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Here, we propose a buried\u2010carbon reduction concept that enables precise regulation of Eu valence states through controlled carbon burial depth from a single precursor, thereby unlocking multifunctionality within one material system. By such strategy, fully reduced SrMgAl\n                    <jats:sub>10<\/jats:sub>\n                    O\n                    <jats:sub>17<\/jats:sub>\n                    :Eu\n                    <jats:sup>2+<\/jats:sup>\n                    is utilized in x\u2010ray detection and imaging. High\u2010energy irradiation activates defect\u2010mediated electron release, substantially increasing the effective concentration of luminescent centers. Remarkably, its radioluminescence intensity retains 117.5% after over 150 on\u2010off irradiation cycles, showing a long\u2010term working light yield of up to 55917 \u00b1 573 photons MeV\n                    <jats:sup>\u22121<\/jats:sup>\n                    , together with excellent linear dose response and a low detection limit. Flexible scintillator films achieve a spatial resolution of 11.7 lp mm\n                    <jats:sup>\u22121<\/jats:sup>\n                    (at 20% MTF). These characteristic makes the material with low cost, flexibility, environmental protection, chemically stable, and excellent radiation resistance. Moreover, partially reduced SrMgAl\n                    <jats:sub>10<\/jats:sub>\n                    O\n                    <jats:sub>17<\/jats:sub>\n                    :Eu\n                    <jats:sup>2+<\/jats:sup>\n                    \/Eu\n                    <jats:sup>3+<\/jats:sup>\n                    exhibits rare multimodal synergistic optical thermometry performance in the high\u2010temperature region owing to distinct thermal quenching behaviors. In the temperature range of 550\u2013625 K, the FIR\u2010based S\n                    <jats:sub>a<\/jats:sub>\n                    and S\n                    <jats:sub>r<\/jats:sub>\n                    reach 0.226 K\n                    <jats:sup>\u22121<\/jats:sup>\n                    and 0.97 %K\n                    <jats:sup>\u22121<\/jats:sup>\n                    , respectively; the FWHM\u2010based thermometric mode achieves a maximum sensitivity of 0.238\u00a0nm\/K, while also enabling visual discrimination of the temperature. This work establishes a versatile concept for designing advanced optical materials for radiation detection and temperature sensing.\n                  <\/jats:p>","DOI":"10.1002\/adma.75153","type":"journal-article","created":{"date-parts":[[2026,9,27]],"date-time":"2026-09-27T07:14:32Z","timestamp":1790493272000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Atmosphere\u2010Controlled Valence Engineering of Eu in Aluminate Crystals Enabling High\u2010Performance Temperature Sensing and Flexible X\u2010Ray Imaging"],"prefix":"10.1002","author":[{"given":"Ci'an","family":"Xie","sequence":"first","affiliation":[{"name":"Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources, National Laboratory of Mineral Materials, Hebei Key Laboratory of Resource Low\u2010Carbon Utilization and New Materials, School of Materials Science and Technology China University of Geosciences  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8148-1699","authenticated-orcid":false,"given":"Yan\u2010gai","family":"Liu","sequence":"additional","affiliation":[{"name":"Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources, National Laboratory of Mineral Materials, Hebei Key Laboratory of Resource Low\u2010Carbon Utilization and New Materials, School of Materials Science and Technology China University of Geosciences  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1420-2351","authenticated-orcid":false,"given":"Lefu","family":"Mei","sequence":"additional","affiliation":[{"name":"Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources, National Laboratory of Mineral Materials, Hebei Key Laboratory of Resource Low\u2010Carbon Utilization and New Materials, School of Materials Science and Technology China University of Geosciences  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chenguang","family":"Yang","sequence":"additional","affiliation":[{"name":"Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources, National Laboratory of Mineral Materials, Hebei Key Laboratory of Resource Low\u2010Carbon Utilization and New Materials, School of Materials Science and Technology China University of Geosciences  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yukun","family":"Liu","sequence":"additional","affiliation":[{"name":"Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources, National Laboratory of Mineral Materials, Hebei Key Laboratory of Resource Low\u2010Carbon Utilization and New 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University of Geosciences  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Liming","family":"Wu","sequence":"additional","affiliation":[{"name":"Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources, National Laboratory of Mineral Materials, Hebei Key Laboratory of Resource Low\u2010Carbon Utilization and New Materials, School of Materials Science and Technology China University of Geosciences  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zekun","family":"Wang","sequence":"additional","affiliation":[{"name":"Tianmushan Laboratory Beihang University  Hangzhou China"},{"name":"School of Materials Science and Engineering Beihang University  Beijing 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