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Unraveling the origin of near-infrared emission in carbon dots by ultrafast spectroscopy

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Title
Unraveling the origin of near-infrared emission in carbon dots by ultrafast spectroscopy
Author(s)
Park, Yoonsang; Minh Dao Tran; Kim, Yujin; Won, Sungyeon; Kim, Young-Hoon; Lee, Tae-Woo; Gregorkiewicz, Tom; Young Hee Lee; Ji-Hee Kim; Kwon, Woosung
Publication Date
2022-03-01
Journal
Carbon, v.188, pp.229 - 237
Publisher
Elsevier Ltd
Abstract
© 2021 Elsevier LtdCarbon dots (CDs) are unique light-emissive nanoparticles that are valuable for various applications. However, their complex chemical structures and the limited research interest in their visible-light emission hinder the understanding of their emission structures. Herein, we report the existence of near-infrared (NIR) emissive states originating from the graphitic cores in CDs, which exhibit a completely different behavior from their well-known visible emissive states. Using ultrafast spectroscopy and density functional theory (DFT) calculations, we elucidate the emission mechanism and suggest that small (1–2 nm) graphitic subregions in CDs produce the NIR emissive states, which are rarely affected by surface chemistry changes. Our proposed mechanism and its universality are investigated comprehensively by a comparative analysis with graphene oxide and other types of CDs obtained by different synthetic methods. Finally, we propose a comprehensive emission structure of CDs and redefine the role of structural components in visible-to-NIR emission.
URI
https://pr.ibs.re.kr/handle/8788114/10974
DOI
10.1016/j.carbon.2021.11.063
ISSN
0008-6223
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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