Ultrathin highly luminescent two-monolayer colloidal CdSe nanoplatelets

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buir.contributor.authorDelikanlı, Savaş
buir.contributor.authorYeltik, Aydan
buir.contributor.authorErdem, Talha
buir.contributor.authorErdem, Onur
buir.contributor.authorSharma, Manoj
buir.contributor.authorSharma, Vijay Kumar
buir.contributor.authorQuliyeva, Ulviyya
buir.contributor.authorDemir, Hilmi Volkan
buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112X
dc.citation.epage1901028-9en_US
dc.citation.issueNumber35en_US
dc.citation.spage1901028-1en_US
dc.citation.volumeNumber29en_US
dc.contributor.authorDelikanlı, Savaşen_US
dc.contributor.authorYu, G.en_US
dc.contributor.authorYeltik, Aydanen_US
dc.contributor.authorBose, S.en_US
dc.contributor.authorErdem, Talhaen_US
dc.contributor.authorYu, J.en_US
dc.contributor.authorErdem, Onuren_US
dc.contributor.authorSharma, Manojen_US
dc.contributor.authorSharma, Vijay Kumaren_US
dc.contributor.authorQuliyeva, Ulviyyaen_US
dc.contributor.authorShendre, S.en_US
dc.contributor.authorDang, C.en_US
dc.contributor.authorZhang, D.en_US
dc.contributor.authorSum, T.en_US
dc.contributor.authorFan, W.en_US
dc.contributor.authorDemir, Hilmi Volkanen_US
dc.date.accessioned2020-02-10T05:51:13Z
dc.date.available2020-02-10T05:51:13Z
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.abstractSurface effects in atomically flat colloidal CdSe nanoplatelets (NLPs) are significantly and increasingly important with their thickness being reduced to subnanometer level, generating strong surface related deep trap photoluminescence emission alongside the bandedge emission. Herein, colloidal synthesis of highly luminescent two‐monolayer (2ML) CdSe NPLs and a systematic investigation of carrier dynamics in these NPLs exhibiting broad photoluminescence emission covering the visible region with quantum yields reaching 90% in solution and 85% in a polymer matrix is shown. The astonishingly efficient Stokes‐shifted broadband photoluminescence (PL) emission with a lifetime of ≈100 ns and the extremely short PL lifetime of around 0.16 ns at the bandedge signify the participation of radiative midgap surface centers in the recombination process associated with the underpassivated Se sites. Also, a proof‐of‐concept hybrid LED employing 2ML CdSe NPLs is developed as color converters, which exhibits luminous efficacy reaching 300 lm Wopt−1. The intrinsic absorption of the 2ML CdSe NPLs (≈2.15 × 106 cm−1) reported in this study is significantly larger than that of CdSe quantum dots (≈2.8 × 105 cm−1) at their first exciton signifying the presence of giant oscillator strength and hence making them favorable candidates for next‐generation light‐emitting and light‐harvesting applications.en_US
dc.description.sponsorshipNational Research Foundation Singapore. Grant Number: NRF‐NRFI2016‐08en_US
dc.description.sponsorshipA*STAR. Grant Number: 152 73 00025en_US
dc.description.sponsorshipMOE. Grant Numbers: RG 173/16, MOE2016‐T2‐1‐034, MOE‐RG178/17en_US
dc.description.sponsorshipSingapore National Research Foundation. Grant Numbers: NRF‐CRP14‐2014‐03, MOE‐RG178/17en_US
dc.description.sponsorshipChina Postdoctoral Science Foundation. Grant Number: 2017M620385en_US
dc.embargo.release2020-08-28
dc.identifier.doi10.1002/adfm.201901028en_US
dc.identifier.issn1616-301X
dc.identifier.urihttp://hdl.handle.net/11693/53199
dc.language.isoEnglishen_US
dc.publisherWILEY-VCH Verlag GmbH & Co. KGaA, Weinheimen_US
dc.relation.isversionofhttps://doi.org/10.1002/adfm.201901028en_US
dc.source.titleAdvanced Functional Materialsen_US
dc.subjectCdSe nanoplateletsen_US
dc.subjectColloidalen_US
dc.subjectGiant oscillator strengthen_US
dc.subjectHigh quantum yielden_US
dc.subjectUltrathinen_US
dc.titleUltrathin highly luminescent two-monolayer colloidal CdSe nanoplateletsen_US
dc.typeArticleen_US

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Department of Electrical and Electronics Engineering
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