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

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      Author(s)
      Murphy, J. R.
      Delikanlı, Savaş
      Zhang, T.
      Scrace, T. A.
      Zhang, P.
      Norden, T.
      Thomay, T.
      Cartwright, A. N.
      Demir, Himli Volkan
      Petrou, A.
      Date
      2017
      Source Title
      Proceedings of SPIE
      Print ISSN
      0277-786X
      Publisher
      SPIE
      Volume
      10114
      Language
      English
      Type
      Conference Paper
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      Abstract
      Colloidal semiconductor nanoplatelets (NPLs) are quasi 2D-nanostructures that are grown and processed inexpensively using a solution based method and thus have recently attracted considerable attention. We observe two features in the photoluminescence spectrum, suggesting two possible recombination channels. Their intensity ratio varies with temperature and two distinct temperature regions are identified; a low temperature region (10K < T < 90K) and a high temperature region (90K < T < 200K). This ratio increases with increasing temperature, suggesting that one recombination channel involves holes that are weakly localized with a localization energy of 0.043meV. A possible origin of these localized states are energy-variations in the xy-plane of the nanoplatelet. The presence of positive photoluminescence circular polarization in the magnetically-doped core/multi-shell NPLs indicates a hole-dopant exchange interaction and therefore the incorporated magnetic Manganese ions act as a marker that determines the location of the localized hole states.1 Time-resolved measurements show two distinct timescales (τfast and τslow) that can be modeled using a rate equation model. We identify these timescales as closely related to the corresponding recombination times for the channels. The stronger hole localization of one of these channels leads to a decreased electron-hole wave function overlap and thus a decreased oscillator strength and an increased lifetime. We show that we can model and understand the magnetic interaction of doped 2D-colloidal nanoplatelets which opens a pathway to solution processable spin controllable light sources. Copyright © 2017 SPIE.
      Keywords
      Doping (additives)
      Light sources
      Nanocrystals
      Nanostructures
      Photoluminescence
      Photoluminescence spectroscopy
      Semiconductor quantum dots
      Temperature
      Wave functions
      Colloidal semiconductors
      Increasing temperatures
      Low temperature regions
      Magnetic interactions
      Photoluminescence spectrum
      Recombination channels
      Time resolved measurement
      Time-resolved photoluminescence
      Magnetism
      Permalink
      http://hdl.handle.net/11693/37565
      Published Version (Please cite this version)
      https://doi.org/10.1117/12.2252266
      Collections
      • Department of Electrical and Electronics Engineering 4012
      • Department of Physics 2551
      • Institute of Materials Science and Nanotechnology (UNAM) 2260
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