Unraveling the origin of near-infrared emission in carbon dots by ultrafast spectroscopy
- Authors
- Park, Yoonsang; Tran, Minh Dao; Kim, Yujin; Won, Sungyeon; Kim, Young-Hoon; Lee, Tae-Woo; Gregorkiewicz, Tom; Lee, Young Hee; Kim, Ji-Hee; Kwon, Woosung
- Issue Date
- Mar-2022
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Carbon dot; Near-infrared; Photoluminescence mechanism; Energy structure; Ultrafast spectroscopy
- Citation
- CARBON, v.188, pp 229 - 237
- Pages
- 9
- Journal Title
- CARBON
- Volume
- 188
- Start Page
- 229
- End Page
- 237
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/145867
- DOI
- 10.1016/j.carbon.2021.11.063
- ISSN
- 0008-6223
1873-3891
- Abstract
- Carbon 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.
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