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. 2023 Apr 19;13:6371. doi: 10.1038/s41598-023-33652-8

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© The Author(s) 2023

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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Optical measurements of CDs using UV Visible, fluorescence spectroscopy and DLS technique. (a) Ultraviolet absorption spectra of CDs (Inset: Images of CDs under daylight and UV irradiation). (b) Excitation and emission spectra of the CDs. (c) Fluorescence emission spectra of CDs excitation wavelengths (350 nm to 550 nm range) with increments of 50 nm. (d) DLS analysis of CDs.