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. 2020 Apr 21;11:1925. doi: 10.1038/s41467-020-15681-3

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© The Author(s) 2020

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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Fig. 3 — a Time evolution of the delocalized exciton O in the non-polar cyclohexane as extracted from three different methods: Fluorescence up-conversion spectroscopy (FLUPS) emission (blue circles), IR excitonic S₂ ← S₁ transition (red triangles) and higher-energy NIR transition (peaking at 863 nm, green diamonds). The solid line is a biexponential fit to the FLUPS data shown with the time constants and their respective amplitudes. b FLUPS contour plots obtained for O and Q in the highly polar benzonitrile. The equidistant blue-shaded contours are drawn every 10% from zero (white) to the maximum intensity (dark blue). The time axis is linear between 0 and 1 ps and logarithmic afterwards. c Results of a global analysis of the FLUPS data according to a consecutive A → B → C → scheme representing the emission of three distinct species/states: delocalized unrelaxed exciton (red), localized exciton (blue) and allene photoproduct (black). Circles represent experimental data points, solid lines are lognormal fits. The fluorescence intensity of the localized exciton is 1/3 and 1/2 of the delocalized one for O and Q correspondingly.