Understanding the suitable alloying conditions for highly efficient Cu- and Mn-doped Zn1-xCdxS/ZnS core-shell quantum dots

Doping of alloyed colloidal quantum dots (QDs) has garnered significant attention for providing tunable and Stokes-shifted emission. By alloying the host semiconductor nanocrystals (NCs), their band gap can be tuned. With the specific addition of dopant ions, these NCs can emit tunable emissions wit...

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Main Authors: Kaur, Manpreet, Sharma, Ashma, Erdem, Onur, Kumar, Akshay, Demir, Hilmi Volkan, Sharma, Manoj
Other Authors: School of Electrical and Electronic Engineering
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Language:English
Published: 2024
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Online Access:https://hdl.handle.net/10356/173999
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spelling sg-ntu-dr.10356-1739992024-03-15T15:39:51Z Understanding the suitable alloying conditions for highly efficient Cu- and Mn-doped Zn1-xCdxS/ZnS core-shell quantum dots Kaur, Manpreet Sharma, Ashma Erdem, Onur Kumar, Akshay Demir, Hilmi Volkan Sharma, Manoj School of Electrical and Electronic Engineering LUMINOUS! Centre of Excellence for Semiconductor Lighting & Displays Physics Colloidal quantum dots Copper-doping Doping of alloyed colloidal quantum dots (QDs) has garnered significant attention for providing tunable and Stokes-shifted emission. By alloying the host semiconductor nanocrystals (NCs), their band gap can be tuned. With the specific addition of dopant ions, these NCs can emit tunable emissions within the visible spectrum. However, while doped and alloyed quantum dots (QDs) have shown promise for tunable emissions, their emission qualities have not been consistent across the spectrum. Here, we report the synthesis of high-quality Cu- and Mn-doped ZnxCd1-xS (x = 0–1) alloyed QDs by a colloidal non-injection method. In this study, we examined the effect of different dopant ions on the optical properties of similar alloyed nanocrystals. The deposition of a ZnS shell on these doped QDs significantly improves their quantum yield (QY), increasing it from 7.0 % to 50.0 % for Cu-doped QDs and from 30.0 % to 80.0 % for Mn-doped QDs. The Cu-doped QDs exhibit tunable emission from green to red across the visible spectrum by varying the Zn/Cd ratio, whereas the Mn-doped QDs show a fixed orange emission. Interestingly, the Cu-doped alloyed QDs show a contrasting trend in quantum yield (QY) compared to those of Mn-doped QDs when the amount of Cd in ZnCdS alloyed QDs is systematically changed. As the amount of Cd increases in the ZnCdS alloyed QDs, the Cu-doped QDs show both an increase in average lifetime and an increase in QY. In contrast, for the Mn-doped QDs, the decay lifetime values remain fairly constant for different amounts of Cd in the ZnCdS alloyed QDs, but the QY decreases as the amount of Cd increases. The results of this study may facilitate the design of optimal alloying combinations for Cu/Mn-doped QDs in optoelectronic applications. Agency for Science, Technology and Research (A*STAR) Ministry of Education (MOE) Published version M.S. acknowledge funding through the Australian Research Council Center of Excellence in Exciton Science (Grant No. CE170100026). H.V.D. acknowledges financial support in part from the Singapore Agency for Science, Technology and Research (A*STAR) MTC program under grant number M21J9b0085, Ministry of Education, Singapore, under its Academic Research Fund Tier 1 (MOE-RG62/20). H.V.D. also acknowledges support from TUBA and TUBITAK 2247-A National Leader Researchers Program (121C266). O.E. acknowledges the support of TUBITAK through BIDEB 2211 program. M.K. would like to acknowledge the University Grant Commission (UGC), India, for providing financial support (MANF-SRF). 2024-03-11T07:45:26Z 2024-03-11T07:45:26Z 2023 Journal Article Kaur, M., Sharma, A., Erdem, O., Kumar, A., Demir, H. V. & Sharma, M. (2023). Understanding the suitable alloying conditions for highly efficient Cu- and Mn-doped Zn1-xCdxS/ZnS core-shell quantum dots. Optical Materials, 145, 114471-. https://dx.doi.org/10.1016/j.optmat.2023.114471 0925-3467 https://hdl.handle.net/10356/173999 10.1016/j.optmat.2023.114471 145 114471 en M21J9b0085 MOE-RG62/20 Optical Materials © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Physics
