Semiconductor Physics, Quantum Electronics & Optoelectronics, 22 (3), P. 310-318 (2019).

Optically detected magnetic resonance study of relaxation/emission processes in the nanoparticle-polymer composite
G.Yu. Rudko1*, I.P. Vorona1, V.M. Dzhagan1,2, A.E. Raevskaya3, O.L. Stroyuk3, V.I. Fediv4, A.O. Kovalchuk1, Jan E. Stehr5, WeiMin M. Chen5, I.A. Buyanova5

1V. Lashkaryov Institute of Semiconductor Physics of National Academy of Sciences of Ukraine, 45, prospect Nauky, 03680 Kyiv, Ukraine
22Taras Shevchenko National University of Kyiv, 01601 Kyiv, Ukraine
3L. Pysarzhevsky Institute of Physical Chemistry, National Academy of Sciences of Ukraine, 31, prospect Nauky, 03680 Kyiv, Ukraine
4Bukovinian State Medical University, Department of Biophysics and Medical Informatics, 42, Kobylyanska Str., 58000 Chernivtsi, Ukraine
5Department of Physics, Chemistry and Biology, Linkoping University, SE-581 83, Linkoping, Sweden
*Corresponding author:

Abstract. Two nanocomposites containing CdS nanoparticles in polymeric matrices were studied using the photoluminescence (PL) and optically detected magnetic resonance (ODMR) methods. Due to equal sizes of NPs in the composites (~5 nm) but different matrices – the oxygen-containing polymer PVA (polyvinyl alcohol) and oxygen-free polymer PEI (polyethyleneimine) – differences of nanocomposites properties are predominantly caused by different interfacial conditions. ODMR spectra have revealed five types of centers related to the PL emission – four centers involved in radiative recombination and one center related to non-radiative recombination processes. The oxygen-related interfacial center in CdS/PVA (LK1-center) and sulfur vacancy center in CdS/PEI (Vs-center) were identified.

Keywords: CdS nanoparticles, polymer, composites, photoluminescence, optically detected magnetic resonance.

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