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Here, we present a molecular decoupling strategy to overcome this dilemma, realized in a donor\u2013acceptor\u2013donor (D\u2013A\u2013D) hybridized local and charge\u2010transfer (HLCT) molecule, 4,7\u2010bis(4\u2010(bis(4\u2010iodophenyl)methyl)phenyl)benzo[\n                    <jats:italic>c<\/jats:italic>\n                    ][1,2,5]thiadiazole (TPBI). By terminally tethering iodine atoms to the triphenylamine units, we achieve robust X\u2010ray attenuation while preserving a fast \u201chot\u2010exciton\u201d emission channel. The intrinsic nonplanar geometry and strategic spatial arrangement of the molecule successfully isolate the heavy\u2010atom effect from the emissive core, maintaining the crucial quasi\u2010degeneracy between the T\n                    <jats:sub>2<\/jats:sub>\n                    and S\n                    <jats:sub>1<\/jats:sub>\n                    states. This configuration facilitates rapid high\u2010lying reverse intersystem crossing (hRISC), enabling near\u2010unity exciton utilization without compromising nanosecond\u2010scale decay kinetics. Our TPBI\u2010based scintillator demonstrates a synergized performance profile of potent X\u2010ray interaction (attenuation efficiency 5.672 cm\n                    <jats:sup>2<\/jats:sup>\n                    g\n                    <jats:sup>\u22121<\/jats:sup>\n                    at 28\u00a0keV) and a fast temporal response (2.96\u00a0ns), providing a general molecular design paradigm for next\u2010generation, high\u2010performance organic radiation detectors.\n                  <\/jats:p>","DOI":"10.1002\/anie.4586495","type":"journal-article","created":{"date-parts":[[2026,6,11]],"date-time":"2026-06-11T06:16:40Z","timestamp":1781158600000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Spatial Molecular Decoupling Design for High\u2010Z and Fast Organic Scintillators"],"prefix":"10.1002","volume":"65","author":[{"given":"Tingchang","family":"Shi","sequence":"first","affiliation":[{"name":"Engineering Research Center of Nano\u2010Geomaterials of Ministry of Education Faculty of Material Science and Chemistry China University of Geosciences  Wuhan China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shiyu","family":"Hou","sequence":"additional","affiliation":[{"name":"Engineering Research Center of Nano\u2010Geomaterials of Ministry of Education Faculty of Material Science and Chemistry China University of Geosciences  Wuhan China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bingyan","family":"Tu","sequence":"additional","affiliation":[{"name":"Research Institute of Huazhong University of Science and Technology Shenzhen  Shenzhen China"},{"name":"Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology  Wuhan China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-7784-9792","authenticated-orcid":false,"given":"Song","family":"He","sequence":"additional","affiliation":[{"name":"Research Institute of Huazhong University of Science and Technology Shenzhen  Shenzhen China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0163-4702","authenticated-orcid":false,"given":"Yue","family":"Hu","sequence":"additional","affiliation":[{"name":"School of Chemistry University of Edinburgh  Edinburgh UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9535-4076","authenticated-orcid":false,"given":"Wallace C. 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