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. 2022 Mar 27;11:75. doi: 10.1038/s41377-022-00764-1

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© The Author(s) 2022

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 6 — a PL spectra of carbon-dot/cellulose nanocrystals, recorded using left- and right-handed circular polarizers (LCP and RCP, respectively) and b their g_Lum plotted as a function of emission wavelength. c CPL spectra of superstructures of blue, yellow, and red chiral carbon dots and glutamic diamide (solid and dotted lines show spectra of enantiomers). d–f CPL spectra and g_PL of cellulose nanocrystals and blue (d), green (e), and red (f) carbon dots from the carbon-dot/cellulose nanocrystal composites. Colored lines show photonic band gap superimposed on emission band; black lines show photonic band gap not overlapping with emission band. a, b Adapted with permission from⁶³ Copyright 2019 Wiley-VCH GmbH. c Adapted with permission from⁵⁹ Copyright 2021 Wiley-VCH GmbH. d–f Adapted with permission from⁶⁴ Copyright 2018 Wiley-VCH GmbH