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Fluorescence intermittency in single cadmium selenide nanocrystals

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Abstract

SEMICONDUCTOR nanocrystals offer the opportunity to study the evolution of bulk materials properties as the size of a system increases from the molecular scale1,2. In addition, their strongly size-dependent optical properties render them attractive candidates as tunable light absorbers and emitters in optoelectronic devices such as light-emitting diodes3,4 and quantum-dot lasers5,6, and as optical probes of biological systems7. Here we show that light emission from single fluorescing nanocrystals of cadmium selenide under continuous excitation turns on and off intermittently with a characteristic timescale of about 0.5 seconds. This intermittency is not apparent from ensemble measurements on many nanocrystals. The dependence on excitation intensity and the change in on/off times when a passivating, high-bandgap shell of zinc sulphide encapsulates the nanocrystal8,9 suggests that the abrupt turning off of luminescence is caused by photo-ionization of the nanocrystal. Thus spectroscopic measurements on single nanocrystals can reveal hitherto unknown aspects of their photophysics.

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Author notes

  1. M. Nirmal & L. E. Brus

    Present address: Department of Chemistry, Columbia University, New York, New York, 10027, USA

  2. J. J. Macklin, J. K. Trautman & T. D. Harris

    Present address: seQ Ltd, Princeton, New Jersey, 08540-6449, USA

Authors and Affiliations

  1. Dept of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts, 02139, USA

    M. Nirmal, B. O. Dabbousi & M. G. Bawendi

  2. Bell Laboratories, Lucent Technologies, 600 Mountain Avenue, Murray Hill, New Jersey, 07974, USA

    J. J. Macklin, J. K. Trautman, T. D. Harris & L. E. Brus

Authors
  1. M. Nirmal
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  2. B. O. Dabbousi
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  3. M. G. Bawendi
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  4. J. J. Macklin
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  5. J. K. Trautman
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  6. T. D. Harris
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  7. L. E. Brus
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Nirmal, M., Dabbousi, B., Bawendi, M. et al. Fluorescence intermittency in single cadmium selenide nanocrystals. Nature 383, 802–804 (1996). https://doi.org/10.1038/383802a0

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  • DOI: https://doi.org/10.1038/383802a0

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