Journal
APPLIED PHYSICS LETTERS
Volume 108, Issue 24, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4953840
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Funding
- EU-FP7 Nanophotonics4Energy NoE
- TUBITAK EEEAG [109E002, 109E004, 110E010, 110E217, 112E183]
- A*STAR of Singapore
- ESF-EURYI
- TUBA-GEBIP
- NSF [DMR 1305770]
- [NRF-RF-2009-09]
- [NRF-CRP-6-2010-02]
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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. Published by AIP Publishing.
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