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      Green stimulated emission boosted by nonradiative resonant energy transfer from blue quantum dots

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      Author
      Gao, Y.
      Yu, G.
      Wang Y.
      Dang C.
      Sum, T. C.
      Sun, H.
      Demir, Hilmi Volkan
      Date
      2016
      Source Title
      Journal of Physical Chemistry Letters
      Print ISSN
      1948-7185
      Publisher
      American Chemical Society
      Volume
      7
      Issue
      14
      Pages
      2772 - 2778
      Language
      English
      Type
      Article
      Item Usage Stats
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      179
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      Abstract
      Thanks to their tunability and versatility, the colloidal quantum dots (CQDs) made of II-VI semiconductor compound offer the potential to bridge the "green gap" in conventional semiconductors. However, when the CQDs are pumped to much higher initial excitonic states compared to their bandgap, multiexciton interaction is enhanced, leading to a much higher stimulated emission threshold. Here, to circumvent this drawback, for the first time, we show a fully colloidal gain in green enabled by a partially indirect pumping approach assisted by Förster resonance energy transfer process. By introducing the blue CQDs as exciton donors, the lasing threshold of the green CQDs, is reduced dramatically. The blue CQDs thus serve as an energy-transferring buffer medium to reduce excitation energy from pumping photons in a controlled way by injecting photoinduced excitons into green CQDs. Our newly developed colloidal pumping scheme could enable efficient CQD lasers of full visible colors by a single pump source and cascaded exciton transfer. This would potentially pave the way for an efficient multicolor laser for lighting and display applications.
      Keywords
      Energy transfer
      Excitons
      Nanocrystals
      Pumping (laser)
      Semiconductor lasers
      Stimulated emission
      Colloidal quantum dots
      Display application
      Exciton transfer
      Lasing threshold
      Pumping schemes
      Resonance energy transfer
      Resonant energy transfer
      Semiconductor compounds
      Semiconductor quantum dots
      Permalink
      http://hdl.handle.net/11693/36735
      Published Version (Please cite this version)
      http://dx.doi.org/10.1021/acs.jpclett.6b01122
      Collections
      • Department of Electrical and Electronics Engineering 3524
      • Department of Physics 2299
      • Institute of Materials Science and Nanotechnology (UNAM) 1775
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