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High External Quantum Efficiency Light-Emitting Diodes Enabled by Advanced Heterostructures of Type-II Nanoplatelets

[Image: see text] Colloidal 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, typ...

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Autores principales: Durmusoglu, Emek G., Hu, Sujuan, Hernandez-Martinez, Pedro Ludwig, Izmir, Merve, Shabani, Farzan, Guo, Min, Gao, Huayu, Isik, Furkan, Delikanli, Savas, Sharma, Vijay Kumar, Liu, Baiquan, Demir, Hilmi Volkan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2023
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10134493/
https://www.ncbi.nlm.nih.gov/pubmed/36912794
http://dx.doi.org/10.1021/acsnano.3c00046
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author Durmusoglu, Emek G.
Hu, Sujuan
Hernandez-Martinez, Pedro Ludwig
Izmir, Merve
Shabani, Farzan
Guo, Min
Gao, Huayu
Isik, Furkan
Delikanli, Savas
Sharma, Vijay Kumar
Liu, Baiquan
Demir, Hilmi Volkan
author_facet Durmusoglu, Emek G.
Hu, Sujuan
Hernandez-Martinez, Pedro Ludwig
Izmir, Merve
Shabani, Farzan
Guo, Min
Gao, Huayu
Isik, Furkan
Delikanli, Savas
Sharma, Vijay Kumar
Liu, Baiquan
Demir, Hilmi Volkan
author_sort Durmusoglu, Emek G.
collection PubMed
description [Image: see text] Colloidal 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/CdSe(x)Te(1–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.
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spelling pubmed-101344932023-04-28 High External Quantum Efficiency Light-Emitting Diodes Enabled by Advanced Heterostructures of Type-II Nanoplatelets Durmusoglu, Emek G. Hu, Sujuan Hernandez-Martinez, Pedro Ludwig Izmir, Merve Shabani, Farzan Guo, Min Gao, Huayu Isik, Furkan Delikanli, Savas Sharma, Vijay Kumar Liu, Baiquan Demir, Hilmi Volkan ACS Nano [Image: see text] Colloidal 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/CdSe(x)Te(1–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. American Chemical Society 2023-03-13 /pmc/articles/PMC10134493/ /pubmed/36912794 http://dx.doi.org/10.1021/acsnano.3c00046 Text en © 2023 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by/4.0/Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Durmusoglu, Emek G.
Hu, Sujuan
Hernandez-Martinez, Pedro Ludwig
Izmir, Merve
Shabani, Farzan
Guo, Min
Gao, Huayu
Isik, Furkan
Delikanli, Savas
Sharma, Vijay Kumar
Liu, Baiquan
Demir, Hilmi Volkan
High External Quantum Efficiency Light-Emitting Diodes Enabled by Advanced Heterostructures of Type-II Nanoplatelets
title High External Quantum Efficiency Light-Emitting Diodes Enabled by Advanced Heterostructures of Type-II Nanoplatelets
title_full High External Quantum Efficiency Light-Emitting Diodes Enabled by Advanced Heterostructures of Type-II Nanoplatelets
title_fullStr High External Quantum Efficiency Light-Emitting Diodes Enabled by Advanced Heterostructures of Type-II Nanoplatelets
title_full_unstemmed High External Quantum Efficiency Light-Emitting Diodes Enabled by Advanced Heterostructures of Type-II Nanoplatelets
title_short High External Quantum Efficiency Light-Emitting Diodes Enabled by Advanced Heterostructures of Type-II Nanoplatelets
title_sort high external quantum efficiency light-emitting diodes enabled by advanced heterostructures of type-ii nanoplatelets
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10134493/
https://www.ncbi.nlm.nih.gov/pubmed/36912794
http://dx.doi.org/10.1021/acsnano.3c00046
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