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The impact of prolonged irradiation of SPIONs/CdSe/ZnS nanocomposites by visible light on nanocomposite luminescence has been studied. It has been shown that prolonged irradiation of the nanocomposites with 405 nm laser can triple their photoluminescence quantum yield. It has been demonstrated that the efficiency of photoinduced processes on the nanocomposite surface correlates very well with the concentration of the nanocomposite surface ligand in our samples. We have also found that the quantum sized CdSe shell of SPIONs/CdSe/ZnS nanocomposites demonstrates the QD-like dependence of photoluminescence quantum yield on visible light dose and this nanocomposite property can be efficiently used to brighten their photoluminescence.
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Ivan A. Reznik, Anna Matiushkina, Alekey Dubavik, Anna O. Orlova, "Photoinduced change in SPIONs/CdSe/ZnS nanocomposites optical properties," Proc. SPIE 11345, Nanophotonics VIII, 113451E (13 April 2020); https://doi.org/10.1117/12.2556898