Time-resolved photoluminescence study of CdSe/CdMnS/CdS core/multi-shell nanoplatelets

Journal Article · Mon Jun 13 04:00:00 EDT 2016 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4953840· OSTI ID:22590790

Murphy, J. R. ^[1]; Delikanli, S.; Scrace, T.; Zhang, P.; Norden, T.; Thomay, T.; Cartwright, A. N. ^[1]

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1. Department of Electrical Engineering, State University of New York, University at Buffalo, Buffalo, New York 14260 (United States)

We used photoluminescence spectroscopy to resolve two emission features in CdSe/CdMnS/CdS and CdSe/CdS core/multi-shell nanoplatelet heterostructures. The photoluminescence from the magnetic sample has a positive circular polarization with a maximum centered at the position of the lower energy feature. The higher energy feature has a corresponding signature in the absorption spectrum; this is not the case for the low-energy feature. We have also studied the temporal evolution of these features using a pulsed-excitation/time-resolved photoluminescence technique to investigate their corresponding recombination channels. A model was used to analyze the temporal dynamics of the photoluminescence which yielded two distinct timescales associated with these recombination channels. The above results indicate that the low-energy feature is associated with recombination of electrons with holes localized at the core/shell interfaces; the high-energy feature, on the other hand, is excitonic in nature with the holes confined within the CdSe cores.

• OSTI ID: 22590790
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 24 Vol. 108; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION SPECTRA
CADMIUM SELENIDES
CADMIUM SULFIDES
INTERFACES
NANOSTRUCTURES
PHOTOLUMINESCENCE
POLARIZATION
PULSES
RECOMBINATION
SPECTROSCOPY
TIME RESOLUTION