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. 2017 Oct 26;7:14104. doi: 10.1038/s41598-017-14269-0

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© The Author(s) 2017

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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(a) Absorption (black) and PL (red) spectrum of CdSe/CdS QDs. Excitation wavelength for PL: λ_ex = 420 nm. Inset in (a): Tauc’s plot for determining the energy gap, resulting in an E _g = 2.45 eV for the analyzed QDs. (b) PL decay for QDs in solution and in thin film. (c) Images of QD solution under visible (top) and UV light (bottom).