High external quantum efficiency light-emitting diodes enabled by advanced heterostructures of type-II nanoplatelets
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...
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sg-ntu-dr.10356-1651662023-03-20T15:34:11Z High external quantum efficiency light-emitting diodes enabled by advanced heterostructures of type-II nanoplatelets Durmusoglu, Emek Goksu 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 School of Electrical and Electronic Engineering School of Physical and Mathematical Sciences School of Materials Science and Engineering The Photonics Institute LUMINOUS! Centre of Excellence for Semiconductor Lighting & Displays Engineering::Materials::Nanostructured materials Type-II Nanoplatelets Colloidal Quantum Wells 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/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. Agency for Science, Technology and Research (A*STAR) Ministry of Education (MOE) Published version This 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. 2023-03-19T09:36:22Z 2023-03-19T09:36:22Z 2023 Journal Article Durmusoglu, 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. https://dx.doi.org/10.1021/acsnano.3c00046 1936-0851 https://hdl.handle.net/10356/165166 10.1021/acsnano.3c00046 en M21J9b0085 MOE-RG62/20 ACS Nano © 2023 The Authors. Published by American Chemical Society. This is an open-access article distributed under the terms of the Creative Commons Attribution License. application/pdf |
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Engineering::Materials::Nanostructured materials Type-II Nanoplatelets Colloidal Quantum Wells Durmusoglu, Emek Goksu 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 |
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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/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. |
author2 |
School of Electrical and Electronic Engineering |
author_facet |
School of Electrical and Electronic Engineering Durmusoglu, Emek Goksu 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 |
format |
Article |
author |
Durmusoglu, Emek Goksu 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 Goksu |
title |
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_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_sort |
high external quantum efficiency light-emitting diodes enabled by advanced heterostructures of type-ii nanoplatelets |
publishDate |
2023 |
url |
https://hdl.handle.net/10356/165166 |
_version_ |
1761781850624229376 |