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      Liquid-liquid diffusion ‐ assisted crystallization: a fast and versatile approach toward high quality mixed quantum dot ‐ salt crystals

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      Author
      Adam, M.
      Wang, Z.
      Dubavik, A.
      Stachowski, G. M.
      Meerbach, C.
      Soran-Erdem, Z.
      Rengers, C.
      Demir, Hilmi Volkan
      Gaponik N.
      Eychmuller, A.
      Date
      2015
      Source Title
      Advanced Functional Materials
      Print ISSN
      1616-301X
      Publisher
      Wiley-VCH Verlag
      Volume
      25
      Issue
      18
      Pages
      2638 - 2645
      Language
      English
      Type
      Article
      Item Usage Stats
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      186
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      Abstract
      Here, a new, fast, and versatile method for the incorporation of colloidal quantum dots (QDs) into ionic matrices enabled by liquid-liquid diffusion is demonstrated. QDs bear a huge potential for numerous applications thanks to their unique chemical and physical properties. However, stability and processability are essential for their successful use in these applications. Incorporating QDs into a tight and chemically robust ionic matrix is one possible approach to increase both their stability and processability. With the proposed liquid-liquid diffusion-assisted crystallization (LLDC), substantially accelerated ionic crystallization of the QDs is shown, reducing the crystallization time needed by one order of magnitude. This fast process allows to incorporate even the less stable colloids including initially oil-based ligand-exchanged QDs into salt matrices. Furthermore, in a modified two-step approach, the seed-mediated LLDC provides the ability to incorporate oil-based QDs directly into ionic matrices without a prior phase transfer. Finally, making use of their processability, a proof-of-concept white light emitting diode with LLDC-based mixed QD-salt films as an excellent color-conversion layer is demonstrated. These findings suggest that the LLDC offers a robust, adaptable, and rapid technique for obtaining high quality QD-salts.
      Keywords
      Light - emitting - diodes
      Colloidal nanocrystals
      Cdte nanocrystals
      Semiconductor nanocrystals
      Aqueous - solution
      Optical gain
      Fluorescence
      Electroluminescence
      Emission
      Polymer
      Permalink
      http://hdl.handle.net/11693/12864
      Published Version (Please cite this version)
      http://dx.doi.org/10.1002/adfm.201500552
      Collections
      • Department of Electrical and Electronics Engineering 3524
      • Department of Physics 2299
      • Institute of Materials Science and Nanotechnology (UNAM) 1775
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