Time-resolved photoluminescence study of CdSe/CdMnS/CdS core/multi-shell nanoplatelets
Author
Murphy, J. R.
Delikanli S.
Scrace, T.
Zhang, P.
Norden, T.
Thomay, T.
Cartwright, A. N.
Demir, Hilmi Volkan
Petrou, A.
Date
2016Source Title
Applied Physics Letters
Print ISSN
0003-6951
Publisher
American Institute of Physics Inc.
Volume
108
Issue
24
Pages
242406-1 - 242406-4
Language
English
Type
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Abstract
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.
Keywords
Absorption spectroscopyPhotoluminescence spectroscopy
Emission features
Magnetic samples
Nano-platelets
Pulsed excitation
Recombination channels
Temporal dynamics
Temporal evolution
Time-resolved photoluminescence
Photoluminescence