High external quantum efficiency light-emitting diodes enabled by advanced heterostructures of type-ii nanoplatelets

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buir.contributor.authorDemir, Hilmi Volkan
buir.contributor.authorShabani, Farzan
buir.contributor.authorIşık, Furkan
buir.contributor.authorDelikanli, Savaş
buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112X
buir.contributor.orcidShabani, Farzan|0000-0003-2174-5960
buir.contributor.orcidIsik, Furkan|0000-0001-5881-5438
buir.contributor.orcidDelikanli, Savas|0000-0002-0613-8014
dc.citation.epage7644en_US
dc.citation.issueNumber8en_US
dc.citation.spage7636en_US
dc.citation.volumeNumber17en_US
dc.contributor.authorDurmusoglu, Emek G.
dc.contributor.authorHu, Sujuan
dc.contributor.authorHernandez-Martinez, Pedro Ludwig
dc.contributor.authorIzmir, Merve
dc.contributor.authorShabani,Farzan
dc.contributor.authorGuo, Min
dc.contributor.authorGao, Huayu
dc.contributor.authorIsik, Furkan
dc.contributor.authorDelikanli, Savas
dc.contributor.authorSharma, Vijay Kumar
dc.contributor.authorLiu, Baiquan
dc.contributor.authorDemir, Hilmi Volkan
dc.date.accessioned2023-04-28T14:24:48Z
dc.date.available2023-04-28T14:24:48Z
dc.date.issued2023-03-13
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 quantum wells (CQWs), also known as nanoplatelets (NPLs), are exciting material systems for numerous photonic applications, including lasers and light-emitting diodes (LEDs). Although many successful type-I NPL-LEDs with high device performance have been demonstrated, type-II NPLs are not fully exploited for LED applications, even with alloyed type-II NPLs with enhanced optical properties. Here, we present the development of CdSe/CdTe/CdSe core/crown/crown (multi-crowned) type-II NPLs and systematic investigation of their optical properties, including their comparison with the traditional core/crown counterparts. Unlike traditional type-II NPLs such as CdSe/CdTe, CdTe/CdSe, and CdSe/CdSexTe1–x core/crown heterostructures, here the proposed advanced heterostructure reaps the benefits of having two type-II transition channels, resulting in a high quantum yield (QY) of 83% and a long fluorescence lifetime of 73.3 ns. These type-II transitions were confirmed experimentally by optical measurements and theoretically using electron and hole wave function modeling. Computational study shows that the multi-crowned NPLs provide a better-distributed hole wave function along the CdTe crown, while the electron wave function is delocalized in the CdSe core and CdSe crown layers. As a proof-of-concept demonstration, NPL-LEDs based on these multi-crowned NPLs were designed and fabricated with a record high external quantum efficiency (EQE) of 7.83% among type-II NPL-LEDs. These findings are expected to induce advanced designs of NPL heterostructures to reach a fascinating level of performance, especially in LEDs and lasers.en_US
dc.description.provenanceSubmitted by Ezgi Uğurlu (ezgi.ugurlu@bilkent.edu.tr) on 2023-04-28T14:24:48Z No. of bitstreams: 1 High_external_quantum_efficiency_light-emitting_diodes_enabled_by_advanced_heterostructures_of_type-ii_nanoplatelets.pdf: 4105376 bytes, checksum: d22cf7e28440783d4d3914867d73e851 (MD5)en
dc.description.provenanceMade available in DSpace on 2023-04-28T14:24:48Z (GMT). No. of bitstreams: 1 High_external_quantum_efficiency_light-emitting_diodes_enabled_by_advanced_heterostructures_of_type-ii_nanoplatelets.pdf: 4105376 bytes, checksum: d22cf7e28440783d4d3914867d73e851 (MD5) Previous issue date: 2023-03-13en
dc.identifier/pmc/articles/PMC34564/
dc.identifier/pubmed/11465690
dc.identifier.doidoi.org/10.1021/acsnano.3c00046en_US
dc.identifier.eissn1936-086X
dc.identifier.issn1936-0851
dc.identifier.urihttp://hdl.handle.net/11693/112336
dc.language.isoEnglishen_US
dc.publisherAmerican Chemical Societyen_US
dc.relationinfo:eu-repo/semantics/altIdentifier/pmid/11465690
dc.relation.isversionofhttps://doi.org/10.1021/acsnano.3c00046en_US
dc.source.titleACS Nanoen_US
dc.subjectType-II nanoplateletsen_US
dc.subjectColloidal quantum wellsen_US
dc.subjectAdvanced heterostructuresen_US
dc.subjectLight-emitting diodesen_US
dc.subjectExternal quantum efficiencyen_US
dc.titleHigh external quantum efficiency light-emitting diodes enabled by advanced heterostructures of type-ii nanoplateletsen_US
dc.typeArticleen_US

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