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. 2018 Jun 17;8(6):443. doi: 10.3390/nano8060443

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© 2018 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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Ultraviolet-visible (UV-vis) absorption spectrum (a) and photoluminescent (PL) emission spectra at different excitation wavelengths (b) of N-CNPs. Inset: photographs of N-CNPs in water under daylight and UV irradiation.