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dc.contributor.authorDurmusoglu, Emek Goksuen_US
dc.contributor.authorHu, Sujuanen_US
dc.contributor.authorHernandez-Martinez, Pedro Ludwigen_US
dc.contributor.authorIzmir, Merveen_US
dc.contributor.authorShabani, Farzanen_US
dc.contributor.authorGuo, Minen_US
dc.contributor.authorGao, Huayuen_US
dc.contributor.authorIsik, Furkanen_US
dc.contributor.authorDelikanli, Savasen_US
dc.contributor.authorSharma, Vijay Kumaren_US
dc.contributor.authorLiu, Baiquanen_US
dc.contributor.authorDemir, Hilmi Volkanen_US
dc.identifier.citationDurmusoglu, E. G., Hu, S., Hernandez-Martinez, P. L., Izmir, M., Shabani, F., Guo, M., Gao, H., Isik, F., Delikanli, S., Sharma, V. K., Liu, B. & Demir, H. V. (2023). High external quantum efficiency light-emitting diodes enabled by advanced heterostructures of type-II nanoplatelets. ACS Nano.
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.sponsorshipAgency for Science, Technology and Research (A*STAR)en_US
dc.description.sponsorshipMinistry of Education (MOE)en_US
dc.relation.ispartofACS Nanoen_US
dc.rights© 2023 The Authors. Published by American Chemical Society. This is an open-access article distributed under the terms of the Creative Commons Attribution License.en_US
dc.subjectEngineering::Materials::Nanostructured materialsen_US
dc.titleHigh external quantum efficiency light-emitting diodes enabled by advanced heterostructures of type-II nanoplateletsen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Electrical and Electronic Engineeringen_US
dc.contributor.schoolSchool of Physical and Mathematical Sciencesen_US
dc.contributor.schoolSchool of Materials Science and Engineeringen_US
dc.contributor.researchThe Photonics Instituteen_US
dc.contributor.researchLUMINOUS! Centre of Excellence for Semiconductor Lighting & Displaysen_US
dc.description.versionPublished versionen_US
dc.subject.keywordsType-II Nanoplateletsen_US
dc.subject.keywordsColloidal Quantum Wellsen_US
dc.description.acknowledgementThis research is supported by the Singapore Agency for Science, Technology and Research (A*STAR) MTC program, Grant No. M21J9b0085, and the Ministry of Education, Singapore, under its Academic Research Fund Tier 1 (MOERG62/20), and partly from TUBITAK 119N343, 120N076, 121C266, 121N395, and 20AG001. H.V.D. also gratefully acknowledges the support from the TUBA and TUBITAK 2247-A National Leader Researchers Program (121C266). B.L. acknowledges the support from the Science and Technology Program of Guangdong Province under Grant 2021A0505110009 and the National Natural Science Foundation of China under Grant 62104265.en_US
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