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However, simultaneously achieving high-sensitivity fluorescence thermometry and efficient space radiative cooling remains challenging, as enhanced visible absorption improves thermometric response but increases solar heating. Here, we address this trade-off through a material-structure co-design strategy by developing an Eu-doped ZrO\n                    <jats:sub>2<\/jats:sub>\n                    submicrosphere metacoating that integrates space radiative cooling with fluorescence-based temperature sensing. Guided by photonic-structure optimization using a constrained-gradient optimizer combined with grid-search mapping, the optimized metacoating, featuring a submicrosphere diameter of 0.756\u00a0\u00b5m and a volume fraction of 35%, achieves an ultralow solar absorptance (\n                    <jats:italic>\u03b1<\/jats:italic>\n                    <jats:sub>\n                      <jats:italic>s<\/jats:italic>\n                    <\/jats:sub>\n                    \u2009=\u20090.076) and a high thermal emittance (\n                    <jats:italic>\u03b5<\/jats:italic>\n                    \u2009=\u20090.931). In parallel, bandgap-driven compositional optimization identifies an optimal Eu content of 8.48%, enabling outstanding thermometric performance. The metacoating delivers a net cooling power of 323.69\u00a0W\u00a0m\n                    <jats:sup>\u22122<\/jats:sup>\n                    and a 77\u00a0\u00b0C temperature reduction relative to an Al sheet, outperforming representative oxide-based inorganic coatings. It allows temperature sensing over 173\u2013433\u00a0K with a maximum relative sensitivity of 0.797%\u00a0K\n                    <jats:sup>\u22121<\/jats:sup>\n                    , surpassing fluorescent oxides with comparable absorption edges. Moreover, the metacoating maintains the lowest\n                    <jats:italic>\u03b1<\/jats:italic>\n                    <jats:sub>\n                      <jats:italic>s<\/jats:italic>\n                    <\/jats:sub>\n                    and reliable irradiation resistance under proton, electron, atomic oxygen and ultraviolet exposures, outperforming reported counterparts. Together with its scalable fabrication, this work establishes a dual-functional metacoating platform for intelligent spacecraft thermal management that combines efficient radiative cooling with high-sensitivity fluorescence thermometry.\n                  <\/jats:p>","DOI":"10.1007\/s40820-026-02195-8","type":"journal-article","created":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T06:46:10Z","timestamp":1777445170000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Dual-Functional Photonic Metacoating Integrating Fluorescence Thermometry and High-Performance Space Radiative Cooling"],"prefix":"10.1007","volume":"18","author":[{"given":"Hao","family":"Gong","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhongyang","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yan","family":"Zheng","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Liping","family":"Tong","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hongchao","family":"Li","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhiyuan","family":"Zhao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Junjia","family":"Liu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gang","family":"Liu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiao","family":"Zhou","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tongxiang","family":"Fan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,4,29]]},"reference":[{"issue":"11","key":"2195_CR1","doi-asserted-by":"publisher","first-page":"1016","DOI":"10.1038\/s41928-025-01476-1","volume":"8","author":"A Aili","year":"2025","unstructured":"A. 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