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      Unraveling the ultralow threshold stimulated emission from CdZnS/ZnS quantum dot and enabling high ‐ Q microlasers

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      Author(s)
      Wang Y.
      Fong, K. E.
      Yang, S.
      Ta, V.
      Gao, Y.
      Wang, Z.
      Nalla, V.
      Demir, Hilmi Volkan
      Sun, H.
      Date
      2015
      Source Title
      Laser and Photonics Reviews
      Print ISSN
      1863-8880
      Publisher
      Wiley-VCH Verlag
      Volume
      9
      Issue
      5
      Pages
      507 - 516
      Language
      English
      Type
      Article
      Item Usage Stats
      251
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      315
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      Abstract
      The newly engineered ternary CdZnS/ZnS colloidal quantum dots (CQDs) are found to exhibit remarkably high photoluminescence quantum yield and excellent optical gain properties. However, the underlying mechanisms, which could offer the guidelines for devising CQDs for optimized photonic devices, remain undisclosed. In this work, through comprehensive steady-state and time-resolved spectroscopy studies on a series of CdZnS-based CQDs, we unambiguously clarify that CdZnS-based CQDs are inherently superior optical gain media in the blue spectral range due to the slow Auger process and that the ultralow threshold stimulated emission is enabled by surface/interface engineering. Furthermore, external cavity-free high-Q quasitoroid microlasers were produced from self-assembly of CdZnS/ZnS CQDs by facile inkjet printing technique. Detailed spectroscopy analysis confirms the whispering gallery mode lasing mechanism of the quasitoroid microlasers. This tempting microlaser fabrication method should be applicable to other solution-processed gain materials, which could trigger broad research interests. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA.
      Keywords
      Auger recombination
      CdZnS/ZnS quantum dots
      Multiphoton excitation
      Stimulated emission
      Toroid laser
      Augers
      Ink jet printing
      Laser excitation
      Laser spectroscopy
      Multiphoton processes
      Nanocrystals
      Neodymium lasers
      Optical emission spectroscopy
      Optical gain
      Optical properties
      Photonic devices
      Self assembly
      Semiconductor quantum dots
      Stimulated emission
      Whispering gallery modes
      Auger recombination
      Colloidal quantum dots
      Multiphoton excitation
      Optical gain properties
      Photoluminescence quantum yields
      Time-resolved spectroscopy
      Ultra - low threshold
      Whispering - gallery - mode lasing
      Quantum dot lasers
      Permalink
      http://hdl.handle.net/11693/23436
      Published Version (Please cite this version)
      http://dx.doi.org/10.1002/lpor.201500063
      Collections
      • Department of Electrical and Electronics Engineering 4012
      • Department of Physics 2551
      • Institute of Materials Science and Nanotechnology (UNAM) 2260
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