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      Temperature-dependent optoelectronic properties of quasi-2D colloidal cadmium selenide nanoplatelets

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      Author(s)
      Bose, S.
      Shendre, S.
      Song, Z.
      Sharma, V. K.
      Zhang, D. H.
      Dang C.
      Fan, W.
      Demir, Hilmi Volkan
      Date
      2017
      Source Title
      Nanoscale
      Print ISSN
      2040-3364
      Publisher
      Royal Society of Chemistry
      Volume
      9
      Issue
      19
      Pages
      6595 - 6605
      Language
      English
      Type
      Article
      Item Usage Stats
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      258
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      Abstract
      Colloidal cadmium selenide (CdSe) nanoplatelets (NPLs) are a recently developed class of efficient luminescent nanomaterials suitable for optoelectronic device applications. A change in temperature greatly affects their electronic bandstructure and luminescence properties. It is important to understand how and why the characteristics of NPLs are influenced, particularly at elevated temperatures, where both reversible and irreversible quenching processes come into the picture. Here we present a study of the effect of elevated temperatures on the characteristics of colloidal CdSe NPLs. We used an effective-mass envelope function theory based 8-band k·p model and density-matrix theory considering exciton-phonon interaction. We observed the photoluminescence (PL) spectra at various temperatures for their photon emission energy, PL linewidth and intensity by considering the exciton-phonon interaction with both acoustic and optical phonons using Bose-Einstein statistical factors. With a rise in temperature we observed a fall in the transition energy (emission redshift), matrix element, Fermi factor and quasi Fermi separation, with a reduction in intraband state gaps and increased interband coupling. Also, there was a fall in the PL intensity, along with spectral broadening due to an intraband scattering effect. The predicted transition energy values and simulated PL spectra at varying temperatures exhibit appreciable consistency with the experimental results. Our findings have important implications for the application of NPLs in optoelectronic devices, such as NPL lasers and LEDs, operating much above room temperature.
      Keywords
      Cadmium
      Density functional theory
      Excitons
      Light emitting diodes
      Luminescence
      Optoelectronic devices
      Phonons
      Semiconductor quantum wells
      Statistical mechanics
      Density matrix theory
      Effective-mass envelope-function
      Electronic band-structure
      Exciton-phonon interactions
      Luminescence properties
      Optoelectronic properties
      Photoluminescence spectrum
      Temperature dependent
      Cadmium compounds
      Permalink
      http://hdl.handle.net/11693/37239
      Published Version (Please cite this version)
      http://dx.doi.org/10.1039/c7nr00163k
      Collections
      • Department of Electrical and Electronics Engineering 4011
      • Department of Physics 2550
      • Institute of Materials Science and Nanotechnology (UNAM) 2258
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