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. 2019 Dec 3;10:5502. doi: 10.1038/s41467-019-13505-7

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© The Author(s) 2019

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. 4 — Photoluminescence spectroscopy measurements. a Steady-state and (b–d) transient photoluminescence of films upon 400 nm excitation (The shaded areas in a indicate the spectral regions wherein PL dynamics were investigated in b–d). The steady state spectra of the DFP-4T system are virtually identical in both cases (a), but a quicker decay of the main emission in the transients of MB/DFP-4T points to a charge transfer towards MB (b). The DFPCO-4T system shows a marked increase in the PL around 750 nm upon MB deposition. The main emission occurs slightly faster c for MB/DFPCO-4T, but significantly slower in the tail region d.