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. 2017 Jun 19;7:3787. doi: 10.1038/s41598-017-03891-7

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© The Author(s) 2017

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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Non-linear optical characterization of a polymer semiconductor material roll coated on a flexible substrate. (a) Image of the flexible PET substrate with R2R printed source and drain silver electrodes covered by P3HT polymer semiconductor stripes. (b) Schematic of the non-linear optical microscope. (c) Absorption spectrum of P3HT (blue curve), emission spectrum of P3HT (green curve) and excitation laser spectrum (red coloured region). The green coloured region represents the amount of photoluminescence from P3HT detected in the experiment, considering that a 670 nm short pass filter is used. The blue arrow represents the effective wavelength at which the two-photon absorption occurs.