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. 2018 Oct 24;8:15706. doi: 10.1038/s41598-018-33941-7

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© The Author(s) 2018

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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Average EF shown on top of lithium phosphate Raman spectrum. The spectrum was plotted from public spectral data available at the RRUFF Raman spectral database^24,25. This spectrum has similar Raman emission lines to phosphate anion. Wavenumbers for EF were calculated with excitation wavelength of ≈785 nm. Enhancement changes from $6 \cdot 10^{4}$ to $1 \cdot 10^{5}$ .