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. 2022 Aug 19;13:4890. doi: 10.1038/s41467-022-32029-1

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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 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 Normalized phosphorescence spectra of EtCz in PVA film under ambient conditions (top) and in m-THF (1 × 10⁻⁵M) at 77 K (bottom). b Phosphorescence lifetimes and efficiencies of CzA and EtCz in PVA films. c ¹H NMR spectra of the emitters within/without PVA matrix at 293 K. d Partial NOESY NMR spectrum of CzA/PVA in DMSO-d₆ at 293 K. e A conceivable mechanism for UOP of the emitters in PVA film.