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. 2022 Oct 8;12:16919. doi: 10.1038/s41598-022-20596-8

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© The Author(s) 2022

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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The non-linear optical response of a colloidal quantum dot film. (a) Log–log plot showing the emission intensity from a series of points chosen to represent 3 different region types on the sample: QDs on the Si substrate (labels Si1-3), QDs on the Al layer (Al1-3), and QD clusters on the surface (C1-3). (b)–(d) Show images created by taking the ratio of emission intensity maps recorded at adjacent excitation intensities. These are (b) 0.4/0.15 μW, (c) 3.6/1.4 μW and (d) 115/90 μW. Scale bar represents 50 μm. Z scale represents the relative difference in point-to-point variation on the sample surface.