Alloyed heterostructures of CdSexS1-x nanoplatelets with highly tunable optical gain performance

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buir.contributor.authorDemir, Hilmi Volkan
buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112X
dc.citation.epage4865en_US
dc.citation.issueNumber11en_US
dc.citation.spage4857en_US
dc.citation.volumeNumber29en_US
dc.contributor.authorKelestemur Y.en_US
dc.contributor.authorDede, D.en_US
dc.contributor.authorGungor K.en_US
dc.contributor.authorUsanmaz, C. F.en_US
dc.contributor.authorErdem, O.en_US
dc.contributor.authorDemir, Hilmi Volkanen_US
dc.date.accessioned2018-04-12T11:09:27Z
dc.date.available2018-04-12T11:09:27Z
dc.date.issued2017en_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentDepartment of Physicsen_US
dc.description.abstractHere, we designed and synthesized alloyed heterostructures of CdSexS1-x nanoplatelets (NPLs) using CdS coating in the lateral and vertical directions for the achievement of highly tunable optical gain performance. By using homogeneously alloyed CdSexS1-x core NPLs as a seed, we prepared CdSexS1-x/CdS core/crown NPLs, where CdS crown region is extended only in the lateral direction. With the sidewall passivation around inner CdSexS1-x cores, we achieved enhanced photoluminescence quantum yield (PL-QY) (reaching 60%), together with increased absorption cross-section and improved stability without changing the emission spectrum of CdSexS1-x alloyed core NPLs. In addition, we further extended the spectral tunability of these solution-processed NPLs with the synthesis of CdSexS1-x/CdS core/shell NPLs. Depending on the sulfur composition of the CdSexS1-x core and thickness of the CdS shell, CdSexS1-x/CdS core/shell NPLs possessed highly tunable emission characteristics within the spectral range of 560-650 nm. Finally, we studied the optical gain performances of different heterostructures of CdSexS1-x alloyed NPLs offering great advantages, including reduced reabsorption and spectrally tunable optical gain range. Despite their decreased PL-QY and reduced absorption cross-section upon increasing the sulfur composition, CdSexS1-x based NPLs exhibit highly tunable amplified spontaneous emission performance together with low gain thresholds down to ∼53 μJ/cm2.en_US
dc.description.provenanceMade available in DSpace on 2018-04-12T11:09:27Z (GMT). No. of bitstreams: 1 bilkent-research-paper.pdf: 179475 bytes, checksum: ea0bedeb05ac9ccfb983c327e155f0c2 (MD5) Previous issue date: 2017en
dc.identifier.doi10.1021/acs.chemmater.7b00829en_US
dc.identifier.issn0897-4756
dc.identifier.urihttp://hdl.handle.net/11693/37305
dc.language.isoEnglishen_US
dc.publisherAmerican Chemical Societyen_US
dc.relation.isversionofhttp://dx.doi.org/10.1021/acs.chemmater.7b00829en_US
dc.source.titleChemistry of Materialsen_US
dc.subjectAbsorption spectroscopyen_US
dc.subjectCadmium sulfideen_US
dc.subjectEmission spectroscopyen_US
dc.subjectSulfuren_US
dc.subjectAbsorption cross sectionsen_US
dc.subjectAmplified spontaneous emissionsen_US
dc.subjectEmission spectrumsen_US
dc.subjectPhotoluminescence quantum yieldsen_US
dc.subjectSidewall passivationen_US
dc.subjectSpectral tunabilityen_US
dc.subjectSpectrally tunableen_US
dc.subjectVertical directionen_US
dc.subjectOptical gainen_US
dc.titleAlloyed heterostructures of CdSexS1-x nanoplatelets with highly tunable optical gain performanceen_US
dc.typeArticleen_US

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Institute of Materials Science and Nanotechnology (UNAM)
Department of Electrical and Electronics Engineering
Department of Physics