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      White-emitting conjugated polymer nanoparticles with cross-linked shell for mechanical stability and controllable photometric properties in color-conversion LED applications

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      Author
      Park, Eun-Ju
      Erdem, T.
      Ibrahimova, V.
      Nizamoglu, S.
      Demir, Hilmi Volkan
      Tuncel, D.
      Date
      2011
      Source Title
      ACS Nano
      Print ISSN
      1936-0851
      Electronic ISSN
      1936-086X
      Volume
      5
      Issue
      4
      Pages
      2483 - 2492
      Language
      English
      Type
      Article
      Item Usage Stats
      161
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      136
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      Abstract
      We report on the synthesis and characterization of water-dispersible, mechanically stable conjugated polymer nanoparticles (CPNs) in shelled architecture with tunable emission and controllable photometric properties via cross-linking. Using a reprecipitation method, whiteemitting polymer nanoparticles are prepared in different sizes by varying the concentration of polymer; the emission kinetics are tuned by controlling the shell formation. For this purpose, polyfluorene derivatives containing azide groups are selected that can be decomposed under UV light to generate very reactive species, which opportunely facilitate the inter- and intra-cross-linking of polymer chains to form shells. Nanoparticles before and after UV treatment are characterized by various techniques. Their size and morphologies are determined by using dynamic light scattering (DLS) measurements and imaging techniques including scanning electron microscopy (SEM) and atomic force microscopy (AFM). For optical characterization, UV vis and steady-state and timeresolved fluorescent spectroscopies are performed. Solid-state behaviors of these CPNs are also investigated by forming films through drop-casting. Moreover, the photometric calculations are also performed for films and dispersions to determine the color quality. A device has been constructed to show proof-of-principle white light generation from these nanoparticles. Additionally, mechanical stability studies are performed and demonstrated that these nanoparticles are indeed mechanically stable by removing the solvent after cross-linking using a freeze-dryer and redispersing in water and THF. Optical and imaging data confirm that the redispersed particles preserve their shapes and sizes after cross-linking.
      Keywords
      Color conversion
      Conjugated polymer nanoparticles
      Cross-linked shell
      White light emission
      Azide group
      Before and after
      Color conversions
      Color quality
      Conjugated polymer nanoparticles
      Cross-linked shells
      Different sizes
      Drop-casting
      Emitting polymers
      Imaging data
      Mechanically stable
      Optical characterization
      Photometric properties
      Polyfluorene derivative
      Polymer chains
      Polymer nanoparticles
      Proof of principles
      Reactive species
      Reprecipitation methods
      SEM
      Shell formation
      State behavior
      Time-resolved fluorescent spectroscopy
      Tunable emissions
      UV light
      UV treatment
      Water dispersible
      White light emission
      White-light generation
      Atomic force microscopy
      Casting
      Color
      Dynamic light scattering
      Imaging techniques
      Light emission
      Mechanical properties
      Mechanical stability
      Nanoparticles
      Photometry
      Scanning electron microscopy
      Shells (structures)
      Conjugated polymers
      Permalink
      http://hdl.handle.net/11693/21952
      Published Version (Please cite this version)
      http://dx.doi.org/10.1021/nn103598q
      Collections
      • Department of Chemistry 594
      • Department of Electrical and Electronics Engineering 3524
      • Department of Physics 2299
      • Institute of Materials Science and Nanotechnology (UNAM) 1775
      • Nanotechnology Research Center (NANOTAM) 1006
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