Lateral size-dependent spontaneous and stimulated emission properties in colloidal CdSe nanoplatelets

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dc.authorid0000-0003-1616-2728en_US
dc.authorid0000-0002-6250-6977en_US
dc.authorid0000-0001-6976-4680
dc.authorid0000-0002-0613-8014
dc.contributor.authorOlutaş, Murat
dc.contributor.authorGüzeltürk, Burak
dc.contributor.authorKeleştemur, Yusuf
dc.contributor.authorYeltik, Aydan
dc.contributor.authorDelikanlı Savaş
dc.date.accessioned2021-06-23T19:42:06Z
dc.date.available2021-06-23T19:42:06Z
dc.date.issued2015
dc.departmentBAİBÜ, Fen Edebiyat Fakültesi, Fizik Bölümüen_US
dc.description.abstractHere, we systematically investigated the spontaneous and stimulated emission performances of solution-processed atomically flat quasi-2D nanoplatelets (NPLs) as a function of their lateral size using colloidal CdSe core NPLs. We found that the photoluminescence quantum efficiency of these NPLs decreases with increasing lateral size while their photoluminescence decay rate accelerates. This strongly suggests that nonradiative channels prevail in the NPL ensembles having extended lateral size, which is well-explained by the increasing number of the defected NPL subpopulation. In the case of stimulated emission the role of lateral size in NPLs influentially emerges both in the single- and two-photon absorption (1PA and 2PA) pumping. In the amplified spontaneous emission measurements, we uncovered that the stimulated emission thresholds of 1PA and 2PA exhibit completely opposite behavior with increasing lateral size. The NPLs with larger lateral sizes exhibited higher stimulated emission thresholds under 1PA pumping due to the dominating defected subpopulation in larger NPLs. On the other hand, surprisingly, larger NPLs remarkably revealed lower 2PA-pumped amplified spontaneous emission thresholds. This is attributed to the observation of a "giant" 2PA cross-section overwhelmingly growing with increasing lateral size and reaching record levels higher than 10(6) GM, at least an order of magnitude stronger than colloidal quantum dots and rods. These findings suggest that the lateral size control in the NPLs, which is commonly neglected, is essential to high-performance colloidal NPL optoelectronic devices in addition to the vertical monolayer control.en_US
dc.identifier.doi10.1021/acsnano.5b01927
dc.identifier.endpage5050en_US
dc.identifier.issn1936-0851
dc.identifier.issn1936-086X
dc.identifier.issue5en_US
dc.identifier.pmid25950419en_US
dc.identifier.scopus2-s2.0-84930679068en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.startpage5041en_US
dc.identifier.urihttps://doi.org/10.1021/acsnano.5b01927
dc.identifier.urihttps://hdl.handle.net/20.500.12491/8345
dc.identifier.volume9en_US
dc.identifier.wosWOS:000355383000040en_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.subjectSemiconductor Nanoplateletsen_US
dc.subjectColloidal Quantum Wellsen_US
dc.subjectLateral Sizeen_US
dc.subjectPhotoluminescence Quantum Efficiencyen_US
dc.subjectAmplified Spontaneous Emissionen_US
dc.subjectStimulated Emissionen_US
dc.subjectGant Two-Photon Absorption Cross-Sectionen_US
dc.titleLateral size-dependent spontaneous and stimulated emission properties in colloidal CdSe nanoplateletsen_US
dc.typeArticleen_US

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