Alloyed heterostructures of CdSexS1–x nanoplatelets with highly tunable optical gain performance

Here, we designed and synthesized alloyed heterostructures of CdSe S nanoplatelets (NPLs) using CdS coating in the lateral and vertical directions for the achievement of highly tunable optical gain performance. By using homogeneously alloyed CdSe S core NPLs as a seed, we prepared CdSe S /CdS core...

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Main Authors: Kelestemur, Yusuf, Dede, Didem, Gungor, Kivanc, Usanmaz, Can Firat, Erdem, Onur, Demir, Hilmi Volkan
Other Authors: School of Electrical and Electronic Engineering
Format: Article
Language:English
Published: 2021
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Online Access:https://hdl.handle.net/10356/150590
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-1505902021-06-07T04:20:23Z Alloyed heterostructures of CdSexS1–x nanoplatelets with highly tunable optical gain performance Kelestemur, Yusuf Dede, Didem Gungor, Kivanc Usanmaz, Can Firat Erdem, Onur Demir, Hilmi Volkan School of Electrical and Electronic Engineering School of Physical and Mathematical Sciences School of Materials Science and Engineering LUMINOUS! Centre of Excellence for Semiconductor Lighting & Displays Science::Physics Sulfur Heterostructures Here, we designed and synthesized alloyed heterostructures of CdSe S nanoplatelets (NPLs) using CdS coating in the lateral and vertical directions for the achievement of highly tunable optical gain performance. By using homogeneously alloyed CdSe S core NPLs as a seed, we prepared CdSe S /CdS core/crown NPLs, where CdS crown region is extended only in the lateral direction. With the sidewall passivation around inner CdSe S cores, we achieved enhanced photoluminescence quantum yield (PL-QY) (reaching 60%), together with increased absorption cross-section and improved stability without changing the emission spectrum of CdSe S alloyed core NPLs. In addition, we further extended the spectral tunability of these solution-processed NPLs with the synthesis of CdSe S /CdS core/shell NPLs. Depending on the sulfur composition of the CdSe S core and thickness of the CdS shell, CdSe S /CdS core/shell NPLs possessed highly tunable emission characteristics within the spectral range of 560-650 nm. Finally, we studied the optical gain performances of different heterostructures of CdSe S alloyed NPLs offering great advantages, including reduced reabsorption and spectrally tunable optical gain range. Despite their decreased PL-QY and reduced absorption cross-section upon increasing the sulfur composition, CdSe S based NPLs exhibit highly tunable amplified spontaneous emission performance together with low gain thresholds down to ∼53 μJ/cm2 . National Research Foundation (NRF) Accepted version 2021-06-07T04:20:23Z 2021-06-07T04:20:23Z 2017 Journal Article Kelestemur, Y., Dede, D., Gungor, K., Usanmaz, C. F., Erdem, O. & Demir, H. V. (2017). Alloyed heterostructures of CdSexS1–x nanoplatelets with highly tunable optical gain performance. Chemistry of Materials, 29(11), 4857-4865. https://dx.doi.org/10.1021/acs.chemmater.7b00829 1520-5002 0000-0003-1793-112X https://hdl.handle.net/10356/150590 10.1021/acs.chemmater.7b00829 2-s2.0-85020722727 11 29 4857 4865 en Chemistry of Materials This document is the Accepted Manuscript version of a Published Work that appeared in final form in Chemistry of Materials, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.chemmater.7b00829 application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Science::Physics
Sulfur
Heterostructures
spellingShingle Science::Physics
Sulfur
Heterostructures
Kelestemur, Yusuf
Dede, Didem
Gungor, Kivanc
Usanmaz, Can Firat
Erdem, Onur
Demir, Hilmi Volkan
Alloyed heterostructures of CdSexS1–x nanoplatelets with highly tunable optical gain performance
description Here, we designed and synthesized alloyed heterostructures of CdSe S nanoplatelets (NPLs) using CdS coating in the lateral and vertical directions for the achievement of highly tunable optical gain performance. By using homogeneously alloyed CdSe S core NPLs as a seed, we prepared CdSe S /CdS core/crown NPLs, where CdS crown region is extended only in the lateral direction. With the sidewall passivation around inner CdSe S cores, we achieved enhanced photoluminescence quantum yield (PL-QY) (reaching 60%), together with increased absorption cross-section and improved stability without changing the emission spectrum of CdSe S alloyed core NPLs. In addition, we further extended the spectral tunability of these solution-processed NPLs with the synthesis of CdSe S /CdS core/shell NPLs. Depending on the sulfur composition of the CdSe S core and thickness of the CdS shell, CdSe S /CdS core/shell NPLs possessed highly tunable emission characteristics within the spectral range of 560-650 nm. Finally, we studied the optical gain performances of different heterostructures of CdSe S alloyed NPLs offering great advantages, including reduced reabsorption and spectrally tunable optical gain range. Despite their decreased PL-QY and reduced absorption cross-section upon increasing the sulfur composition, CdSe S based NPLs exhibit highly tunable amplified spontaneous emission performance together with low gain thresholds down to ∼53 μJ/cm2 .
author2 School of Electrical and Electronic Engineering
author_facet School of Electrical and Electronic Engineering
Kelestemur, Yusuf
Dede, Didem
Gungor, Kivanc
Usanmaz, Can Firat
Erdem, Onur
Demir, Hilmi Volkan
format Article
author Kelestemur, Yusuf
Dede, Didem
Gungor, Kivanc
Usanmaz, Can Firat
Erdem, Onur
Demir, Hilmi Volkan
author_sort Kelestemur, Yusuf
title Alloyed heterostructures of CdSexS1–x nanoplatelets with highly tunable optical gain performance
title_short Alloyed heterostructures of CdSexS1–x nanoplatelets with highly tunable optical gain performance
title_full Alloyed heterostructures of CdSexS1–x nanoplatelets with highly tunable optical gain performance
title_fullStr Alloyed heterostructures of CdSexS1–x nanoplatelets with highly tunable optical gain performance
title_full_unstemmed Alloyed heterostructures of CdSexS1–x nanoplatelets with highly tunable optical gain performance
title_sort alloyed heterostructures of cdsexs1–x nanoplatelets with highly tunable optical gain performance
publishDate 2021
url https://hdl.handle.net/10356/150590
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