 , 259
Copyright
Copyright © Materials Research Society 2000

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References

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