Yusuf Keleştemur

Department of Metallurgical and Materials Engineering
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Tattoo-Like Multi-Color Physically Unclonable Functions
KİREMİTLER, NURİ BURAK; Esidir, Abidin; Drake, Gryphon A.; YAZICI, AHMET FARUK; Sahin, Furkan; TÖRÜN, İLKER; Kalay, Mustafa; Keleştemur, Yusuf; Demir, Hilmi Volkan; Shim, Moonsub; Mutlugun, Evren; Onses, M. Serdar (2023-01-01)
Advanced anti-counterfeiting and authentication approaches are in urgent need of the rapidly digitizing society. Physically unclonable functions (PUFs) attract significant attention as a new-generation security primitive. ...
Light-Induced Paramagnetism in Colloidal Ag+-Doped CdSe Nanoplatelets
Najafi, Arman; Sharma, Manoj; Delikanli, Savas; Bhattacharya, Arinjoy; Murphy, Joseph R.; Pientka, James; Sharma, Ashma; Quinn, Alexander P.; Erdem, Onur; Kattel, Subash; Keleştemur, Yusuf; Kovalenko, Maksym; Rice, William D.; Demir, Hilmi Volkan; Petrou, Athos (2021-03-01)
We describe a study of the magneto-optical properties of Ag+-doped CdSe colloidal nanoplatelets (NPLs) that were grown using a novel doping technique. In this work, we used magnetic circularly polarized luminescence and ma...
Fast Neutron Imaging with Semiconductor Nanocrystal Scintillators
McCall, Kyle M.; Sakhatskyi, Kostiantyn; Lehmann, Eberhard; Walfort, Bernhard; Losko, Adrian S.; Montanarella, Federico; Bodnarchuk, Maryna; Krieg, Franziska; Keleştemur, Yusuf; Mannes, David; Shynkarenko, Yevhen; Yakunin, Sergii; Kovalenko, Maksym (2020-11-01)
Fast neutrons offer high penetration capabilities for both light and dense materials due to their comparatively low interaction cross sections, making them ideal for the imaging of large-scale objects such as large fossils...
Plasmon-enhanced fluorescence in gold nanorod-quantum dot coupled systems
Trotsiuk, Liudmila; Muravitskaya, Alina; Kulakovich, Olga; Guzatov, Dmitry; Ramanenka, Andrey; Keleştemur, Yusuf; Demir, Hilmi; Gaponenko, Sergey (2020-03-01)
Plasmon-exciton coupling is of great importance to many optical devices and applications. One of the coupling manifestations is plasmon-enhanced fluorescence. Although this effect is demonstrated in numerous experimental a...
Colloidal CdSe Quantum Wells with Graded Shell Composition for Low-Threshold Amplified Spontaneous Emission and Highly Efficient Electroluminescence
Keleştemur, Yusuf; Anni, Marco; Yakunin, Sergii; De Giorgi, Maria Luisa; Kovalenko, Maksym V. (2019-12-01)
Semiconductor nanoplatelets (NPLs) have emerged as a very promising class of colloidal nanocrystals for light-emitting devices owing to their quantum-well-like electronic and optical characteristics. However, their lower p...
Orientation-Controlled Nonradiative Energy Transfer to Colloidal Nanoplatelets: Engineering Dipole Orientation Factor
Erdem, Onur; Gungor, Kivanc; Guzelturk, Burak; Tanriover, Ibrahim; Sak, Mustafa; Olutas, Murat; Dede, Didem; Keleştemur, Yusuf; Demir, Hilmi Volkan (2019-07-01)
We proposed and showed strongly orientation-controlled Forster resonance energy transfer (FRET) to highly anisotropic CdSe nanoplatelets (NPLs). For this purpose, we developed a liquidair interface self-assembly technique ...
Highly Stable Multicrown Heterostructures of Type-II Nanoplatelets for Ultralow Threshold Optical Gain
Dede, Didem; Taghipour, Nima; Quliyeva, Ulviyya; Sak, Mustafa; Keleştemur, Yusuf; Gungor, Kivanc; Demir, Hilmi Volkan (2019-03-01)
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 colloida...
Highly Stable, Near-Unity Efficiency Atomically Flat Semiconductor Nanocrystals of CdSe/ZnS Hetero-Nanoplatelets Enabled by ZnS-Shell Hot-Injection Growth
Altintas, Yemliha; Quliyeva, Ulviyya; Gungor, Kivanc; Erdem, Onur; Keleştemur, Yusuf; Mutlugun, Evren; Kovalenko, Maksym V.; Demir, Hilmi Volkan (2019-02-01)
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 produ...
Understanding the Journey of Dopant Copper Ions in Atomically Flat Colloidal Nanocrystals of CdSe Nanoplatelets Using Partial Cation Exchange Reactions
Sharma, Manoj; Olutas, Murat; Yeltik, Aydan; Keleştemur, Yusuf; Sharma, Ashma; Delikanli, Savas; Guzelturk, Burak; Gungor, Kivanc; McBride, James R.; Demir, Hilmi Volkan (2018-05-01)
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...
Exciton Dynamics of Colloidal Semiconductor Quantum Well Stacks
Erdem, Onur; Guzelturk, Burak; Olutas, Murat; Keleştemur, Yusuf; Demir, Hilmi Volkan (2018-01-01)
Colloidal semiconductor nanoplatelets (NPLs) have recently emerged as a new class of colloidal nanocrystals. NPLs are quasi two-dimensional nanocrystals having atomically flat surfaces and have unique properties such as na...
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