High external quantum efficiency light-emitting diodes enabled by advanced heterostructures of Type-II nanoplatelets

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buir.contributor.authorShabani, Farzan
buir.contributor.authorIşık, Furkan
buir.contributor.authorDelikanlı, Savaş
buir.contributor.authorDemir, Hilmi Volkan
buir.contributor.orcidShabani, Farzan|0000-0003-2174-5960
buir.contributor.orcidIşık, Furkan|0000-0003-2174-5960
buir.contributor.orcidDelikanlı, Savaş|0000-0002-0613-8014
buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112X
dc.citation.epage7644en_US
dc.citation.issueNumber8
dc.citation.spage7636
dc.citation.volumeNumber17
dc.contributor.authorDurmuşoğlu, E. G.
dc.contributor.authorHu, S.
dc.contributor.authorHernandez-Martinez, P. L.
dc.contributor.authorİzmir, M.
dc.contributor.authorShabani, Farzan
dc.contributor.authorGuo, M.
dc.contributor.authorGao, H.
dc.contributor.authorIşık, Furkan
dc.contributor.authorDelikanlı, Savaş
dc.contributor.authorSharma, V. K.
dc.contributor.authorLiu, B.
dc.contributor.authorDemir, Hilmi Volkan
dc.date.accessioned2024-03-11T13:02:44Z
dc.date.available2024-03-11T13:02:44Z
dc.date.issued2023-04-25
dc.departmentDepartment of Electrical and Electronics Engineering
dc.departmentDepartment of Physics
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)
dc.departmentNanotechnology Research Center (NANOTAM)
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.
dc.identifier.doi10.1021/acsnano.3c00046
dc.identifier.issn19360851
dc.identifier.urihttps://hdl.handle.net/11693/114517
dc.language.isoen
dc.publisherAmerican Chemical Society
dc.relation.isversionofhttps://dx.doi.org/10.1021/acsnano.3c00046
dc.source.titleACS Nano
dc.subjectType-II nanoplatelets
dc.subjectColloidal quantum wells
dc.subjectAdvanced heterostructures
dc.subjectLight-emitting diodes
dc.subjectExternal quantum efficiency
dc.titleHigh external quantum efficiency light-emitting diodes enabled by advanced heterostructures of Type-II nanoplatelets
dc.typeArticle

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