Magnetic field dependence of the recombination times in CdSe/CdMnS core/shell nanaoplatelets

ORAL

Abstract

We have performed time resolved photoluminescence (PL) studies of colloidal nanoplatelets (NPL) at T = 5 K in the presence of a magnetic field B.  The NPLs consist of a CdSe core surrounded by a CdMnS shell.  The PL has one component  associated with exciton recombination (channel 1) and another with the recombination of electrons with holes localized at the CdSe/CdMnS interfaces (channel 2) [1].   The band edge emission time evolution is described by two time constants.  A shorter time τ1 associated with channel 1 which does not depend on B and  a longer time τ2  associated with channel 2.  The time τ2 for the  σ+  (σ- ) component increases (decreases) with magnetic field.  Furthermore, we observe the B dependence of the two slow times gets smaller at T = 10 K compared to T = 5 K. We have developed a model to interpret these results. [1] J.R. Murphy et al., Appl. Phys. Lett. 2016, 108, 242406

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Publication: J.R. Murphy et al., Appl. Phys. Lett. 2016, 108, 242406

Presenters

  • James M Pientka

    • St. Bonaventure University

Authors

  • James M Pientka

    • St. Bonaventure University

  • Arinjoy Bhattacharya

    • State Univ of NY - Buffalo

  • Peiyao Zhang

    • Nano-scale Science and Engineering Center (NSEC), 3112 Etcheverry Hall, University of California, Berkeley, California 94720, USA
    • University of California Berkeley
    • University of California at Berkeley

  • Savas Delikanli

    • Department of Electrical and Electronics Engineering, Department of Physics, UNAM – Institute of Materials Science and Nanotechnology, Bilkent University, Ankara 06800, Turkey

  • Furkan Isik

    • Department of Electrical and Electronics Engineering, Department of Physics, UNAM – Institute of Materials Science and Nanotechnology, Bilkent University, Ankara 06800, Turkey

  • Hilmi Volkan Demir

    • Department of Electrical and Electronics Engineering, Department of Physics, UNAM – Institute of Materials Science and Nanotechnology, Bilkent University, Ankara 06800, Turkey

  • Xiang Zhang

    • University of California, Berkeley

  • Athos Petrou

    • State Univ of NY - Buffalo