Quantum efficiency of stimulated emission in colloidal semiconductor nanocrystal quantum dots

  • Zhang C
  • Xu J
  • Zhu T
 et al. 
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External differential quantum efficiencies were studied for the stimulated emission of thin films of colloidal CdSe/CdS/ZnS nanocrystal quantum dots (NQDs) using the integrating sphere technique. A maximum efficiency of 34% was measured for the stimulated emission in NQDs which far exceeds that for spontaneous emission (9%). The competition between the radiative exciton/biexciton recombination and the carrier density-dependent nonradiative relaxation processes in NQDs was modeled to account for the observed difference in efficiency. © 2009 The American Physical Society.

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  • C Zhang

  • J Xu

  • T Zhu

  • F Zhang

  • Z Tan

  • S J Schiff

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