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APS » Journals » Phys. Rev. Lett. » Volume 95 » Issue 23
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Phys. Rev. Lett. 95, 236804 (2005) [4 pages]

Frequency-Dependent Spontaneous Emission Rate from CdSe and CdTe Nanocrystals: Influence of Dark States

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A. F. van Driel1,*, G. Allan2, C. Delerue2, P. Lodahl3,†, W. L. Vos3,‡, and D. Vanmaekelbergh1
1Debye Institute, Utrecht University, P.O. Box 80 000, 3508 TA Utrecht, The Netherlands
2Département ISEN, IEMN (CNRS, UMR 8520), 41 Boulevard Vauban, 59046 Lille CEDEX, France
3Complex Photonic Systems (COPS), Department of Science and Technology and MESA+ Research Institute, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands

Received 10 June 2005; published 1 December 2005

We studied the rate of spontaneous emission from colloidal CdSe and CdTe nanocrystals at room temperature. The decay rate, obtained from luminescence decay curves, increases with the emission frequency in a supralinear way. This dependence is explained by the thermal occupation of dark exciton states at room temperature, giving rise to a strong attenuation of the rate of emission. The supralinear dependence is in agreement with the results of tight-binding calculations.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.236804
DOI:
10.1103/PhysRevLett.95.236804
PACS:
73.21.La, 78.47.+p, 78.55.Et, 78.67.Hc

*Electronic address: a.f.vandriel@phys.uu.nl

†Also at: Research Center COM, Technical University of Denmark, Dk-2800 Lyngby, Denmark.

‡Also at: FOM Institute for Atomic and Molecular Physics (AMOLF), NL-1098 SJ Amsterdam, The Netherlands.

 
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