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

Research output: Contribution to journalArticle

12 Citations (Scopus)

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

Fingerprint

Stimulated emission
stimulated emission
Quantum efficiency
Nanocrystals
Semiconductor quantum dots
quantum efficiency
nanocrystals
quantum dots
Semiconductor materials
Spontaneous emission
Relaxation processes
Excitons
spontaneous emission
Carrier concentration
excitons
Thin films
thin films

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Zhang, Chunfeng ; Xu, Jian ; Zhu, Ting ; Zhang, Fan ; Tan, Zhanao ; Schiff, Steven ; Su, Huaipeng ; Gao, Shuai ; Wang, Andrew Y. / Quantum efficiency of stimulated emission in colloidal semiconductor nanocrystal quantum dots. In: Physical Review B - Condensed Matter and Materials Physics. 2009 ; Vol. 80, No. 3.
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Quantum efficiency of stimulated emission in colloidal semiconductor nanocrystal quantum dots. / Zhang, Chunfeng; Xu, Jian; Zhu, Ting; Zhang, Fan; Tan, Zhanao; Schiff, Steven; Su, Huaipeng; Gao, Shuai; Wang, Andrew Y.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 80, No. 3, 035333, 06.08.2009.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Quantum efficiency of stimulated emission in colloidal semiconductor nanocrystal quantum dots

AU - Zhang, Chunfeng

AU - Xu, Jian

AU - Zhu, Ting

AU - Zhang, Fan

AU - Tan, Zhanao

AU - Schiff, Steven

AU - Su, Huaipeng

AU - Gao, Shuai

AU - Wang, Andrew Y.

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