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Title: On the rational design of core/(multi)-crown type-II heteronanoplatelets
Authors: Delikanli, Savas
Canimkurbey, Betul
Hernández-Martínez, Pedro Ludwig
Shabani, Farzan
Isik, Ahmet Tarik
Ozkan, Ilayda
Bozkaya, Iklim
Bozkaya, Taylan
Isik, Furkan
Durmusoglu, Emek Goksu
Izmir, Merve
Akgun, Hakan
Demir, Hilmi Volkan
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2023
Source: Delikanli, S., Canimkurbey, B., Hernández-Martínez, P. L., Shabani, F., Isik, A. T., Ozkan, I., Bozkaya, I., Bozkaya, T., Isik, F., Durmusoglu, E. G., Izmir, M., Akgun, H. & Demir, H. V. (2023). On the rational design of core/(multi)-crown type-II heteronanoplatelets. Journal of the American Chemical Society, 145(22), 12033-12043.
Project: M21J9b0085 
Journal: Journal of the American Chemical Society 
Abstract: Solution-processed two-dimensional nanoplatelets (NPLs) allowing lateral growth of a shell (crown) by not affecting the pure confinement in the vertical direction provide unprecedented opportunities for designing heterostructures for light-emitting and -harvesting applications. Here, we present a pathway for designing and synthesizing colloidal type-II core/(multi-)crown hetero-NPLs and investigate their optical properties. Stoke's shifted broad photoluminescence (PL) emission and long PL lifetime (∼few 100 ns) together with our wavefunction calculations confirm the type-II electronic structure in the synthesized CdS/CdSe1-xTex core/crown hetero-NPLs. In addition, we experimentally obtained the band-offsets between CdS, CdTe, and CdSe in these NPLs. These results helped us designing hetero-NPLs with near-unity PL quantum yield in the CdSe/CdSe1-xTex/CdSe/CdS core/multicrown architecture. These core/multicrown hetero-NPLs have two type-II interfaces unlike traditional type-II NPLs having only one and possess a CdS ending layer for passivation and efficient suppression of stacking required for optoelectronic applications. The light-emitting diode (LED) obtained using multicrown hetero-NPLs exhibits a maximum luminance of 36,612 cd/m2 and external quantum efficiency of 9.3%, which outcompetes the previous best results from type-II NPL-based LEDs. These findings may enable designs of future advanced heterostructures of NPLs which are anticipated to show desirable results, especially for LED and lasing platforms.
ISSN: 0002-7863
DOI: 10.1021/jacs.3c00999
Schools: School of Electrical and Electronic Engineering 
School of Physical and Mathematical Sciences 
School of Materials Science and Engineering 
Research Centres: Luminous! Center of Excellence for Semiconductor Lighting and Displays
Rights: © 2023 The Authors. Published by American Chemical Society. This publication is licensed under CC-BY 4.0.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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