WoS İndeksli Yayınlar Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12573/394

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Subject: search.filters.subject.Nanocrystals

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Now showing 1 - 4 of 4
  • Article
    Citation - WoS: 6
    Citation - Scopus: 5
    Photoluminescent and Superhydrophobic Nanocomposites of Perovskite Nanocrystals
    (Elsevier, 2024-03) Ocal, Sema Karabel; Celik, Nusret; Onses, M. Serdar; Mutlugun, Evren; Karabel Ocal, Sema
    Perovskite nanocrystals (PNCs) have found extensive utility across diverse technological applications in optoelectronics; nevertheless, their susceptibility to environmental instability poses a significant constraint on their practicality. Within this investigation, we present a novel and facile approach for the development of highly stable superhydrophobic PNCs. These engineered superhydrophobic perovskite nanocrystal composites, referred to as HSNPs@PNCs, demonstrate remarkable optoelectronic attributes, provided that their inherent instability can be effectively mitigated. HSNPs@PNCs manifest an impressive water contact angle of 172 degrees and an exceedingly low sliding angle of 1 degrees, thus showcasing their exceptional superhydrophobicity. Of particular note is the extraordinary stability exhibited by HSNPs@PNCs despite aqueous environments, thermal fluctuations, and UV exposure. Remarkably, even after a prolonged 30 -day immersion in water, this nanocomposite maintains an outstanding emission efficiency of 75 %. Furthermore, the method of application through a spray deposition technique circumvents sample size limitations, thereby amplifying their suitability for industrial applications. Moreover, this study extends the practicality of HSNPs@PNCs by enabling their homogeneous coating onto various surfaces such as glass, fabric, and aluminum, yielding luminescent superhydrophobic surfaces. This approach liberates the substrates from constraints, significantly broadening the potential spectrum of applications for these materials within diverse industrial and technological domains.
  • Conference Object
    Citation - Scopus: 1
    Color Simulation and Demonstration of Perovskite Nanocrystal Filters for Wide Color Gamut Displays
    (Institute of Electrical and Electronics Engineers Inc., 2018-09) Genc, Sinan; Yazici, Ahmet F.; Beskazak, Emre; Uran, Can; Mutlugün, Evren
    In this study, we define spectral parameters of perovskite nanocrystals to improve LCD color gamut, replacing color filters (CFs) with perovskite based subpixels. The optimization of the CFs has been enhanced 15.8% (98.43% of Rec.2020) in simulation and 13.8% experimentally, with 97.37% color gamut coverage. © 2019 Elsevier B.V., All rights reserved.
  • Article
    Citation - WoS: 2
    Citation - Scopus: 2
    Cation Exchange Mediated Synthesis of Bright Au@ZnTe Core-Shell Nanocrystals
    (IOP Publishing Ltd, 2020-10-16) Sadeghi, Sadra; Melikov, Rustamzhon; Sahin, Mehmet; Nizamoglu, Sedat
    The synthesis of heterostructured core-shell nanocrystals has attracted significant attention due to their wide range of applications in energy, medicine and environment. To further extend the possible nanostructures, non-epitaxial growth is introduced to form heterostructures with large lattice mismatches, which cannot be achieved by classical epitaxial growth techniques. Here, we report the synthetic procedure of Au@ZnTe core-shell nanostructures by cation exchange reaction for the first time. For that, bimetallic Au@Ag heterostructures were synthesized by using PDDA as stabilizer and shape-controller. Then, by addition of Te and Zn precursors in a step-wise reaction, the zinc and silver cation exchange was performed and Au@ZnTe nanocrystals were obtained. Structural and optical characterization confirmed the formation of the Au@ZnTe nanocrystals. The optimization of the synthesis led to the bright nanocrystals with a photoluminescence quantum yield up to 27%. The non-toxic, versatile synthetic route, and bright emission of the synthesized Au@ZnTe nanocrystals offer significant potential for future bio-imaging and optoelectronic applications.
  • Article
    Citation - WoS: 51
    Citation - Scopus: 53
    CdSe/ZnS Quantum Dot Films for High Performance Flexible Lighting and Display Applications
    (IOP Publishing Ltd, 2016-06-10) Altintas, Yemliha; Genc, Sinan; Talpur, Mohammad Younis; Mutlugun, Evren
    Colloidal quantum dots have attracted significant interest in recent years for lighting and display applications and have recently appeared in high-end market products. The integration of quantum dots with light emitting diodes has made them promising candidates for superior lighting applications with tunable optical characteristics. In this work we propose and demonstrate high quality colloidal quantum dots in their novel free-standing film forms to allow high quality white light generation to address flexible lighting and display applications. High quality quantum dots have been characterized using transmission electron microscopy, x-ray diffraction, x-ray photoelectron spectroscopy, steady state and time resolved photoluminescence and dynamic light scattering methods. The engineering of colloidal quantum dot composition and its optical properties in stand-alone film form has led to the experimentally high NTSC color gamut of 122.5 (CIE-1931) for display applications, color rendering index of 88.6, luminous efficacy of optical radiation value of 290 lm/W-opt and color temperature of 2763 K for lighting applications.