Now showing items 1-20 of 20

    • All-optical control of exciton flow in a colloidal quantum well complex 

      Yu, J.; Sharma, Manoj; Sharma, A.; Delikanlı, Savaş; Demir, Hilmi Volkan; Dang, C. (Springer Nature, 2020)
      Excitonics, an alternative to romising for processing information since semiconductor electronics is rapidly approaching the end of Moore’s law. Currently, the development of excitonic devices, where exciton flow is ...
    • Anomalous spectral characteristics of ultrathin sub-nm colloidal CdSe nanoplatelets 

      Bose S.; Delikanlı, Savaş; Yeltik, Aydan; Sharma, Manoj; Erdem, Onur; Dang C.; Fan W.; Zhang D.H.; Demir, Hilmi Volkan (Optical Society of America, 2017)
      We demonstrate high quantum yield broad photoluminescence emission of ultrathin sub-nanometer CdSe nanoplatelets (two-monolayer). They also exhibit polarization-characterized lateral size dependent anomalous heavy hole and ...
    • CdSe/CdMnS nanoplatelets with bilayer core and magnetically doped shell exhibit switchable excitonic circular polarization: Implications for lasers and light-emitting diodes 

      Najafi, A.; Tarasek, S.; Delikanlı, Savaş; Zhang, P.; Norden, T.; Shendre, S.; Sharma, Manoj; Bhattacharya, A.; Taghipour, Nima; Pientka, J.; Dedmir, Hilmi Volkan; Thomay, T. (American Chemical Society, 2020-03)
      We utilized time-resolved photoluminescence (TRPL) spectroscopy to study the excitonic circular polarization (PX) from CdSe/CdMnS core/shell nanoplatelets (NPLs) with a bilayer core. This allows an extensive study of the ...
    • Coreless fiber‐based whispering‐gallery‐mode assisted lasing from colloidal quantum well solids 

      Sak, Mustafa; Taghipour, Nima; Delikanlı, Savaş; Shendre, S.; Tanrıöver, İbrahim; Gao, Y.; Yu, J.; Yanyan, Z.; Yoo, S.; Dang, C.; Demir, Hilmi Volkan; Foroutan, Sina (Wiley-VCH Verlag, 2020-01)
      Whispering gallery mode (WGM) resonators are shown to hold great promise to achieve high‐performance lasing using colloidal semiconductor nanocrystals (NCs) in solution phase. However, the low packing density of such ...
    • 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 ...
    • Inverted type-I CdS/CdSe core/crown colloidal quantum ring 

      Bose S.; Delikanlı, Savaş; Akgül, Mehmet Zafer; Gao Y.; Fan W.; Zhang D.H.; Demir, Hilmi Volkan (IEEE, 2017)
      Summary form only given. Inverted Type-I quantum rings (QRs) are a recently developed class of nanostructure in which a lower bandgap material is laterally grown as a crown of same thickness around a higher bandgap ...
    • Low-threshold optical gain and lasing of colloidal nanoplatelets 

      Keleştemur, Yusuf; Güzeltürk, Burak; Olutaş, Murat; Delikanlı, Savaş; Demir, Hilmi Volkan (IEEE, 2014-10)
      Semiconductor nanocrystals, which are also known as colloidal quantum dots (CQDs), are highly attractive materials for high performance optoelectronic device applications such as lasers. With their size, shape and composition ...
    • Magneto-optical studies of CdSe/CdMnS/CdS core/multi-shell colloidal nanoplatelets 

      Petrou, A.; Scrace, T. A.; Murphy, J. R.; Zhang, P.; Norden, T.; Zhang, T.; Thomay, T.; Cartwright, A. N.; Delikanlı, Savaş; Akgül, Mehmet Zafer; Demir, Hilmi Volkan (SPIE, 2016)
      We studied the photoluminescence (PL)) from CdSe/CdMnS/CdS core/multi-shell colloidal nanoplatelets, a versatile platform to study the interplay of optical properties and nanomagnetism. The photoluminescence (PL) exhibits ...
    • Magneto-optics of excitons interacting with magnetic ions in CdSe/CdMnS colloidal nanoplatelets 

      Shornikova, E. V.; Yakovlev, D. R.; Tolmachev, D. O.; Ivanov, V. Y.; Kalitukha, I. V.; Sapega, V. F.; Kudlacik, D.; Kusrayev, Y. G.; Golovatenko, A. A.; Shendre, S.; Delikanlı, Savaş; Demir, Hilmi Volkan; Bayer, M. (American Chemical Society, 2020-06)
      Excitons in diluted magnetic semiconductors represent excellent probes for studying the magnetic properties of these materials. Various magneto-optical effects, which depend sensitively on the exchange interaction of the ...
    • MoS2 phototransistor sensitized by colloidal semiconductor quantum wells 

      Sar, H.; Taghipour, Nima; Lisheshar, İ. W.; Delikanlı, Savaş; Demirtaş, M.; Demir, Hilmi Volkan; Ay, F.; Perkgöz, N. K. (Wiley-VCH Verlag, 2020-12)
      A phototransistor built by the assembly of 2D colloidal semiconductor quantum wells (CQWs) on a single layer of 2D transition metal dichalcogenide (TMD) is displayed. This hybrid device architecture exhibits high efficiency ...
    • Mutual energy transfer in a binary colloidal quantum well complex 

      Yu, J.; Sharma, Manoj; Delikanlı, Savaş; Birowosuto, M. D.; Demir, Hilmi Volkan; Dang, C. (American Chemical Society, 2019)
      Förster resonance energy transfer (FRET) is a fundamental process that is key to optical biosensing, photosynthetic light harvesting, and down-converted light emission. However, in total, conventional FRET in a donor–acceptor ...
    • Optically detected magnetic resonance in CdSe/CdMnS nanoplatelets 

