21 April 2016 Aggregation of quantum dots in hybrid structures based on TiO2 nanoparticles
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A morphology and photoinduced changes of luminescence properties of two types of hybrid structures based on TiO2 nanoparticles and CdSe/ZnS QDs were examined. A spin-coating method and a modified Langmuir- Blodgett technique have been applied to form the multilayer hybrid structures on glass slides. It was demonstrated that uniformity of QD surface concentration in hybrid structures depends on the method of structure formation. A photodegradation of luminescence properties of the structures is associated with the formation of QD aggregates. The QD aggregate concentration and their size depend on the method of the structure formation and the concentration of TiO2 nanoparticles. A decay of luminescence of QD aggregates in hybrid structures contains a microsecond components. An exposure of the hybrid structures with uniform QD surface concentration by visible light resulted in a photopassivation of their surface, which is accompanied by significant increase of luminescence quantum yield of QDs.
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Ekaterina P. Kolesova, Ekaterina P. Kolesova, Anna O. Orlova, Anna O. Orlova, Vladimir G. Maslov, Vladimir G. Maslov, Yurii K. Gun'ko, Yurii K. Gun'ko, Olan Cleary, Olan Cleary, Aleksander V. Baranov, Aleksander V. Baranov, Anatoly V. Fedorov, Anatoly V. Fedorov, } "Aggregation of quantum dots in hybrid structures based on TiO2 nanoparticles", Proc. SPIE 9884, Nanophotonics VI, 988431 (21 April 2016); doi: 10.1117/12.2227636; https://doi.org/10.1117/12.2227636

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