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. 2020 Dec 4;10:21262. doi: 10.1038/s41598-020-78070-2

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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(a) UV–Vis spectra of GQDs-500 and GQDs-500-M showing a strong absorption at 300 and 270–280 nm range, respectively. (b) The PL spectra of GQDs-500-M at a range of excitation wavelengths (insets are the photographs of GQDs-500-M solution under visible and 365 nm UV light) and (c) normalised PL spectra showing a red shift in PL emission. Figures (a)–(c) were plotted using OriginPro 2018b (https://www.originlab.com) and inset photographs in (b) were taken using iPhone Xs Max (https://www.apple.com).