Now showing items 1-17 of 17

    • Bio-nanohybrids of quantum dots and photoproteins facilitating strong nonradiative energy transfer 

      Seker U.O.S.; Mutlugun, E.; Hernandez-Martinez, R. L.; Sharma, V. K.; Lesnyak, V.; Gaponik N.; Eychmuller, A.; Demir, Hilmi Volkan (Royal Society of Chemistry, 2013-05-21)
      Utilization of light is crucial for the life cycle of many organisms. Also, many organisms can create light by utilizing chemical energy emerged from biochemical reactions. Being the most important structural units of the ...
    • Critical role of CdSe nanoplatelets in color-converting CdSe/ZnS nanocrystals for InGaN/GaN light-emitting diodes 

      Hasanov N.; Sharma, V. K.; Martinez, P. L. H.; Tan S.T.; Demir, Hilmi Volkan (OSA - The Optical Society, 2016)
      Here we report CdSe nanoplatelets that are incorporated into color-converting CdSe/ZnS nanocrystals for InGaN/GaN light-emitting diodes. The critical role of CdSe nanoplatelets as an exciton donor for the color conversion ...
    • Engineered peptides for nanohybrid assemblies 

      Seker U.O.S.; Sharma, V. K.; Akhavan S.; Demir, Hilmi Volkan (American Chemical Society, 2014-02-04)
      Inspired by biological material synthesis, synthetic biomineralization peptides have been screened through a laboratory evolution using biocombinatorial techniques. In this study, using the fine examples in nature, silica ...
    • Exciton dynamics in colloidal quantum-dot LEDs under active device operations 

      Shendre, S.; Sharma, V. K.; Dang C.; Demir, Hilmi Volkan (American Chemical Society, 2018)
      Colloidal quantum-dot light-emitting diodes (QLEDs) are lucrative options for color-pure lighting sources. To achieve high-performance QLEDs, besides developing high-efficiency quantum dots (QDs), it is essential to ...
    • Fluorescent heterodoped nanotetrapods as synergistically enhancing positive and negative magnetic resonance imaging contrast agents 

      Sharma, V. K.; Alipour, A.; Soran-Erdem Z.; Kelestemur Y.; Aykut, Z. G.; Demir, Hilmi Volkan (American Chemical Society, 2016)
      In this work, we report Mn-Fe heterodoped ZnSe tetrapod nanocrystals (NCs) synthesized to synergistically enhance contrast in both T1- and T2-weighted magnetic resonance imaging (MRI). The proposed NCs were prepared using ...
    • High brightness formamidinium lead bromide perovskite nanocrystal light emitting devices 

      Perumal, A.; Shendre, S.; Li, M.; Tay, Y. K. E.; Sharma, V. K.; Chen, S.; Wei, Z.; Liu, Q.; Gao, Y.; Buenconsejo, P. J. S.; Tan S.T.; Gan, C. L.; Xiong, Q.; Sum, T. C.; Demir, Hilmi Volkan (Nature Publishing Group, 2016)
      Formamidinium lead halide (FAPbX3) has attracted greater attention and is more prominent recently in photovoltaic devices due to its broad absorption and higher thermal stability in comparison to more popular methylammonium ...
    • Highly monodisperse low-magnetization magnetite nanocubes as simultaneous T1–T2 MRI contrast agents 

      Sharma, V. K.; Alipour, A.; Soran-Erdem, Z.; Aykut, Z. G.; Demir, Hilmi Volkan (Royal Society of Chemistry, 2015)
      We report the first study of highly monodisperse and crystalline iron oxide nanocubes with sub-nm controlled size distribution (9.7 ± 0.5 nm in size) that achieve simultaneous contrast enhancement in both T<inf>1</inf>- ...
    • Impurity incorporation and exchange interactions in Co2+-doped CdSe/CdS core/shell nanoplatelets 

      Fainblat, R.; Delikanlı, Savaş; Spee, L.; Czerny, T.; Işık, Furkan; Sharma, V. K.; Demir, Hilmi Volkan; Bacher, G. (American Institute of Physics, 2019)
      The intentional incorporation of transition metal impurities into colloidal semiconductor nanocrystals allows an extension of the host material’s functionality. While dopant incorporation has been extensively investigated ...
    • Large-Area (over 50 cm × 50 cm) Freestanding Films of Colloidal InP/ZnS Quantum Dots 

