Proceedings of Online nanoGe Fall Meeting 20 (OnlineNFM20)
Publication date: 4th October 2020
Nonradiative recombination channel of spin-forbidden dark excitons in colloidal 4 monolayer thick CdSe nanoplatelets synthesized in argon and ambient atmosphere is revealed by analysis of temperature and magnetic field dependencies of the time-resolved photoluminescence. Magneto-optical properties of these nanoplatelets were previously studied in the paper [1]. The nonradiative recombination time of the dark excitons τnr = 11 ns is found to be independent of the nanoplatelets synthesis atmosphere. Only a fraction of nanoplatelets contains the nonradiative recombination channel, while in the rest of nanoplatelets purely radiative recombination of dark excitons is observed. It is shown that the presence of a nonradiative recombination channel affects spin polarization of dark excitons and results in the time dependence of circular polarization degree of photoluminescence in the external magnetic field.
The work was supported by the Russian Science Foundation (Grant No. 20-42-01008) and the Deutsche Forschungsgemeinschaft through the International Collaborative Research Centre TRR160 (Project B1).
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