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      CdSe/CdSe1-xTex core/crown heteronanoplatelets: tuning the excitonic properties without changing the thickness

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      Author(s)
      Kelestemur Y.
      Guzelturk, B.
      Erdem, O.
      Olutas M.
      Erdem, T.
      Usanmaz, C. F.
      Gungor K.
      Demir, Hilmi Volkan
      Date
      2017
      Source Title
      Journal of Physical Chemistry C
      Print ISSN
      1932-7447
      Publisher
      American Chemical Society
      Volume
      121
      Issue
      8
      Pages
      4650 - 4658
      Language
      English
      Type
      Article
      Item Usage Stats
      241
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      341
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      Abstract
      Here we designed and synthesized CdSe/CdSe1-xTex core/crown nanoplatelets (NPLs) with controlled crown compositions by using the core-seeded-growth approach. We confirmed the uniform growth of the crown regions with well-defined shape and compositions by employing transmission electron microscopy, X-ray photoelectron spectroscopy, and X-ray diffraction. By precisely tuning the composition of the CdSe1-xTex crown region from pure CdTe (x = 1.00) to almost pure CdSe doped with several Te atoms (x = 0.02), we achieved tunable excitonic properties without changing the thickness of the NPLs and demonstrated the evolution of type-II electronic structure. Upon increasing the Te concentration in the crown region, we obtained continuously tunable photoluminescence peaks within the range of ∼570 nm (for CdSe1-xTex crown with x = 0.02) and ∼660 nm (for CdSe1-xTex crown with x = 1.00). Furthermore, with the formation of the CdSe1-xTex crown region, we observed substantially improved photoluminescence quantum yields (up to ∼95%) owing to the suppression of nonradiative hole trap sites. Also, we found significantly increased fluorescence lifetimes from ∼49 up to ∼326 ns with increasing Te content in the crown, suggesting the transition from quasi-type-II to type-II electronic structure. With their tunable excitonic properties, this novel material presented here will find ubiquitous use in various efficient light-emitting and -harvesting applications.
      Keywords
      Electronic structure
      High resolution transmission electron microscopy
      Light emission
      Photoluminescence
      Transmission electron microscopy
      Tuning
      X ray diffraction
      Excitonic properties
      Fluorescence lifetimes
      Nano-platelets
      Non-radiative
      Novel materials
      Photoluminescence peak
      Photoluminescence quantum yields
      Seeded growth
      X ray photoelectron spectroscopy
      Permalink
      http://hdl.handle.net/11693/37299
      Published Version (Please cite this version)
      http://dx.doi.org/10.1021/acs.jpcc.6b11809
      Collections
      • Department of Electrical and Electronics Engineering 4011
      • Department of Physics 2550
      • Institute of Materials Science and Nanotechnology (UNAM) 2258
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