Near-infrared-emitting five-monolayer thick copper-doped CdSe nanoplatelets

Doped nanocrystals are instrumental to the high-performance luminescent solar concentrators (LSCs) and the color conversion devices. Recently, copper (Cu)-doped three and four monolayer (ML) thick CdSe nanoplatelets (NPLs) have been shown superior to the existing Cu-doped quantum dots (QDs) for thei...

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Main Authors: Sharma, Ashma, Sharma, Manoj, Gungor, Kivanc, Olutas, Murat, Dede, Didem, Demir, Hilmi Volkan
Other Authors: School of Electrical and Electronic Engineering
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/140210
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spelling sg-ntu-dr.10356-1402102023-02-28T19:44:44Z Near-infrared-emitting five-monolayer thick copper-doped CdSe nanoplatelets Sharma, Ashma Sharma, Manoj Gungor, Kivanc Olutas, Murat Dede, Didem Demir, Hilmi Volkan School of Electrical and Electronic Engineering School of Materials Science & Engineering School of Physical and Mathematical Sciences Centre of Excellence for Semiconductor Lighting and Displays Engineering::Electrical and electronic engineering CdSe Nanoplatelets Colloidal Quantum Wells Doped nanocrystals are instrumental to the high-performance luminescent solar concentrators (LSCs) and the color conversion devices. Recently, copper (Cu)-doped three and four monolayer (ML) thick CdSe nanoplatelets (NPLs) have been shown superior to the existing Cu-doped quantum dots (QDs) for their use in LSCs. However, additional improvement in the LSC performance can be achieved by further redshifting the emission into the near-infrared (NIR) region of electromagnetic spectrum and increasing the absorbed portion of the solar irradiation. Cu-doping into higher thicknesses of these atomically flat NPLs (e.g., ≥5 ML) can achieve these overarching goals. However, addition of the dopant ions during the nucleation stage disturbs this high-temperature growth process and leads to multiple populations of NPLs and QDs. Here, by carefully controlling the precursor chemistry the successful doping of Cu in five ML thick NPLs by high-temperature nucleation doping method is demonstrated. The optimized synthesis method shows nearly pure population of doped five ML thick NPLs, which possess ≈150 nm Stokes-shifted NIR emission with high quantum yield of 65 ± 2%. Structural, elemental, and optical studies are conducted to confirm the successful doping and understand the detailed photophysics. Finally, these materials are tested experimentally and theoretically for their performance as promising LSC materials. NRF (Natl Research Foundation, S’pore) Accepted version 2020-05-27T06:18:46Z 2020-05-27T06:18:46Z 2019 Journal Article Sharma, A., Sharma, M., Gungor, K., Olutas, M., Dede, D., & Demir, H. V. (2019). Near-infrared-emitting five-monolayer thick copper-doped CdSe nanoplatelets. Advanced Optical Materials, 7(22),1900831-. doi:10.1002/adom.201900831 2195-1071 https://hdl.handle.net/10356/140210 10.1002/adom.201900831 2-s2.0-85070907682 22 7 en Advanced Optical Materials This is the accepted version of the following article: Sharma, A., Sharma, M., Gungor, K., Olutas, M., Dede, D., & Demir, H. V. (2019). Near-infrared-emitting five-monolayer thick copper-doped CdSe nanoplatelets. Advanced Optical Materials, 7(22),1900831-., which has been published in final form at doi:10.1002/adom.201900831. This article may be used for non-commercial purposes in accordance with the Wiley Self-Archiving Policy [https://authorservices.wiley.com/authorresources/Journal-Authors/licensing/self-archiving.html]. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Electrical and electronic engineering
CdSe Nanoplatelets
Colloidal Quantum Wells
spellingShingle Engineering::Electrical and electronic engineering
CdSe Nanoplatelets
Colloidal Quantum Wells
Sharma, Ashma
Sharma, Manoj
Gungor, Kivanc
Olutas, Murat
Dede, Didem
Demir, Hilmi Volkan
Near-infrared-emitting five-monolayer thick copper-doped CdSe nanoplatelets
description Doped nanocrystals are instrumental to the high-performance luminescent solar concentrators (LSCs) and the color conversion devices. Recently, copper (Cu)-doped three and four monolayer (ML) thick CdSe nanoplatelets (NPLs) have been shown superior to the existing Cu-doped quantum dots (QDs) for their use in LSCs. However, additional improvement in the LSC performance can be achieved by further redshifting the emission into the near-infrared (NIR) region of electromagnetic spectrum and increasing the absorbed portion of the solar irradiation. Cu-doping into higher thicknesses of these atomically flat NPLs (e.g., ≥5 ML) can achieve these overarching goals. However, addition of the dopant ions during the nucleation stage disturbs this high-temperature growth process and leads to multiple populations of NPLs and QDs. Here, by carefully controlling the precursor chemistry the successful doping of Cu in five ML thick NPLs by high-temperature nucleation doping method is demonstrated. The optimized synthesis method shows nearly pure population of doped five ML thick NPLs, which possess ≈150 nm Stokes-shifted NIR emission with high quantum yield of 65 ± 2%. Structural, elemental, and optical studies are conducted to confirm the successful doping and understand the detailed photophysics. Finally, these materials are tested experimentally and theoretically for their performance as promising LSC materials.
author2 School of Electrical and Electronic Engineering
author_facet School of Electrical and Electronic Engineering
Sharma, Ashma
Sharma, Manoj
Gungor, Kivanc
Olutas, Murat
Dede, Didem
Demir, Hilmi Volkan
format Article
author Sharma, Ashma
Sharma, Manoj
Gungor, Kivanc
Olutas, Murat
Dede, Didem
Demir, Hilmi Volkan
author_sort Sharma, Ashma
title Near-infrared-emitting five-monolayer thick copper-doped CdSe nanoplatelets
title_short Near-infrared-emitting five-monolayer thick copper-doped CdSe nanoplatelets
title_full Near-infrared-emitting five-monolayer thick copper-doped CdSe nanoplatelets
title_fullStr Near-infrared-emitting five-monolayer thick copper-doped CdSe nanoplatelets
title_full_unstemmed Near-infrared-emitting five-monolayer thick copper-doped CdSe nanoplatelets
title_sort near-infrared-emitting five-monolayer thick copper-doped cdse nanoplatelets
publishDate 2020
url https://hdl.handle.net/10356/140210
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