      Mutlugun, E.; Hernandez Martinez, P. L.; Eroglu, C.; Coskun, Y.; Erdem, T.; Sharma, V. K.; Unal, E.; Panda, S. K.; Hickey, S. G.; Gaponik, N.; Eychmuller, A.; Demir, Hilmi Volkan (American Chemical Society, 2012)
      We propose and demonstrate the fabrication of flexible, freestanding films of InP/ZnS quantum dots (QDs) using fatty acid ligands across very large areas (greater than 50 cm x 50 cm), which have been developed for remote ...
    • Large-area semi-transparent light-sensitive nanocrystal skins 

      Akhavan, S.; Guzelturk, B.; Sharma, V. K.; Demir, Hilmi Volkan (Optical Society of America, 2012)
      We report a large-area, semi-transparent, light-sensitive nanocrystal skin (LS-NS) platform consisting of single monolayer colloidal nanocrystals. LS-NS devices, which were fabricated over areas up to 48 cm(2) using ...
    • Manganese doped fluorescent paramagnetic nanocrystals for dual-modal imaging 

      Sharma, V. K.; Gokyar, S.; Kelestemur, Y.; Erdem, T.; Unal, E.; Demir, Hilmi Volkan (Wiley-VCH Verlag, 2014)
      In this work, dual-modal (fluorescence and magnetic resonance) imaging capabilities of water-soluble, low-toxicity, monodisperse Mn-doped ZnSe nanocrystals (NCs) with a size (6.5 nm) below the optimum kidney cutoff limit ...
    • Stable and efficient colour enrichment powders of nonpolar nanocrystals in LiCl 

      Erdem, T.; Soran-Erdem Z.; Sharma, V. K.; Keleştemur, Y.; Adam, M.; Gaponik N.; Demir, Hilmi Volkan (Royal Society of Chemistry, 2015)
      In this work, we propose and develop the inorganic salt encapsulation of semiconductor nanocrystal (NC) dispersion in a nonpolar phase to make a highly stable and highly efficient colour converting powder for colour ...
    • Study of exciton transfer in dense quantum dot nanocomposites 

      Guzelturk, B.; Hernandez-Martinez, P. L.; Sharma, V. K.; Coskun, Y.; Ibrahimova, V.; Tuncel, D.; Govorov, A. O.; Sun, X. W.; Xiong, Q.; Demir, Hilmi Volkan (Royal Society of Chemistry, 2014)
      Nanocomposites of colloidal quantum dots (QDs) integrated into conjugated polymers (CPs) are key to hybrid optoelectronics, where engineering the excitonic interactions at the nanoscale is crucial. For such excitonic ...
    • Sweet plasmonics: sucrose macrocrystals of metal nanoparticles 

      Erdem, T.; Soran - Erdem, Z.; Hernandez - Martinez, P. L.; Sharma, V. K.; Akçalı, H.; Akçalı, I.; Gaponik N.; Eychmuller, A.; Demir, Hilmi Volkan (Tsinghua University Press, 2015-03)
      The realization of plasmonic structures generally necessitates expensive fabrication techniques, such as electron beam and focused ion beam lithography, allowing for the top-down fabrication of low-dimensional structures. ...
    • Temperature-dependent optoelectronic properties of quasi-2D colloidal cadmium selenide nanoplatelets 

      Bose, S.; Shendre, S.; Song, Z.; Sharma, V. K.; Zhang, D. H.; Dang C.; Fan, W.; Demir, Hilmi Volkan (Royal Society of Chemistry, 2017)
      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 ...
    • Tunable White-Light-Emitting Mn-Doped ZnSe Nanocrystals 

      Sharma, V. K.; Guzelturk, B.; Erdem, T.; Kelestemur, Y.; Demir, Hilmi Volkan (American Chemical Society, 2014-02-06)
      We report white-light-emitting Mn-doped ZnSe nanocrystals (NCs) that are synthesized using modified nucleation doping strategy. Tailoring three distinct emission mechanisms in these NCs, which are MnSe-related blue emission ...
    • Ultralow threshold one-photon-and two-photon-pumped optical gain media of blue-emitting colloidal quantum dot films 

      Guzelturk, B.; Kelestemur, Y.; Akgul, M. Z.; Sharma, V. K.; Demir, Hilmi Volkan (American Chemical Society, 2014)
      Colloidal quantum dots (QDs) offer advantageous properties as an optical gain media for lasers. Optical gain in the QDs has been shown in the whole visible spectrum, yet it has been intrinsically challenging to realize ...