Colloidal quantum dots
Copper-doping
spellingShingle Physics
Colloidal quantum dots
Copper-doping
Kaur, Manpreet
Sharma, Ashma
Erdem, Onur
Kumar, Akshay
Demir, Hilmi Volkan
Sharma, Manoj
Understanding the suitable alloying conditions for highly efficient Cu- and Mn-doped Zn1-xCdxS/ZnS core-shell quantum dots
description Doping of alloyed colloidal quantum dots (QDs) has garnered significant attention for providing tunable and Stokes-shifted emission. By alloying the host semiconductor nanocrystals (NCs), their band gap can be tuned. With the specific addition of dopant ions, these NCs can emit tunable emissions within the visible spectrum. However, while doped and alloyed quantum dots (QDs) have shown promise for tunable emissions, their emission qualities have not been consistent across the spectrum. Here, we report the synthesis of high-quality Cu- and Mn-doped ZnxCd1-xS (x = 0–1) alloyed QDs by a colloidal non-injection method. In this study, we examined the effect of different dopant ions on the optical properties of similar alloyed nanocrystals. The deposition of a ZnS shell on these doped QDs significantly improves their quantum yield (QY), increasing it from 7.0 % to 50.0 % for Cu-doped QDs and from 30.0 % to 80.0 % for Mn-doped QDs. The Cu-doped QDs exhibit tunable emission from green to red across the visible spectrum by varying the Zn/Cd ratio, whereas the Mn-doped QDs show a fixed orange emission. Interestingly, the Cu-doped alloyed QDs show a contrasting trend in quantum yield (QY) compared to those of Mn-doped QDs when the amount of Cd in ZnCdS alloyed QDs is systematically changed. As the amount of Cd increases in the ZnCdS alloyed QDs, the Cu-doped QDs show both an increase in average lifetime and an increase in QY. In contrast, for the Mn-doped QDs, the decay lifetime values remain fairly constant for different amounts of Cd in the ZnCdS alloyed QDs, but the QY decreases as the amount of Cd increases. The results of this study may facilitate the design of optimal alloying combinations for Cu/Mn-doped QDs in optoelectronic applications.
author2 School of Electrical and Electronic Engineering
author_facet School of Electrical and Electronic Engineering
Kaur, Manpreet
Sharma, Ashma
Erdem, Onur
Kumar, Akshay
Demir, Hilmi Volkan
Sharma, Manoj
format Article
author Kaur, Manpreet
Sharma, Ashma
Erdem, Onur
Kumar, Akshay
Demir, Hilmi Volkan
Sharma, Manoj
author_sort Kaur, Manpreet
title Understanding the suitable alloying conditions for highly efficient Cu- and Mn-doped Zn1-xCdxS/ZnS core-shell quantum dots
title_short Understanding the suitable alloying conditions for highly efficient Cu- and Mn-doped Zn1-xCdxS/ZnS core-shell quantum dots
title_full Understanding the suitable alloying conditions for highly efficient Cu- and Mn-doped Zn1-xCdxS/ZnS core-shell quantum dots
title_fullStr Understanding the suitable alloying conditions for highly efficient Cu- and Mn-doped Zn1-xCdxS/ZnS core-shell quantum dots
title_full_unstemmed Understanding the suitable alloying conditions for highly efficient Cu- and Mn-doped Zn1-xCdxS/ZnS core-shell quantum dots
title_sort understanding the suitable alloying conditions for highly efficient cu- and mn-doped zn1-xcdxs/zns core-shell quantum dots
publishDate 2024
url https://hdl.handle.net/10356/173999
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