      Tolmachev, D. O.; Ivanov, V. Y.; Yakovlev, D. R.; Shornikova, E. V.; Witkowski, B.; Shendre, S.; Işık, Furkan; Delikanlı, Savaş; Demir, Hilmi Volkan; Bayer, M. (Royal Society of Chemistry, 2020)
      Core/shell CdSe/(Cd,Mn)S colloidal nanoplatelets containing magnetic Mn2+ ions are investigated by the optically detected magnetic resonance technique, combining 60 GHz microwave excitation and photoluminescence detection. ...
    • Persuasive evidence for electron–nuclear coupling in diluted magnetic colloidal nanoplatelets using optically detected magnetic resonance spectroscopy 

      Strassberg, R.; Delikanlı, Savaş; Barak, Y.; Dehnel, J.; Kostadinov, A.; Maikov, G.; Hernandez-Martinez, P. L.; Sharma, Manoj; Demir, Hilmi Volkan; Lifshitz, E. (American Chemical Society, 2019)
      The incorporation of magnetic impurities into semiconductor nanocrystals with size confinement promotes enhanced spin exchange interaction between photogenerated carriers and the guest spins. This interaction stimulates ...
    • Strong plasmon-wannier mott exciton interaction with high aspect ratio colloidal quantum wells 

      Yu, J.; Hou, S.; Sharma, Manoj; Tobing, L. Y. M.; Song, Z.; Delikanlı, Savaş; Hettiarachchi, C.; Zhang, D.; Fan, W.; Birowosuto, M. D.; Wang, H.; Demir, Hilmi Volkan; Dang, C. (Cell Press, 2020)
      The strong interaction between excitons and plasmons, manifested as Rabi splitting of the eigen energies, is of fundamental interest for manipulating photons in nanoscale devices. Thanks to their enhanced photostability ...
    • Sub-single exciton optical gain threshold in colloidal semiconductor quantum wells with gradient alloy shelling 

      Taghipour, Nima; Delikanlı, Savaş; Shendre, S.; Sak, Mustafa; Li, M.; Işık, Furkan; Tanrıöver, İbrahim; Güzeltürk, B.; Sum, T. C.; Demir, Hilmi Volkan (Nature Research, 2020)
      Colloidal semiconductor quantum wells have emerged as a promising material platform for use in solution-processable lasers. However, applications relying on their optical gain suffer from nonradiative Auger decay due to ...
    • Time resolved photoluminescence study of magnetic CdSe/CdMnS/CdS core/multi-shell nanoplatelets 

      Murphy, J. R.; Delikanlı, Savaş; Zhang, T.; Scrace, T. A.; Zhang, P.; Norden, T.; Thomay, T.; Cartwright, A. N.; Demir, Himli Volkan; Petrou, A. (SPIE, 2017)
      Colloidal semiconductor nanoplatelets (NPLs) are quasi 2D-nanostructures that are grown and processed inexpensively using a solution based method and thus have recently attracted considerable attention. We observe two ...
    • Two-dimensional CdSe-based nanoplatelets: their heterostructures, doping, photophysical properties, and applications 

      Sharma, Manoj; Delikanlı, Savaş; Demir, Hilmi Volkan (Institute of Electrical and Electronics Engineers, 2020)
      In the past decade, colloidal quantum wells, also known as 2-D semiconductor nanoplatelets (NPLs), have been added to the colloidal nanocrystal (NC) family. Through the unique control of the thickness with monolayer ...
    • Ultrahigh-efficiency aqueous flat nanocrystals of CdSe/CdS@Cd1−xZnxS colloidal core/crown@alloyed-shell quantum wells 

      Shendre, S.; Delikanlı, Savaş; Li, M.; Dede, Didem; Pan, Z.; Ha, S. T.; Fu, Y. H.; Hernández-Martínez, Pedro L.; Yu, J.; Erdem, Onur; Kuznetsov, A. I.; Dang, C.; Sum, T. C.; Demir, Hilmi Volkan (Royal Society of Chemistry, 2019)
      Colloidal semiconductor nanoplatelets (NPLs) are highly promising luminescent materials owing to their exceptionally narrow emission spectra. While high-efficiency NPLs in non-polar organic media can be obtained readily, ...
    • Ultrathin highly luminescent two-monolayer colloidal CdSe nanoplatelets 

      Delikanlı, Savaş; Yu, G.; Yeltik, Aydan; Bose, S.; Erdem, Talha; Yu, J.; Erdem, Onur; Sharma, Manoj; Sharma, Vijay Kumar; Quliyeva, Ulviyya; Shendre, S.; Dang, C.; Zhang, D.; Sum, T.; Fan, W.; Demir, Hilmi Volkan (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2019)
      Surface effects in atomically flat colloidal CdSe nanoplatelets (NLPs) are significantly and increasingly important with their thickness being reduced to subnanometer level, generating strong surface related deep trap ...
    • Understanding the journey of dopant copper ions in atomically flat colloidal nanocrystals of CdSe nanoplatelets using partial cation exchange reactions 

      Sharma, Manoj; Olutaş, Murat; Yeltik, Aydan; Kelestemur, Yusuf; Sharma, Ashma; Delikanlı, Savaş; Güzeltürk, Burak; Güngör, Kıvanç; McBride, J. R.; Demir, Hilmi Volkan (American Chemical Society, 2018)
      Unique electronic and optical properties of doped semiconductor nanocrystals (NCs) have widely stimulated a great deal of interest to explore new effective synthesis routes to achieve controlled doping for highly efficient ...