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...
| Main Authors: | , , , , |
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| Format: | Journal Article |
| Language: | English |
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2022
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| Online Access: | https://hdl.handle.net/10356/159992 |
| _version_ | 1811694710129950720 |
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| author | Thung, Yi Tian Zhang, Zitong Yan, Fei Demir, Hilmi Volkan Sun, Handong |
| 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 |
| author_sort | Thung, Yi Tian |
| collection | NTU |
| 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. |
| first_indexed | 2024-10-01T07:11:54Z |
| format | Journal Article |
| id | ntu-10356/159992 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:11:54Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-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 |
| 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 |
| title | 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_short | Narrow electroluminescence in bromide ligand-capped cadmium chalcogenide nanoplatelets |
| title_sort | narrow electroluminescence in bromide ligand capped cadmium chalcogenide nanoplatelets |
| topic | Science::Physics::Optics and light Cadmium Electroluminescence |
| url | https://hdl.handle.net/10356/159992 |
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