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Time-resolved photoluminescence study of CdSe/CdMnS/CdS core/multi-shell nanoplatelets
Authors
Cartwright A.N.
Delikanli S.
+7 more
Demir H.V.
Murphy J.R.
Norden T.
Petrou A.
Scrace T.
Thomay T.
Zhang P.
Publication date
1 January 2016
Publisher
'AIP Publishing'
Doi
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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. © 2016 Author(s)
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Last time updated on 17/04/2018