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Copyright © 2020 Xuan-Dung Mai et al. This is an open access article distributed under the Creative Commons Attribution License (the “License”), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. https://creativecommons.org/licenses/by/4.0/

Abstract

Solid assemblies of carbon quantum dots (CQDs) are important for diverse applications including LEDs, solar cells, and photosensors; their optical and electrical properties have not been explored yet. Herein, we used amphiphilic CQDs synthesized from citric acid and thiourea by a solvothermal method to fabricate CQD solid films. Optical properties of CQDs studied by UV-Vis and photoluminescence spectroscopies indicate that CQDs possess three different emission centers at 425 nm, 525 nm, and 625 nm originating from C sp2 states, N-states, and S-states, respectively. In a solid state, π-π stacking quenched the blue emission, while the red emission increased. Importantly, CQD films exhibited excitation independence, which is important to design solid-state lighting applications.

Details

Title
Excitation-Independent Emission of Carbon Quantum Dot Solids
Author
Xuan-Dung Mai 1   VIAFID ORCID Logo  ; Yen Thi Hai Phan 2 ; Van-Quang, Nguyen 3 

 Institute of Research and Development, Duy Tan University, Danang 550000, Vietnam; Department of Chemistry, Hanoi Pedagogical University 2, Xuan Hoa, Phuc Yen, Vinh Phuc, Vietnam 
 Department of Chemistry, Hanoi Pedagogical University 2, Xuan Hoa, Phuc Yen, Vinh Phuc, Vietnam; Archimedes Dong Anh Highschool, Dong Anh, Hanoi, Vietnam 
 Department of Chemistry, Hanoi Pedagogical University 2, Xuan Hoa, Phuc Yen, Vinh Phuc, Vietnam 
Editor
Dimitrios E Manolakos
Publication year
2020
Publication date
2020
Publisher
John Wiley & Sons, Inc.
ISSN
16878434
e-ISSN
16878442
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2474916800
Copyright
Copyright © 2020 Xuan-Dung Mai et al. This is an open access article distributed under the Creative Commons Attribution License (the “License”), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. https://creativecommons.org/licenses/by/4.0/