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. 2019 Aug 13;9:11765. doi: 10.1038/s41598-019-48056-w

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© The Author(s) 2019

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) Averaged spectral emission from below (black dashed line –excitation energy 0.2 mJ – and red long dashed line, excitation energy 0.6 mJ) to above (blue continuous line– excitation energy 2.4 mJ) threshold for sample CA-ZnO-Ag; (b) Emission spectral linewidth (blue squares) and emission intensity (black circles) dependence on excitation energy at 5 Hz. The dashed straight line indicates the threshold energy on the horizontal scale. (c) a single shot spectrum (excitation above threshold), in which spikes (see inset in c) can be seen.