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dc.contributor.authorOlutaş, M.en_US
dc.contributor.authorGüzeltürk, B.en_US
dc.contributor.authorKeleştemur, Y.en_US
dc.contributor.authorYeltik A.en_US
dc.contributor.authorDelikanlı, S.en_US
dc.contributor.authorDemir, Hilmi Volkanen_US
dc.date.accessioned2015-07-28T12:03:33Z
dc.date.available2015-07-28T12:03:33Z
dc.date.issued2015en_US
dc.identifier.issn1936-0851
dc.identifier.urihttp://hdl.handle.net/11693/12865
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.language.isoEnglishen_US
dc.source.titleACS Nanoen_US
dc.relation.isversionofhttp://dx.doi.org/10.1021/acsnano.5b01927en_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.subjectGiant Two - photon Absorption Cross - sectionen_US
dc.titleLateral size-dependent spontaneous and stimulated emission properties in colloidal CdSe nanoplateletsen_US
dc.typeArticleen_US
dc.departmentDepartment of Physicsen_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.citation.spage5041en_US
dc.citation.epage5050en_US
dc.citation.volumeNumber9en_US
dc.citation.issueNumber5en_US
dc.identifier.doi10.1021/acsnano.5b01927en_US
dc.publisherAmerican Chemical Societyen_US
dc.contributor.bilkentauthorDemir, Hilmi Volkan
buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112Xen_US


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