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However, the structure\u2013property relationship remains elusive, and their practical viability for X\u2010ray imaging is largely unverified. In this work, we employ a bond\u2011mode control strategy to synthesize two compounds from the same amine precursor: ionic (4\u2011ATHP)\n                    <jats:sub>2<\/jats:sub>\n                    CuI\n                    <jats:sub>3<\/jats:sub>\n                    and coordinative (4\u2011ATHP)\n                    <jats:sub>4<\/jats:sub>\n                    Cu\n                    <jats:sub>4<\/jats:sub>\n                    I\n                    <jats:sub>4<\/jats:sub>\n                    (4\u2010ATHP = 4\u2010Aminotetrahydropyran), providing a model system to study their photophysics and underlying mechanism. (4\u2011ATHP)\n                    <jats:sub>2<\/jats:sub>\n                    CuI\n                    <jats:sub>3<\/jats:sub>\n                    adopts a unique 1D crystal structure with alternating arrangement of Cu\n                    <jats:sub>2<\/jats:sub>\n                    I\n                    <jats:sub>6<\/jats:sub>\n                    dimers, which shows excitation\u2011dependent dual emissions. Experimental and calculation results indicate that the dual emissions originate from the Cu\n                    <jats:sub>2<\/jats:sub>\n                    I\n                    <jats:sub>6<\/jats:sub>\n                    dimer with a different Cu\u2500Cu bond length. In contrast, the (4\u2011ATHP)\n                    <jats:sub>4<\/jats:sub>\n                    Cu\n                    <jats:sub>4<\/jats:sub>\n                    I\n                    <jats:sub>4<\/jats:sub>\n                    shows single emission centered at 635\u00a0nm, in which the organic component contributes to the excited state. The ionic (4\u2011ATHP)\n                    <jats:sub>2<\/jats:sub>\n                    CuI\n                    <jats:sub>3<\/jats:sub>\n                    achieves a much higher light yield (55\u00a0923 photons\/MeV) than that of the coordinative counterpart (31\u00a0866 photons\/MeV). Furthermore, a large\u2011area flexible film (15 \u00d7 20\u00a0cm\n                    <jats:sup>2<\/jats:sup>\n                    ) based on (4\u2011ATHP)\n                    <jats:sub>2<\/jats:sub>\n                    CuI\n                    <jats:sub>3<\/jats:sub>\n                    delivers a spatial resolution of 20\u00a0lp\/mm. Critically, integrating this film into a CMOS imager demonstrates superior dynamic imaging without afterglow, outperforming the commercialized CsI: Tl screen. This study not only deciphers the bond\u2011mode\u2011dependent photophysics but also validates a commercial\u2011grade scintillator, paving the way for high\u2011performance X\u2011ray imaging materials.\n                  <\/jats:p>","DOI":"10.1002\/adma.202520967","type":"journal-article","created":{"date-parts":[[2026,2,5]],"date-time":"2026-02-05T05:38:17Z","timestamp":1770269897000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":20,"title":["Bond\u2010Mode Engineering in Copper(I) Halides: From Excitation\u2010Dependent Luminescence to High\u2010Resolution X\u2010Ray Imaging Screens"],"prefix":"10.1002","volume":"38","author":[{"given":"Haoyang","family":"Guan","sequence":"first","affiliation":[{"name":"Beijing Key Lab of Microstructure and Property of Advanced Materials College of Materials Science and Engineering College of Physics and Optoelectronics Engineering Beijing University of Technology  Beijing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Luxuan","family":"Men","sequence":"additional","affiliation":[{"name":"Beijing Key Lab of Microstructure and Property of Advanced Materials College of Materials Science and Engineering College of Physics and Optoelectronics Engineering Beijing University of Technology  Beijing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhuoer","family":"Cai","sequence":"additional","affiliation":[{"name":"School of Chemistry and Chemical Engineering Southeast University  Nanjing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yiping","family":"Du","sequence":"additional","affiliation":[{"name":"Beijing Key Lab of Microstructure and Property of Advanced Materials College of Materials Science and Engineering College of Physics and Optoelectronics Engineering Beijing University of Technology  Beijing P. R. 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