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. 2023 Apr 6;15(4):1170. doi: 10.3390/pharmaceutics15041170

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© 2023 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/).

PMC Copyright notice

(A) Color range of GQDs mixtures, (B) emission PL spectra of selected mixtures, (C) printed GQDs images under daily and UV lights and (D) emission PL spectra of region that was indicated by arrows. Reprinted from Journal of Colloid and Interface Science, 579, Jingwen Zhao, Yanyan Zheng, Youyou Pang, Jie Chen, Zheye Zhang, Fengna Xi, and Peng Chen, Graphene quantum dots as full-color and stimulus-responsive fluorescence ink for information encryption, 307, copyright (2022), with permission from Elsevier [78].