Olivier Labeau

Publications (2)11.21 Total impact

• Source

  Available from: archives-ouvertes.fr

  Article: High resolution resonant photoluminescence excitation of CdSe∕ ZnS nanocrystals at low temperatures

  Olivier Labeau, Philippe Tamarat, Brahim Lounis
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  ABSTRACT: We present a new technique to perform high resolution resonant photoluminescence excitation of CdSe/ZnS nanocrystals. The method takes advantage of the long photoluminescence decay times (~ 1 µs) observed in this system at liquid helium temperatures. Resonant photoluminescence excitation can be performed using a tunable pulsed excitation and a time-gated detection. Spectral hole burning investigations on an ensemble of CdSe/ZnS nanocrystals lead to homogeneous linewidths of ~100 µeV for the band edge exciton state.
  Applied Physics Letters 01/2006; 88. · 3.84 Impact Factor
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  Available from: archives-ouvertes.fr

  Article: Temperature dependence of the luminescence lifetime of single CdSe/ZnS quantum dots.

  Olivier Labeau, Philippe Tamarat, Brahim Lounis
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  ABSTRACT: We study the temperature dependence of the luminescence decay of single CdSe/ZnS quantum dots between 2 and 140 K. For the first time, we observe a biexponential decay which was completely hidden in ensemble measurements. We find that the long time component strongly depends on temperature. This demonstrates that the band edge luminescence arises from two thermally mixed fine structure states, the dark ground state and the lowest bright one. To interpret our results, we derive the analytical expressions for the decay using a three level model. Fitting the experimental data leads directly to the lifetime of the states as well as their energy splitting.
  Physical Review Letters 07/2003; 90(25 Pt 1):257404. · 7.37 Impact Factor