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Title: High external quantum efficiency light-emitting diodes enabled by advanced heterostructures of type-II nanoplatelets
Authors: 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
Keywords: Engineering::Materials::Nanostructured materials
Issue Date: 2023
Source: 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.
Project: M21J9b0085 
Journal: ACS Nano 
Abstract: 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.
ISSN: 1936-0851
DOI: 10.1021/acsnano.3c00046
Schools: School of Electrical and Electronic Engineering 
School of Physical and Mathematical Sciences 
School of Materials Science and Engineering 
Research Centres: The Photonics Institute 
LUMINOUS! Centre of Excellence for Semiconductor Lighting & Displays 
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.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles
MSE Journal Articles
SPMS Journal Articles

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