Temperature-dependent emission kinetics of colloidal semiconductor nanoplatelets strongly modified by stacking

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buir.contributor.authorDemir, Hilmi Volkan
buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112X
dc.citation.epage554en_US
dc.citation.issueNumber3en_US
dc.citation.spage548en_US
dc.citation.volumeNumber7en_US
dc.contributor.authorErdem, O.en_US
dc.contributor.authorOlutas M.en_US
dc.contributor.authorGuzelturk, B.en_US
dc.contributor.authorKelestemur Y.en_US
dc.contributor.authorDemir, Hilmi Volkanen_US
dc.date.accessioned2018-04-12T10:51:29Z
dc.date.available2018-04-12T10:51:29Z
dc.date.issued2016en_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.departmentDepartment of Physicsen_US
dc.description.abstractWe systematically studied temperature-dependent emission kinetics in solid films of solution-processed CdSe nanoplatelets (NPLs) that are either intentionally stacked or nonstacked. We observed that the steady-state photoluminescence (PL) intensity of nonstacked NPLs considerably increases with decreasing temperature, whereas there is only a slight increase in stacked NPLs. Furthermore, PL decay time of the stacked NPL ensemble is comparatively much shorter than that of the nonstacked NPLs, and this result is consistent at all temperatures. To account for these observations, we developed a probabilistic model that describes excitonic processes in a stack using Markov chains, and we found excellent agreement between the model and experimental results. These findings develop the insight that the competition between the radiative channels and energy transfer-assisted hole trapping leads to weakly temperature-dependent PL intensity in the case of the stacked NPL ensembles as compared to the nonstacked NPLs lacking strong energy transfer. This study shows that it is essential to account for the effect of NPL stacking to understand their resulting PL emission properties.en_US
dc.description.provenanceMade available in DSpace on 2018-04-12T10:51:29Z (GMT). No. of bitstreams: 1 bilkent-research-paper.pdf: 179475 bytes, checksum: ea0bedeb05ac9ccfb983c327e155f0c2 (MD5) Previous issue date: 2016en
dc.identifier.doi10.1021/acs.jpclett.5b02763en_US
dc.identifier.issn1948-7185
dc.identifier.urihttp://hdl.handle.net/11693/36736
dc.language.isoEnglishen_US
dc.publisherAmerican Chemical Societyen_US
dc.relation.isversionofhttp://dx.doi.org/10.1021/acs.jpclett.5b02763en_US
dc.source.titleJournal of Physical Chemistry Lettersen_US
dc.subjectMarkov processesen_US
dc.subjectColloidal semiconductorsen_US
dc.subjectKinetics in solidsen_US
dc.subjectNano-plateletsen_US
dc.subjectPhotoluminescence intensitiesen_US
dc.subjectProbabilistic modelingen_US
dc.subjectRadiative channelsen_US
dc.subjectSolution-processeden_US
dc.subjectTemperature dependenten_US
dc.subjectEnergy transferen_US
dc.titleTemperature-dependent emission kinetics of colloidal semiconductor nanoplatelets strongly modified by stackingen_US
dc.typeArticleen_US

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