Optically detected magnetic resonance study of relaxation/emission processes in the nanoparticle-polymer composite

• Published in: Semiconductor Physics Quantum Electronics & Optoelectronics
• Date: 2019
• Main Authors: Rudko, G.Yu., Vorona, I.P., Dzhagan, V.M., Raevskaya, A.E., Stroyuk, O.L., Fediv, V.I., Kovalchuk, A.O., Stehr, Jan E., Chen, WeiMin M., Buyanova, I.A.
• Format: Article
• Language: English
• Published: Інститут фізики напівпровідників імені В.Є. Лашкарьова НАН України 2019
• Subjects: Hetero- and low-dimensional structures
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/215496
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Optically detected magnetic resonance study of relaxation/emission processes in the nanoparticle-polymer composite / G.Yu. Rudko, I.P. Vorona, V.M. Dzhagan, A.E. Raevskaya, O.L. Stroyuk, V.I. Fediv, A.O. Kovalchuk, Jan E. Stehr, WeiMin M. Chen, I.A. Buyanova // Semiconductor Physics Quantum Electronics & Optoelectronics. — 2019. — Т. 22, № 3. — С. 310-318. — Бібліогр.: 44 назв. — англ.

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 in 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.