Quantum efficiency of stimulated emission in colloidal semiconductor nanocrystal quantum dots

Chunfeng Zhang, Jian Xu, Ting Zhu, Fan Zhang, Zhanao Tan, Steven Schiff, Huaipeng Su, Shuai Gao, Andrew Y. Wang

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Abstract

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.

Original languageEnglish (US)
Article number035333
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number3
DOIs
StatePublished - Aug 6 2009

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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