Stacking in colloidal nanoplatelets : tuning excitonic properties

dc.authorid0000-0003-1793-112Xen_US
dc.authorid0000-0003-1616-2728en_US
dc.authorid0000-0003-2212-965Xen_US
dc.authorid0000-0003-1977-6485
dc.contributor.authorGüzeltürk, Burak
dc.contributor.authorErdem, Onur
dc.contributor.authorOlutaş, Murat
dc.contributor.authorKelestemur, Yusuf
dc.contributor.authorDemir, Hilmi Volkan
dc.date.accessioned2021-06-23T19:35:14Z
dc.date.available2021-06-23T19:35:14Z
dc.date.issued2014
dc.departmentBAİBÜ, Fen Edebiyat Fakültesi, Fizik Bölümüen_US
dc.description.abstractColloidal semiconductor quantum wells, also commonly known as nanoplatelets (NPLs), have arisen among the most promising materials for light generation and harvesting applications. Recently, NPLs have been found to assemble in stacks. However, their emerging characteristics essential to these applications have not been previously controlled or understood. In this report, we systematically investigate and present excitonic properties of controlled column-like NPL assemblies. Here, by a controlled gradual process, we show that stacking in colloidal quantum wells substantially increases exciton transfer and trapping. As NPLs form into stacks, surprisingly we find an order of magnitude decrease in their photoluminescence quantum yield, while the transient fluorescence decay is considerably accelerated. These observations are corroborated by ultraefficient Forster resonance energy transfer (FRET) in the stacked NPLs, in which exciton migration is estimated to be in the ultralong range (>100 nm). Homo-FRET (i.e., FRET among the same emitters) is found to be ultraefficient, reaching levels as high as 99.9% at room temperature owing to the close-packed collinear orientation of the NPLs along with their large extinction coefficient and small Stokes shift, resulting in a large Forster radius of similar to 13.5 nm. Consequently, the strong and long-range homo-FRET boosts exciton trapping in nonemissive NPLs, acting as exciton sink centers, quenching photoluminescence from the stacked NPLs due to rapid nonradiative recombination of the trapped excitons. The rate-equation-based model, which considers the exciton transfer and the radiative and nonradiative recombination within the stacks, shows an excellent match with the experimental data. These results show the critical significance of stacking control in NPL solids, which exhibit completely different signatures of homo-FRET as compared to that in colloidal nanocrystals due to the absence of inhomogeneous broadening.en_US
dc.identifier.doi10.1021/nn5053734
dc.identifier.endpage12533en_US
dc.identifier.issn1936-0851
dc.identifier.issn1936-086X
dc.identifier.issue12en_US
dc.identifier.pmid25469555en_US
dc.identifier.scopus2-s2.0-84919775414en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.startpage12524en_US
dc.identifier.urihttps://doi.org/10.1021/nn5053734
dc.identifier.urihttps://hdl.handle.net/20.500.12491/7743
dc.identifier.volume8en_US
dc.identifier.wosWOS:000347138000065en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.indekslendigikaynakPubMeden_US
dc.institutionauthorOlutaş, Murat
dc.language.isoenen_US
dc.publisherAmer Chemical Socen_US
dc.relation.ispartofAcs Nanoen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectColloidal Quantum Wellsen_US
dc.subjectColloidal Nanoplateletsen_US
dc.subjectNonradiative Energy Transferen_US
dc.subjectForster Resonance Energy Transferen_US
dc.subjectTime-Resolved Fluorescence Spectroscopyen_US
dc.subjectExciton Trappingen_US
dc.titleStacking in colloidal nanoplatelets : tuning excitonic propertiesen_US
dc.typeArticleen_US

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