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      Near-Infrared-Emitting five-monolayer thick copper-doped CdSe nanoplatelets

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      Embargo Lift Date: 2020-11-19
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      Author(s)
      Sharma, Ashma
      Sharma, Manoj
      Güngör, Kıvanç
      Olutaş, Murat
      Dede, Didem
      Demir, Hilmi Volkan
      Date
      2019
      Source Title
      Advanced Optical Materials
      Print ISSN
      2195-1071
      Publisher
      WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
      Volume
      7
      Issue
      22
      Pages
      1900831-1 - 1900831-8
      Language
      English
      Type
      Article
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      Abstract
      Doped nanocrystals are instrumental to the high‐performance luminescent solar concentrators (LSCs) and the color conversion devices. Recently, copper (Cu)‐doped three and four monolayer (ML) thick CdSe nanoplatelets (NPLs) have been shown superior to the existing Cu‐doped quantum dots (QDs) for their use in LSCs. However, additional improvement in the LSC performance can be achieved by further redshifting the emission into the near‐infrared (NIR) region of electromagnetic spectrum and increasing the absorbed portion of the solar irradiation. Cu‐doping into higher thicknesses of these atomically flat NPLs (e.g., ≥5 ML) can achieve these overarching goals. However, addition of the dopant ions during the nucleation stage disturbs this high‐temperature growth process and leads to multiple populations of NPLs and QDs. Here, by carefully controlling the precursor chemistry the successful doping of Cu in five ML thick NPLs by high‐temperature nucleation doping method is demonstrated. The optimized synthesis method shows nearly pure population of doped five ML thick NPLs, which possess ≈150 nm Stokes‐shifted NIR emission with high quantum yield of 65 ± 2%. Structural, elemental, and optical studies are conducted to confirm the successful doping and understand the detailed photophysics. Finally, these materials are tested experimentally and theoretically for their performance as promising LSC materials.
      Keywords
      CdSe nanoplatelets
      Colloidal quantum wells
      Copper
      Doping
      Luminescent solar concentrators
      Near‐infrared emission
      Stokes shift
      Permalink
      http://hdl.handle.net/11693/53203
      Published Version (Please cite this version)
      https://doi.org/10.1002/adom.201900831
      Collections
      • Department of Electrical and Electronics Engineering 3863
      • Department of Physics 2485
      • Institute of Materials Science and Nanotechnology (UNAM) 2098
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