Ms. Darya V. Dyagileva Profile

Darya V. Dyagileva

at National Research Nuclear Univ MEPhI

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Publications (2)

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Proceedings Article | 1 April 2020 Presentation + Paper

Long-range coupling of individual quantum dots with plasmonic nanoparticles in a thin-film hybrid material

Daria Dyagileva, Victor Krivenkov, Pavel Samokhvalov, Igor Nabiev, Yury Rakovich

Proceedings Volume 11345, 113451D (2020) https://doi.org/10.1117/12.2556669

KEYWORDS: Thin films, Silver, Plasmons, Polymethylmethacrylate, Nanoparticles, Gold, Quantum dots, Plasmonics, Refractive index, Luminescence

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Semiconductor quantum dots (QDs) are widely used in photovoltaic and optoelectronic devices due to their unique optical properties. Photoluminescence (PL) properties of QDs can be significantly improved by their electromagnetic coupling with plasmonic nanoparticles (PNPs). The excitation of resonant localized plasmon modes leads to the enhancement of the density of photon states and increase of electromagnetic field near the surface of PNPs, what boosts the acceleration of the exciton radiative decay, known as the Purcell effect. To study the dependence of the degree of acceleration of radiative decay rate (Purcell factor) on the distance between QDs and PNPs, we fabricated thin-film hybrid structures based on CdSe(core)/ZnS/CdS/ZnS(multishell) QDs and silver or gold PNPs with a controllable distance between these components. The change in the radiative decay rate of excitons was calculated from the PL intensities and lifetimes before and after the deposition of PNPs on top of the QD thin film covered by a poly(methyl methacrylate) (PMMA) spacer. For both PNP types, the PL lifetime of underlying QDs decreased, whereas the PL intensity of the latter decreased only slightly for gold PNPs and even increased for silver PNPs. This indicates the acceleration of QDs radiative decay (Purcell effect) mediated by exciton-plasmon interaction. The Purcell factor was higher for silver PNPs than that for gold PNPs, what can be explained by the better spectral overlap between the QDs PL band and silver PNPs absorbance and the absence of interband absorption in silver at the wavelength of QDs PL. The results of this study provide better understanding of the Purcell effects in hybrid materials based on QDs and PNPs.

Proceedings Article | 1 April 2020 Presentation + Paper

Absolute two-photon absorption cross-sections of single-exciton states in semiconductor nanocrystals

Victor Krivenkov, Pavel Samokhvalov, Daria Dyagileva, Igor Nabiev

Proceedings Volume 11345, 113451S (2020) https://doi.org/10.1117/12.2556259

KEYWORDS: Absorption, Luminescence, Photons, Excitons, Semiconductors, Nanocrystals, Physics, Quantum dots

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Semiconductor nanocrystals (SNCs), in particular, quantum dots (QDs) and nanoplatelets (NPLs), have orders of magnitude higher two-photon absorption cross-sections (TPACS) than organic dyes, what paves the way to their advanced applications in bioimaging, sensing, and optoelectronics. Traditionally, z-scan and two-photon photoluminescence (PL) excitation spectroscopy are used to determine the TPACS values. The main disadvantage of both methods is the necessity to know the exact sample concentration. In this study, we describe an approach to the TPACS determination from the analysis of two-photon-excited (TPE) PL saturation in CdSe(core)/ZnS/CdS/ZnS(multishell) QDs and CdSe NPLs. The results obtained for NPLs using developed approach are significantly smaller than those obtained by the z-scan method and are close to the values obtained for QDs. We assume that this discrepancy occurs due to the fact, that unlike the z-scan technique, the TPE PL saturation method measures the TPACS only for single-exciton states because of the low PL quantum yields of multiexciton states. Therefore, there is no need to know the concentration, which eliminates the corresponding estimation error. Thus, the measurement of TPE PL saturation in SNCs makes it possible to determine the absolute values of the TPACS of single-exciton states, which are more informative for applications of TPE PL than the TPACS of mixed multiexciton states.

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