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However, their photoluminescence (PL) efficiency and imaging resolution are limited by intrinsic defects that induce non-radiative recombination and strong exciton\u2013phonon coupling. In this work, millimeter-scale Cd2+-doped Cs3Cu2I5 single crystals were prepared via a room-temperature solvent-assisted evaporation method. Heterovalent Cd2+ doping effectively suppressed non-radiative recombination and facilitated the radiative relaxation of self-trapped excitons (STEs). Temperature-dependent PL analysis revealed a reduction in the Huang-Rhys factor from 44.56 to 37.23, indicating weakened exciton\u2013phonon coupling. As a result, the photoluminescence quantum yield (PLQY) increased from 84.6 to 96.2%. First-principles calculations revealed that Cd2+ doping altered the local electronic environment via a heterovalent charge-compensation mechanism. Furthermore, scintillator films fabricated from the doped single crystals demonstrated a spatial resolution of 26.5 lp\/mm at MTF = 0.2, representing competitive imaging performance among reported copper-based halide scintillators. This work provides an effective heterovalent doping strategy for improving the luminescence and imaging performance of copper-based halide scintillators and offers useful insights into the influence of heterovalent doping on STE-mediated radiative processes.<\/jats:p>","DOI":"10.1021\/acsami.6c14689","type":"journal-article","created":{"date-parts":[[2026,9,27]],"date-time":"2026-09-27T22:01:33Z","timestamp":1790546493000},"page":"53666-53676","source":"Crossref","is-referenced-by-count":0,"title":["Heterovalent Cd2+-Doped Cs3Cu2I5 Scintillators with Modulated Exciton\u2013Phonon Coupling for High-Resolution X-ray Imaging"],"prefix":"10.1021","volume":"18","author":[{"given":"Xiaonan","family":"Hu","sequence":"first","affiliation":[{"name":"Fuzhou University , , ,","place":["Fuzhou, China, 350108"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yingmiao","family":"Lin","sequence":"additional","affiliation":[{"name":"Fuzhou University , , ,","place":["Fuzhou, China, 350108"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gaolei","family":"Dong","sequence":"additional","affiliation":[{"name":"Fuzhou University , , ,","place":["Fuzhou, China, 350108"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hao","family":"Yan","sequence":"additional","affiliation":[{"name":"Fuzhou University , , ,","place":["Fuzhou, China, 350108"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1333-1864","authenticated-orcid":true,"given":"Chunlin","family":"Zhao","sequence":"additional","affiliation":[{"name":"Fuzhou University , , ,","place":["Fuzhou, China, 350108"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2173-1086","authenticated-orcid":true,"given":"Xiao","family":"Wu","sequence":"additional","affiliation":[{"name":"Fuzhou University , , ,","place":["Fuzhou, China, 350108"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiangdong","family":"Huang","sequence":"additional","affiliation":[{"name":"Fuzhou University , , ,","place":["Fuzhou, China, 350108"]},{"name":"Fujian Ceravite Technology Co., Ltd. , ,","place":["Fuzhou, China, 350002"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8063-3753","authenticated-orcid":true,"given":"Min","family":"Gao","sequence":"additional","affiliation":[{"name":"Fuzhou University , , ,","place":["Fuzhou, China, 350108"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4926-2776","authenticated-orcid":true,"given":"Cong","family":"Lin","sequence":"additional","affiliation":[{"name":"Fuzhou University , , ,","place":["Fuzhou, China, 350108"]},{"name":"State Key Laboratory of Green and Efficient Development of Phosphorus Resources , ,","place":["Wuhan, China, 430205"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,9,27]]},"reference":[{"key":"2026100705071409300_cit1","doi-asserted-by":"publisher","first-page":"155","DOI":"10.1016\/j.mattod.2021.01.028","article-title":"Halide perovskites for high-performance X-ray detector","volume":"48","author":"Li","year":"2021","journal-title":"Mater. 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