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

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dc.citation.volumeNumber10114en_US
dc.contributor.authorMurphy, J. R.en_US
dc.contributor.authorDelikanlı, Savaşen_US
dc.contributor.authorZhang, T.en_US
dc.contributor.authorScrace, T. A.en_US
dc.contributor.authorZhang, P.en_US
dc.contributor.authorNorden, T.en_US
dc.contributor.authorThomay, T.en_US
dc.contributor.authorCartwright, A. N.en_US
dc.contributor.authorDemir, Himli Volkanen_US
dc.contributor.authorPetrou, A.en_US
dc.coverage.spatialSan Francisco, California, United Statesen_US
dc.date.accessioned2018-04-12T11:44:06Z
dc.date.available2018-04-12T11:44:06Z
dc.date.issued2017en_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.departmentDepartment of Physicsen_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.descriptionConference name:Proceedings of SPIE, Quantum Dots and Nanostructures: Growth, Characterization, and Modeling XIVen_US
dc.descriptionDate of Conference: 30–31 January 2017en_US
dc.description.abstractColloidal semiconductor nanoplatelets (NPLs) are quasi 2D-nanostructures that are grown and processed inexpensively using a solution based method and thus have recently attracted considerable attention. We observe two features in the photoluminescence spectrum, suggesting two possible recombination channels. Their intensity ratio varies with temperature and two distinct temperature regions are identified; a low temperature region (10K < T < 90K) and a high temperature region (90K < T < 200K). This ratio increases with increasing temperature, suggesting that one recombination channel involves holes that are weakly localized with a localization energy of 0.043meV. A possible origin of these localized states are energy-variations in the xy-plane of the nanoplatelet. The presence of positive photoluminescence circular polarization in the magnetically-doped core/multi-shell NPLs indicates a hole-dopant exchange interaction and therefore the incorporated magnetic Manganese ions act as a marker that determines the location of the localized hole states.1 Time-resolved measurements show two distinct timescales (τfast and τslow) that can be modeled using a rate equation model. We identify these timescales as closely related to the corresponding recombination times for the channels. The stronger hole localization of one of these channels leads to a decreased electron-hole wave function overlap and thus a decreased oscillator strength and an increased lifetime. We show that we can model and understand the magnetic interaction of doped 2D-colloidal nanoplatelets which opens a pathway to solution processable spin controllable light sources. Copyright © 2017 SPIE.en_US
dc.identifier.doi10.1117/12.2252266en_US
dc.identifier.issn0277-786X
dc.identifier.urihttp://hdl.handle.net/11693/37565
dc.language.isoEnglishen_US
dc.publisherSPIEen_US
dc.relation.isversionofhttps://doi.org/10.1117/12.2252266en_US
dc.source.titleProceedings of SPIEen_US
dc.subjectDoping (additives)en_US
dc.subjectLight sourcesen_US
dc.subjectNanocrystalsen_US
dc.subjectNanostructuresen_US
dc.subjectPhotoluminescenceen_US
dc.subjectPhotoluminescence spectroscopyen_US
dc.subjectSemiconductor quantum dotsen_US
dc.subjectTemperatureen_US
dc.subjectWave functionsen_US
dc.subjectColloidal semiconductorsen_US
dc.subjectIncreasing temperaturesen_US
dc.subjectLow temperature regionsen_US
dc.subjectMagnetic interactionsen_US
dc.subjectPhotoluminescence spectrumen_US
dc.subjectRecombination channelsen_US
dc.subjectTime resolved measurementen_US
dc.subjectTime-resolved photoluminescenceen_US
dc.subjectMagnetismen_US
dc.titleTime resolved photoluminescence study of magnetic CdSe/CdMnS/CdS core/multi-shell nanoplateletsen_US
dc.typeConference Paperen_US
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Institute of Materials Science and Nanotechnology (UNAM)
Department of Electrical and Electronics Engineering
Department of Physics