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. 2018 Nov 13;8:16734. doi: 10.1038/s41598-018-35224-7

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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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Room temperature photoluminescence spectrum of a Ge film with a tensile strain value of 2.52%, under the excitation of a 532 nm continuous wave pumping laser. The laser power was 500 mW, and the spot size on sample was about 1 mm. The spike at ~2128 nm came from fourth-order harmonic of the pumping laser. Modified Gaussian fitting and Lorentzian fitting of the experimental data are also shown.