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Addressing the exciton fine structure in colloidal nanocrystals: the case of CdSe nanoplatelets

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Abstract

We study the band-edge exciton fine structure and in particular its bright-dark splitting in colloidal semiconductor nanocrystals by four different optical methods based on fluorescence line narrowing and time-resolved measurements at various temperatures down to 2 K. We demonstrate that all these methods provide consistent splitting values and discuss their advances and limitations. Colloidal CdSe nanoplatelets with thicknesses of 3, 4 and 5 monolayers are chosen for experimental demonstrations. The bright-dark splitting of excitons varies from 3.2 to 6.0 meV and is inversely proportional to the nanoplatelet thickness. Good agreement between experimental and theoretically calculated size dependence of the bright-dark exciton splitting is achieved. The recombination rates of the bright and dark excitons and the bright to dark relaxation rate are measured by time-resolved techniques.

Graphical abstract: Addressing the exciton fine structure in colloidal nanocrystals: the case of CdSe nanoplatelets

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Publication details

The article was received on 27 Sep 2017, accepted on 03 Dec 2017 and first published on 04 Dec 2017


Article type: Paper
DOI: 10.1039/C7NR07206F
Citation: Nanoscale, 2018, Advance Article
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    Addressing the exciton fine structure in colloidal nanocrystals: the case of CdSe nanoplatelets

    E. V. Shornikova, L. Biadala, D. R. Yakovlev, V. F. Sapega, Y. G. Kusrayev, A. A. Mitioglu, M. V. Ballottin, P. C. M. Christianen, V. V. Belykh, M. V. Kochiev, N. N. Sibeldin, A. A. Golovatenko, A. V. Rodina, N. A. Gippius, A. Kuntzmann, Y. Jiang, M. Nasilowski, B. Dubertret and M. Bayer, Nanoscale, 2018, Advance Article , DOI: 10.1039/C7NR07206F

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