Ultrahigh-efficiency aqueous flat nanocrystals of CdSe/CdS@Cd1−xZnxS colloidal core/crown@alloyed-shell quantum wells

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buir.contributor.authorDelikanlı, Savaş
buir.contributor.authorDede, Didem
buir.contributor.authorHernández-Martínez, Pedro L.
buir.contributor.authorErdem, Onur
buir.contributor.authorDemir, Hilmi Volkan
buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112X
dc.citation.epage310en_US
dc.citation.issueNumber1en_US
dc.citation.spage301en_US
dc.citation.volumeNumber11en_US
dc.contributor.authorShendre, S.en_US
dc.contributor.authorDelikanlı, Savaşen_US
dc.contributor.authorLi, M.en_US
dc.contributor.authorDede, Didemen_US
dc.contributor.authorPan, Z.en_US
dc.contributor.authorHa, S. T.en_US
dc.contributor.authorFu, Y. H.en_US
dc.contributor.authorHernández-Martínez, Pedro L.en_US
dc.contributor.authorYu, J.en_US
dc.contributor.authorErdem, Onuren_US
dc.contributor.authorKuznetsov, A. I.en_US
dc.contributor.authorDang, C.en_US
dc.contributor.authorSum, T. C.en_US
dc.contributor.authorDemir, Hilmi Volkanen_US
dc.date.accessioned2020-02-14T14:04:55Z
dc.date.available2020-02-14T14:04:55Z
dc.date.issued2019
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentDepartment of Physicsen_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.description.abstractColloidal semiconductor nanoplatelets (NPLs) are highly promising luminescent materials owing to their exceptionally narrow emission spectra. While high-efficiency NPLs in non-polar organic media can be obtained readily, NPLs in aqueous media suffer from extremely low quantum yields (QYs), which completely undermines their potential, especially in biological applications. Here, we show high-efficiency water-soluble CdSe/CdS@Cd1−xZnxS core/crown@shell NPLs formed by layer-by-layer grown and composition-tuned gradient Cd1−xZnxS shells on CdSe/CdS core/crown seeds. Such control of shell composition with monolayer precision and effective peripheral crown passivation, together with the compact capping density of short 3-mercaptopropionic acid ligands, allow for QYs reaching 90% in water, accompanied by a significantly increased photoluminescence lifetime (∼35 ns), indicating the suppression of nonradiative channels in these NPLs. We also demonstrate the controlled attachment of these NPLs without stacking at the nanoscale by taking advantage of their 2D geometry and hydrophilicity. This is a significant step in achieving controlled assemblies and overcoming the stacking process, which otherwise undermines their film formation and performance in optoelectronic applications. Moreover, we show that the parallel orientation of such NPLs achieved by the controlled attachment enables directed emission perpendicular to the surface of the NPL films, which is highly advantageous for light extraction in light-emitting platforms..en_US
dc.description.provenanceSubmitted by Evrim Ergin (eergin@bilkent.edu.tr) on 2020-02-14T14:04:55Z No. of bitstreams: 1 Ultrahigh-efficiency_aqueous_flat_nanocrystals_of_CdSe_CdS_Cd1−xZnxS_colloidal_core_crown_alloyed-shell_quantum_wells.pdf: 1865142 bytes, checksum: 4ad350fd469f5551c00e51d95b4f99f0 (MD5)en
dc.description.provenanceMade available in DSpace on 2020-02-14T14:04:55Z (GMT). No. of bitstreams: 1 Ultrahigh-efficiency_aqueous_flat_nanocrystals_of_CdSe_CdS_Cd1−xZnxS_colloidal_core_crown_alloyed-shell_quantum_wells.pdf: 1865142 bytes, checksum: 4ad350fd469f5551c00e51d95b4f99f0 (MD5) Previous issue date: 2019en
dc.identifier.doi10.1039/c8nr07879cen_US
dc.identifier.issn2040-3364
dc.identifier.urihttp://hdl.handle.net/11693/53373
dc.language.isoEnglishen_US
dc.publisherRoyal Society of Chemistryen_US
dc.relation.isversionofhttps://dx.doi.org/10.1039/c8nr07879cen_US
dc.source.titleNanoscaleen_US
dc.titleUltrahigh-efficiency aqueous flat nanocrystals of CdSe/CdS@Cd1−xZnxS colloidal core/crown@alloyed-shell quantum wellsen_US
dc.typeArticleen_US

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