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. 2021 Nov 4;12:6401. doi: 10.1038/s41467-021-26701-1

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© The Author(s) 2021

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, b Lifetime images of green (a) and red (b) upconversion emission bands under different temperatures. c, d Normalized photoluminescence decay curves of green (c) and red (d) emission bands at different temperatures, averaged over the entire field of view. e Relationship between temperature and mean lifetimes of green and red emissions with linear fitting. Error bar: standard deviation from three independent measurements. f Normalized contrast versus chicken tissue thickness for green and red emission bands with single-component exponential fitting. g Longitudinal temperature monitoring through 0.5 mm-thick fresh chicken tissue.