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      Deep-red-emitting colloidal quantum well light-emitting diodes enabled through a complex design of core/crown/double shell heterostructure

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      Author(s)
      Shabani, Farzan
      Dehghanpour Baruj, Hamed
      Yurdakul, Iklim
      Delikanlı, Savaş
      Gheshlaghi, Negar
      Işık, Furkan
      Liu, B.
      Altıntaş, Yemliha
      Canımkurbey, Betül
      Demir, Hilmi Volkan
      Date
      2022-02-24
      Source Title
      Small
      Print ISSN
      1613-6810
      Electronic ISSN
      1613-6829
      Publisher
      Wiley
      Volume
      18
      Issue
      8
      Pages
      2106115-1 - 2106115-10
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      Extending the emission peak wavelength of quasi-2D colloidal quantum wells has been an important quest to fully exploit the potential of these materials, which has not been possible due to the complications arising from the partial dissolution and recrystallization during growth to date. Here, the synthetic pathway of (CdSe/CdS)@(1-4 CdS/CdZnS) (core/crown)@(colloidal atomic layer deposition shell/hot injection shell) hetero-nanoplatelets (NPLs) using multiple techniques, which together enable highly efficient emission beyond 700 nm in the deep-red region, is proposed and demonstrated. Given the challenges of using conventional hot injection procedure, a method that allows to obtain sufficiently thick and passivated NPLs as the seeds is developed. Consequently, through the final hot injection shell coating, thick NPLs with superior optical properties including a high photoluminescence quantum yield of 88% are achieved. These NPLs emitting at 701 nm exhibit a full-width-at-half-maximum of 26 nm, enabled by the successfully maintained quasi-2D shape and minimum defects of the resulting heterostructure. The deep-red light-emitting diode (LED) device fabricated with these NPLs has shown to yield a high external quantum efficiency of 6.8% at 701 nm, which is on par with other types of LEDs in this spectral range. © 2021 Wiley-VCH GmbH
      Keywords
      Colloidal quantum wells
      Deep-red
      Hot injection
      Light-emitting diodes
      Semiconductor nanoplatelets
      Permalink
      http://hdl.handle.net/11693/111252
      Published Version (Please cite this version)
      https://doi.org/10.1002/smll.202106115
      Collections
      • Department of Electrical and Electronics Engineering 4011
      • Department of Physics 2550
      • Institute of Materials Science and Nanotechnology (UNAM) 2258
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