Three-pulse photon echo peak shift measurements of capped cdse quantum dots

LJ McKimmie; CN Lincoln; J Jasieniak; TA Smith

Journal article

Three-pulse photon echo peak shift measurements of capped cdse quantum dots

LJ McKimmie, CN Lincoln, J Jasieniak, TA Smith

Journal of Physical Chemistry C | Published : 2010

DOI: 10.1021/jp9083103

Abstract

In this article, the results of femtosecond three-pulse photon echo peak shift (3-PEPS) measurements are reported for a series of cadmium selenide core-shell semiconductor nanocrystals. The peak shift data were found to be highly dependent on the shell compositions and particle morphologies. The static inhomogeneity parameter was found to vary from 10 cm-1 for highly isotropic particles to 170 cm-1 for particles with a broad size distribution. We also discuss the high-frequency (≈212 cm-1) longitudinal optical (LO) phonon and the low-frequency (≈13-19 cm-1) longitudinal acoustic (LA) phonon modes (ω00) and how the damping times and frequencies also depend on the choice of capping material. ©..

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University of Melbourne Researchers

Trevor Smith Author

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Grants

Awarded by Australian Research Council

Funding Acknowledgements

The authors acknowledge the support of the Nanoscience Research Group under Prof. Paul Mulvaney. L.J.M. thanks the University of Melbourne for an MRS scholarship, and T.A.S. acknowledges the financial support of the Australian Research Council (DP0452472 and CE0561787).