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      Time-resolved photoluminescence study of CdSe/CdMnS/CdS core/multi-shell nanoplatelets

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      Author
      Murphy, J. R.
      Delikanli S.
      Scrace, T.
      Zhang, P.
      Norden, T.
      Thomay, T.
      Cartwright, A. N.
      Demir, Hilmi Volkan
      Petrou, A.
      Date
      2016
      Source Title
      Applied Physics Letters
      Print ISSN
      0003-6951
      Publisher
      American Institute of Physics Inc.
      Volume
      108
      Issue
      24
      Pages
      242406-1 - 242406-4
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      We used photoluminescence spectroscopy to resolve two emission features in CdSe/CdMnS/CdS and CdSe/CdS core/multi-shell nanoplatelet heterostructures. The photoluminescence from the magnetic sample has a positive circular polarization with a maximum centered at the position of the lower energy feature. The higher energy feature has a corresponding signature in the absorption spectrum; this is not the case for the low-energy feature. We have also studied the temporal evolution of these features using a pulsed-excitation/time-resolved photoluminescence technique to investigate their corresponding recombination channels. A model was used to analyze the temporal dynamics of the photoluminescence which yielded two distinct timescales associated with these recombination channels. The above results indicate that the low-energy feature is associated with recombination of electrons with holes localized at the core/shell interfaces; the high-energy feature, on the other hand, is excitonic in nature with the holes confined within the CdSe cores.
      Keywords
      Absorption spectroscopy
      Photoluminescence spectroscopy
      Emission features
      Magnetic samples
      Nano-platelets
      Pulsed excitation
      Recombination channels
      Temporal dynamics
      Temporal evolution
      Time-resolved photoluminescence
      Photoluminescence
      Permalink
      http://hdl.handle.net/11693/36652
      Published Version (Please cite this version)
      http://dx.doi.org/10.1063/1.4953840
      Collections
      • Department of Electrical and Electronics Engineering 3524
      • Department of Physics 2299
      • Institute of Materials Science and Nanotechnology (UNAM) 1775
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