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© 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

It is known that, by taking advantage of heteroatom doping, the electronic states and transition channels in carbon nano-dots (CNDs) can be effectively modulated. Thus, the photoluminescence (PL) properties of CNDs can be changed. For potential applications of CNDs as advanced materials for optoelectronic devices, it is important and significant to develop the practical techniques for doping heteroatoms into CNDs. In this work, we synthesize the multi-color fluorescent by using a fast and effective microwave method where the CNDs are nitrogen-doped. We examine the influence of different ratios of the raw materials on the structure and optical properties of N-CNDs. The results show that the prepared N-CNDs can generate blue (445 nm), green (546 nm), and orange (617 nm) fluorescence or PL with the mass ratio of the raw materials at 1:1, 1:2 and 1:3, respectively. We find that the N content in N-CNDs leads to different surface/edge states in nπ domain. Thus, the wavelength of the PL emission from N-CNDs can be tuned via controlling the N concentration doped into the CNDs. Moreover, it is shown that the intensity of the PL from N-CNDs is mainly positively related to the content of C-O groups attached on the surface/edges of the N-CNDs. This study provides an effective experimental method and technical way to improve the fluorescent emission, and to modulate the color of the PL emission from CNDs.

Details

Title
Preparation and Fluorescent Wavelength Control of Multi-Color Nitrogen-Doped Carbon Nano-Dots
Author
Li, Wenli 1 ; Tang, Ju 2 ; Li, Yuzhao 1 ; Bai, Han 1 ; Zhang, Weizuo 1 ; Zhang, Jin 3 ; Xiao, Yiming 1   VIAFID ORCID Logo  ; Xu, Wen 4 

 School of Physics and Astronomy, Yunnan University, Kunming 650091, China; 18388308185@163.com (W.L.); jutang_ynu@163.com (J.T.); liyuzhao@mail.ynu.edu.cn (Y.L.); bh001925@163.com (H.B.); zhangwz@ynu.edu.cn (W.Z.) 
 School of Physics and Astronomy, Yunnan University, Kunming 650091, China; 18388308185@163.com (W.L.); jutang_ynu@163.com (J.T.); liyuzhao@mail.ynu.edu.cn (Y.L.); bh001925@163.com (H.B.); zhangwz@ynu.edu.cn (W.Z.); Department of Physics, School of Electrical and Information Technology, Yunnan Minzu University, Kunming 650504, China 
 School of Physics and Astronomy, Yunnan University, Kunming 650091, China; 18388308185@163.com (W.L.); jutang_ynu@163.com (J.T.); liyuzhao@mail.ynu.edu.cn (Y.L.); bh001925@163.com (H.B.); zhangwz@ynu.edu.cn (W.Z.); Yunnan Carbon Base Technology Co., Ltd., Kunming 650028, China 
 School of Physics and Astronomy, Yunnan University, Kunming 650091, China; 18388308185@163.com (W.L.); jutang_ynu@163.com (J.T.); liyuzhao@mail.ynu.edu.cn (Y.L.); bh001925@163.com (H.B.); zhangwz@ynu.edu.cn (W.Z.); Micro Optical Instruments Inc., Shenzhen 518118, China; Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China 
First page
3190
Publication year
2021
Publication date
2021
Publisher
MDPI AG
e-ISSN
20794991
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2612832461
Copyright
© 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.