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. 2016 Feb 29;11:110. doi: 10.1186/s11671-016-1326-8

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© Sun et al. 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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Fig. 3 — Photoluminescence properties of CDs. a UV-vis absorption of CDs (inset was the photo under UV light). b PL emission spectra of CDs under different excitation wavelength from 300 to 440 nm. c PL QY of CDs prepared by adding different volumes of EA. d PL emission spectra of CDs with 1 mL EA added (CD-1) under different excitation wavelength from 300 to 440 nm