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. 2019 Oct 22;9(10):1500. doi: 10.3390/nano9101500

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© 2019 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 (http://creativecommons.org/licenses/by/4.0/).

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Photographs of poly (vinyl alcohol (PVA) film (a) before and (b) after encapsulating with N–CDs under ambient light (up) and UV light (down) and (c) PL spectra of PVA/N–CDs film at different excitation wavelengths (310–390 nm).