Narrow electroluminescence in bromide ligand-capped cadmium chalcogenide nanoplatelets

Colloidal zinc blende II-VI semiconductor nanoplatelets (NPLs) demonstrate as a promising class of materials for optoelectronic devices due to their unique excitonic characteristics, narrow emission linewidth, and quantum well-structure. Adopting heterostructures for these nanocrystals allows tuning...

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Main Authors: Thung, Yi Tian, Zhang, Zitong, Yan, Fei, Demir, Hilmi Volkan, Sun, Handong
Other Authors: School of Physical and Mathematical Sciences
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Language:English
Published: 2022
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Online Access:https://hdl.handle.net/10356/159992
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spelling sg-ntu-dr.10356-1599922023-02-28T20:07:06Z Narrow electroluminescence in bromide ligand-capped cadmium chalcogenide nanoplatelets Thung, Yi Tian Zhang, Zitong Yan, Fei Demir, Hilmi Volkan Sun, Handong School of Physical and Mathematical Sciences School of Electrical and Electronic Engineering School of Materials Science and Engineering LUMINOUS! Centre of Excellence for Semiconductor Lighting & Displays The Photonics Institute Science::Physics::Optics and light Cadmium Electroluminescence Colloidal zinc blende II-VI semiconductor nanoplatelets (NPLs) demonstrate as a promising class of materials for optoelectronic devices due to their unique excitonic characteristics, narrow emission linewidth, and quantum well-structure. Adopting heterostructures for these nanocrystals allows tuning of their optical features and enhances their photostability, photoluminescence (PL), quantum yield (QY), and color purity for further device integration. Exchanging of carboxylate capping ligands on top and bottom [001] facets of CdSe NPLs with halide ligands is an alternative to achieve the aims of spectral tunability and improve surface passivation, but to date there have been no reports on integrating the advantages of halide ligand exchanged CdSe NPLs for device fabrication. In this work, we demonstrate green electroluminescence (EL) of bromide ligand-capped CdSe NPLs as active emitters in an electrically driven light emitting diode (LED) with a low turn-on voltage of 3.0 V. We observed EL emission at 533.1 nm with a narrow linewidth of 19.4 nm, a maximum luminance of 1276 cd/m2, and the highest external quantum efficiency (EQE) of 0.803%. These results highlight the ability of halide ligand exchange in tuning the EL properties of CdSe NPL-LEDs and potential of bromide ligand-capped CdSe NPLs in contributing to the green emission region of NPL-LEDs, demonstrating its potential for future device integration and contribution to a high color rendering index of future NPL displays. Agency for Science, Technology and Research (A*STAR) Ministry of Education (MOE) National Research Foundation (NRF) Published version This work was supported through Grant Nos. NRF-CRP21- 2018-0007, NRF-CRP23-2019-0007, and AME-IRG-A20E5c0083. H.V.D and F.Y. gratefully acknowledge the financial support in part from the Singapore Agency for Science, Technology and Research (A STAR) SERC under Grant No. M21J9b0085, and the Singapore Ministry of Education Tier 1 grant (MOE-RG62/20). H.V.D. also gratefully acknowledges the support from TUBA. 2022-07-07T04:53:33Z 2022-07-07T04:53:33Z 2022 Journal Article Thung, Y. T., Zhang, Z., Yan, F., Demir, H. V. & Sun, H. (2022). Narrow electroluminescence in bromide ligand-capped cadmium chalcogenide nanoplatelets. Applied Physics Letters, 120(24), 241105-. https://dx.doi.org/10.1063/5.0094798 0003-6951 https://hdl.handle.net/10356/159992 10.1063/5.0094798 2-s2.0-85132307773 24 120 241105 en NRF-CRP21-2018-0007 NRF-CRP23-2019-0007 AME-IRG-A20E5c0083 M21J9b0085 MOE-RG62/20 Applied Physics Letters © 2022 Author(s). All rights reserved. This paper was published by AIP Publishing in Applied Physics Letters and is made available with permission of Author(s). 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::Optics and light
Cadmium
Electroluminescence
spellingShingle Science::Physics::Optics and light
Cadmium
Electroluminescence
Thung, Yi Tian
Zhang, Zitong
Yan, Fei
Demir, Hilmi Volkan
Sun, Handong
Narrow electroluminescence in bromide ligand-capped cadmium chalcogenide nanoplatelets
description Colloidal zinc blende II-VI semiconductor nanoplatelets (NPLs) demonstrate as a promising class of materials for optoelectronic devices due to their unique excitonic characteristics, narrow emission linewidth, and quantum well-structure. Adopting heterostructures for these nanocrystals allows tuning of their optical features and enhances their photostability, photoluminescence (PL), quantum yield (QY), and color purity for further device integration. Exchanging of carboxylate capping ligands on top and bottom [001] facets of CdSe NPLs with halide ligands is an alternative to achieve the aims of spectral tunability and improve surface passivation, but to date there have been no reports on integrating the advantages of halide ligand exchanged CdSe NPLs for device fabrication. In this work, we demonstrate green electroluminescence (EL) of bromide ligand-capped CdSe NPLs as active emitters in an electrically driven light emitting diode (LED) with a low turn-on voltage of 3.0 V. We observed EL emission at 533.1 nm with a narrow linewidth of 19.4 nm, a maximum luminance of 1276 cd/m2, and the highest external quantum efficiency (EQE) of 0.803%. These results highlight the ability of halide ligand exchange in tuning the EL properties of CdSe NPL-LEDs and potential of bromide ligand-capped CdSe NPLs in contributing to the green emission region of NPL-LEDs, demonstrating its potential for future device integration and contribution to a high color rendering index of future NPL displays.
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
Thung, Yi Tian
Zhang, Zitong
Yan, Fei
Demir, Hilmi Volkan
Sun, Handong
format Article
author Thung, Yi Tian
Zhang, Zitong
Yan, Fei
Demir, Hilmi Volkan
Sun, Handong
author_sort Thung, Yi Tian
title Narrow electroluminescence in bromide ligand-capped cadmium chalcogenide nanoplatelets
title_short Narrow electroluminescence in bromide ligand-capped cadmium chalcogenide nanoplatelets
title_full Narrow electroluminescence in bromide ligand-capped cadmium chalcogenide nanoplatelets
title_fullStr Narrow electroluminescence in bromide ligand-capped cadmium chalcogenide nanoplatelets
title_full_unstemmed Narrow electroluminescence in bromide ligand-capped cadmium chalcogenide nanoplatelets
title_sort narrow electroluminescence in bromide ligand-capped cadmium chalcogenide nanoplatelets
publishDate 2022
url https://hdl.handle.net/10356/159992
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