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Although molecules with high photoluminescence properties under UV excitation are usually transplanted as scintillators for X\u2010ray detection, the development of scintillant materials is still far behind that of photoluminescent counterparts. Here, a hypothesis is proposed that chemical bond inversion induced by high\u2010energy radiation is a key factor responsible for the suppression of scintillation in organic materials. A \u201cmethyl lock\u201d strategy is presented to limit this inversion and successfully liberate its radioluminescence ability. As a result, 1,4\u2010bis(2\u2010methylstyryl)benzene (bis\u2010MSB) crystals with \u201cmethyl lock\u201d exhibit an 8.9\u2010fold increase in relative light output compared to 1,4\u2010distyrylbenzene (DSB) without \u201cmethyl lock,\u201d achieving a remarkably low minimum detectable dose rate of 14.9 nGy\u00a0s\n                    <jats:sup>\u22121<\/jats:sup>\n                    . The detector, based on bis\u2010MSB crystal scintillators, offers exceptional resolution (50\u00a0lp\u00a0mm\n                    <jats:sup>\u22121<\/jats:sup>\n                    ), enabling precise X\u2010ray imaging and computed tomography scanning. The distinct photo\u2010 and radio\u2010luminescence behaviors of bis\u2010MSB and DSB molecules make them promising materials for applications in information security and smart, multi\u2010level anti\u2010counterfeiting measures.\n                  <\/jats:p>","DOI":"10.1002\/smll.202504013","type":"journal-article","created":{"date-parts":[[2025,7,11]],"date-time":"2025-07-11T11:29:47Z","timestamp":1752233387000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Organic Crystals with Methyl Lock Effect for High\u2010Efficiency X\u2010Ray Scintillation and Advanced Anti\u2010Counterfeiting"],"prefix":"10.1002","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6620-8889","authenticated-orcid":false,"given":"Mingxi","family":"Chen","sequence":"first","affiliation":[{"name":"Key Laboratory of Organic Integrated Circuits Ministry of Education and Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of Chemistry School of Science Tianjin University  Tianjin 300072 P. 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