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Multiple temperature regimes of radiative decay in CdSe nanocrystal quantum dots: Intrinsic limits to the dark-exciton lifetime

Appl. Phys. Lett. 82, 2793 (2003); doi:10.1063/1.1570923

Issue Date: 28 April 2003

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S. A. Crooker and T. Barrick
National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545

J. A. Hollingsworth and V. I. Klimov
Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
We investigate the strongly temperature-dependent radiative lifetime of electron–hole excitations in colloidal CdSe nanocrystal quantum dots over nearly three orders of magnitude in temperature (300 K to 380 mK). These studies reveal an intrinsic, radiative upper limit of ~1 µs for the storage of excitons below 2 K. At higher temperatures, exciton lifetimes are consistent with thermal activation from the dark-exciton ground state, but with two different activation thresholds. ©2003 American Institute of Physics.
History: Received 2 January 2003; accepted 5 March 2003
Permalink: http://link.aip.org/link/?APPLAB/82/2793/1
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KEYWORDS and PACS

Keywords
PACS
  • 78.67.Hc
    Optical properties of quantum dots
  • 78.55.Et
    Photoluminescence in II–VI semiconductors
  • 73.21.La
    Quantum dots (electron states/collective excitations)
  • 73.20.Mf
    Collective excitations (surface/interface states) including excitons, polarons, plasmons and other charge-density excitations
  • 73.22.Lp
    Collective excitations (nanoscale materials)
  • 71.35.Lk
    Exciton collective effects including Bose effects, phase space filling, and excitonic phase transitions
  • YEAR: 2003

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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REFERENCES (16)
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