Browsing by Author "Güngör, Kıvanç"
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Colloidal photonics of semiconductor nanocrystals: from polarized color conversion to efficient solar concentration
Güngör, Kıvanç (Bilkent University, 2018-07)Effective photon management is pivotal to the success of future photonic applications. The demand for high-performance electronic displays and solar light harvesters has been increasingly growing, ever with high expectations ... -
Giant alloyed hot injection shells enable ultralow optical gain threshold in colloidal quantum wells
Altıntaş, Yemliha; Güngör, Kıvanç; Gao, Y.; Sak, Mustafa; Quliyeva, Ulviyya; Bappi, G.; Mutlugün, Evren; Sargent, E. H.; Demir, Hilmi Volkan (American Chemical Society, 2019)As an attractive materials system for high-performance optoelectronics, colloidal nanoplatelets (NPLs) benefit from atomic-level precision in thickness, minimizing emission inhomogeneous broadening. Much progress has been ... -
Highly stable multicrown heterostructures of type-II nanoplatelets for ultralow threshold optical gain
Dede, Didem; Taghipour, Nima; Quliyeva, Ulviyya; Sak, Mustafa; Kelestemur, Yusuf; Güngör, Kıvanç; Demir, Hilmi Volkan (American Chemical Society, 2019)Solution-processed type-II quantum wells exhibit outstanding optical properties, which make them promising candidates for light-generating applications including lasers and LEDs. However, they may suffer from poor colloidal ... -
Highly stable, near-unity efficiency atomically flat semiconductor nanocrystals of CdSe/ZnS hetero-nanoplatelets enabled by ZnS-Shell hot-injection growth
Yemliha, Yemliha; Quliyeva, Ulviyya; Güngör, Kıvanç; Erdem, Onur; Kelestemur, Yusuf; Mutlugün, Evren; Kovalenko, M.; Demir, Hilmi Volkan (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2019)Colloidal semiconductor nanoplatelets (NPLs) offer important benefits in nanocrystal optoelectronics with their unique excitonic properties. For NPLs, colloidal atomic layer deposition (c‐ALD) provides the ability to produce ... -
Nanoplasmonic three-dimensional surfaces with strong surface-normal electric field enhancement
Güngör, Kıvanç; Ünal, Emre; Demir, Hilmi Volkan (IEEE, 2013)Conventional plasmonic structures provide field enhancement in the plane. The proposed nanoplasmonic three-dimensional surfaces, with unity coverage in the plan-view, enable surface-normal enhancement and achieve 7.2-fold ... -
Near-Infrared-Emitting five-monolayer thick copper-doped CdSe nanoplatelets
Sharma, Ashma; Sharma, Manoj; Güngör, Kıvanç; Olutaş, Murat; Dede, Didem; Demir, Hilmi Volkan (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2019)Doped nanocrystals are instrumental to the high‐performance luminescent solar concentrators (LSCs) and the color conversion devices. Recently, copper (Cu)‐doped three and four monolayer (ML) thick CdSe nanoplatelets (NPLs) ... -
Orientation-controlled nonradiative energy transfer to colloidal nanoplatelets: engineering dipole orientation factor
Erdem, Onur; Güngör, Kıvanç; Güzeltürk, Burak; Tanrıöver, İbrahim; Sak, Mustafa; Olutaş, Murat; Dede, Didem; Kelestemur, Yusuf; Demir, Hilmi Volkan (American Chemical Society, 2019)We proposed and showed strongly orientation-controlled Förster resonance energy transfer (FRET) to highly anisotropic CdSe nanoplatelets (NPLs). For this purpose, we developed a liquid–air interface self-assembly technique ... -
Plasmonic nanoparticle enhanced and extended performance of light-sensitive nanocrystal skins
Akhavan, Shahab; Güngör, Kıvanç; Demir, Hilmi Volkan (Materials Research Society, 2013)We report on light-sensitive nanocrystal skin (LS-NS) platforms composed of monolayer visible nanocrystals (NCs) on top of bilayers of polyelectrolyte polymers. These LS-NS devices are operated on the principle of ... -
Three dimensional nanoplasmonic surfaces : modeling, fabrication and characterization
Güngör, Kıvanç (Bilkent University, 2013)Today designing functional nanoplasmonic structures specific to a variety of applications attracts great interest from various fields ranging from optoelectronics to life sciences. There are numerous ways of making na ... -
Three-dimensional nanoplasmonic surfaces with strong out-of-plane electric field enhancement
Güngör, Kıvanç; Ünal, Emre; Demir, Hilmi Volkan (IEEE, 2013)Conventional 2D plasmonic structures, with surface coverage ~50%, provide field enhancement in the plane. The proposed 3D nanoplasmonic surfaces, with unity coverage, achieve 7.2-fold stronger out-of-plane enhancement ... -
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 ... -
Universality of dissipative self-assembly from quantum dots to human cells
Makey, Ghaith; Galioğlu, Sezin; Ghaffari, Roujin; Engin, E. D.; Yıldırım, Gökhan; Yavuz, Özgün; Bektaş, O.; Nizam, Ü. S.; Akbulut, Özge; Şahin, Özgür; Güngör, Kıvanç; Dede, Didem; Demir, Hilmi Volkan; İlday, Fatih Ömer; İlday, Serim (Nature Research, 2020)An important goal of self-assembly research is to develop a general methodology applicable to almost any material, from the smallest to the largest scales, whereby qualitatively identical results are obtained independently ...