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Title: Narrow electroluminescence in bromide ligand-capped cadmium chalcogenide nanoplatelets
Authors: Thung, Yi Tian
Zhang, Zitong
Yan, Fei
Demir, Hilmi Volkan
Sun, Handong
Keywords: Science::Physics::Optics and light
Issue Date: 2022
Source: 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-.
Project: NRF-CRP21-2018-0007
Journal: Applied Physics Letters
Abstract: 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.
ISSN: 0003-6951
DOI: 10.1063/5.0094798
Schools: School of Physical and Mathematical Sciences 
School of Electrical and Electronic Engineering 
School of Materials Science and Engineering 
Research Centres: LUMINOUS! Centre of Excellence for Semiconductor Lighting & Displays 
The Photonics Institute 
Rights: © 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).
Fulltext Permission: open
Fulltext Availability: With Fulltext
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