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      Continuously tunable emission in inverted type ‐ I CdS/CdSe core/crown semiconductor nanoplatelets

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      Author(s)
      Delikanlı, S.
      Güzeltürk, B.
      Hernandez - Martinez, P. L.
      Erdem, T.
      Keleştemur, Y.
      Olutas M.
      Akgül, M. Z.
      Demir, Hilmi Volkan
      Date
      2015-07-15
      Source Title
      Advanced functional materials
      Print ISSN
      1616-301X
      Publisher
      Wiley
      Volume
      25
      Issue
      27
      Pages
      4282 - 4289
      Language
      English
      Type
      Article
      Item Usage Stats
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      292
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      Abstract
      The synthesis and unique tunable optical properties of core/crown nanoplatelets having an inverted Type-I heterostructure are presented. Here, colloidal 2D CdS/CdSe heteronanoplatelets are grown with thickness of four monolayers using seed-mediated method. In this work, it is shown that the emission peak of the resulting CdS/CdSe heteronanoplatelets can be continuously spectrally tuned between the peak emission wavelengths of the core only CdS nanoplatelets (421 nm) and CdSe nanoplatelets (515 nm) having the same vertical thickness. In these inverted Type-I nanoplatelets, the unique continuous tunable emission is enabled by adjusting the lateral width of the CdSe crown, having a narrower bandgap, around the core CdS nanoplatelet, having a wider bandgap, as a result of the controlled lateral quantum confinement in the crown region additional to the pure vertical confinement. As a proof-of-concept demonstration, a white light generation is shown by using color conversion with these CdS/CdSe heteronanoplatelets having finely tuned thin crowns, resulting in a color rendering index of 80. The robust control of the electronic structure in such inverted Type-I heteronanoplatelets achieved by tailoring the lateral extent of the crown coating around the core template presents a new enabling pathway for bandgap engineering in solution-processed quantum wells.
      Keywords
      Nanocrystal quantum dots
      Sensitized solar - cells
      Core/shell nanocrystals
      Cdse nanocrystals
      Colloidal nanoplatelets
      Well system
      Growth
      Spectroscopy
      Cds/hgs/cds
      Thickness
      Permalink
      http://hdl.handle.net/11693/12851
      Published Version (Please cite this version)
      http://dx.doi.org/10.1002/adfm.201500403
      Collections
      • Department of Electrical and Electronics Engineering 3863
      • Department of Physics 2485
      • Institute of Materials Science and Nanotechnology (UNAM) 2098
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