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However, their emission efficiencies remain significantly lower than those of zero\u2010dimensional analogues. Herein, we propose a ligand\u2010confinement strategy that employs sterically hindered, electronically tuned pyrimidine\u2010based bridging ligands to simultaneously boost x\u2010ray excited luminescence (XEL) and accelerate decay dynamics in 1D Cu\u2013I cluster scintillators. Rigid, compact bidentate ligands increase structural rigidity while reducing the organic fraction for enhanced x\u2010ray absorption. Meanwhile, asymmetric substituents induce coupled spatial and electronic confinement, giving rise to quantum\u2010wire\u2010like electronic states that promote radiative transitions. As a result,\n                    <jats:bold>CuI(4\u2010Mepym)<\/jats:bold>\n                    exhibits a six\u2010fold enhancement in photoluminescence quantum yield compared to\n                    <jats:bold>CuI(2\u2010Mepym)<\/jats:bold>\n                    , together with a fast decay lifetime of 1.28\u00a0\u00b5s, surpassing most reported copper(I) iodide cluster complexes. Combined with high stability, good solution processability, and a light yield comparable to commercial LuAG:Ce (\u223c25\u00a0000\u00a0ph MeV\n                    <jats:sup>\u22121<\/jats:sup>\n                    ),\n                    <jats:bold>CuI(4\u2010Mepym)<\/jats:bold>\n                    breaks the conventional brightness\u2013speed trade\u2010off and enables high\u2010resolution static imaging (&gt;20\u00a0lp mm\n                    <jats:sup>\u22121<\/jats:sup>\n                    ), artifact\u2010free dynamic x\u2010ray imaging, and high\u2010fidelity 3D tomography. This work establishes ligand confinement as an effective design principle for developing high\u2010brightness, fast\u2010decay 1D Cu\u2013I cluster scintillators for advanced x\u2010ray imaging applications.\n                  <\/jats:p>","DOI":"10.1002\/anie.9375909","type":"journal-article","created":{"date-parts":[[2026,2,18]],"date-time":"2026-02-18T05:32:46Z","timestamp":1771392766000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Ligand Confinement for Fast\u2010Decay Cu\u2500I Chain Scintillators Enabling High\u2010Resolution X\u2010ray Imaging and 3D Tomography"],"prefix":"10.1002","volume":"65","author":[{"given":"Qian","family":"Cao","sequence":"first","affiliation":[{"name":"State Key Laboratory of Flexible Electronics (LoFE) &amp; Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials (IAM) Nanjing University of Posts &amp; Telecommunications  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Junjie","family":"Ye","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Flexible Electronics (LoFE) &amp; Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials (IAM) Nanjing University of Posts &amp; Telecommunications  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Le","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Flexible Electronics (LoFE) &amp; Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials (IAM) Nanjing University of Posts &amp; Telecommunications  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nianshu","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Flexible Electronics (LoFE) &amp; Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials (IAM) Nanjing University of Posts &amp; Telecommunications  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6766-5547","authenticated-orcid":false,"given":"Kang","family":"Xiao","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Flexible Electronics (LoFE) &amp; Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials (IAM) Nanjing University of Posts &amp; Telecommunications  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yongkang","family":"Zhu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Flexible Electronics (LoFE) &amp; Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials (IAM) Nanjing University of Posts &amp; Telecommunications  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1854-7026","authenticated-orcid":false,"given":"Mingli","family":"Liang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Flexible Electronics (LoFE) &amp; Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials (IAM) Nanjing University of Posts &amp; Telecommunications  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shujuan","family":"Liu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Flexible Electronics (LoFE) &amp; Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials (IAM) Nanjing University of Posts &amp; Telecommunications  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6463-0114","authenticated-orcid":false,"given":"Xiangmei","family":"Liu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Flexible Electronics (LoFE) &amp; Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials (IAM) Nanjing University of Posts &amp; Telecommunications  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3788-4757","authenticated-orcid":false,"given":"Qiang","family":"Zhao","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Flexible Electronics (LoFE) &amp; Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials (IAM) Nanjing University of Posts &amp; Telecommunications  Nanjing China"},{"name":"College of Electronic and Optical Engineering &amp; College of Flexible Electronics (Future Technology) Nanjing University of Posts and Telecommunications  Nanjing China"},{"name":"School of Physics and Optoelectronic Engineering Nanjing University of Information Science &amp; Technology  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,2,17]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41586\u2010021\u201003251\u20106"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41563\u2010021\u201001132\u2010x"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41566\u2010022\u201001092\u2010x"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.3390\/ma17164016"},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.1109\/23.682433"},{"key":"e_1_2_7_7_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41586\u2010018\u20100451\u20101"},{"key":"e_1_2_7_8_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.201801743"},{"key":"e_1_2_7_9_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202102529"},{"key":"e_1_2_7_10_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.nanolett.5c03109"},{"key":"e_1_2_7_11_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010020\u201018119\u2010y"},{"key":"e_1_2_7_12_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.201904711"},{"key":"e_1_2_7_13_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202502440"},{"key":"e_1_2_7_14_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41377\u2010023\u201001208\u20100"},{"key":"e_1_2_7_15_1","doi-asserted-by":"publisher","DOI":"10.1021\/acsenergylett.3c02050"},{"key":"e_1_2_7_16_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010023\u201038546\u2010x"},{"key":"e_1_2_7_17_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202308194"},{"key":"e_1_2_7_18_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202206741"},{"key":"e_1_2_7_19_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.chemmater.4c00020"},{"key":"e_1_2_7_20_1","doi-asserted-by":"publisher","DOI":"10.1002\/adom.202302904"},{"key":"e_1_2_7_21_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.chempr.2024.102401"},{"key":"e_1_2_7_22_1","doi-asserted-by":"publisher","DOI":"10.1002\/adfm.202400436"},{"key":"e_1_2_7_23_1","doi-asserted-by":"publisher","DOI":"10.1002\/adom.202200865"},{"key":"e_1_2_7_24_1","doi-asserted-by":"publisher","DOI":"10.1021\/ja507927a"},{"key":"e_1_2_7_25_1","doi-asserted-by":"publisher","DOI":"10.1002\/lpor.202400963"},{"key":"e_1_2_7_26_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.jpclett.4c01122"},{"key":"e_1_2_7_27_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.201405897"},{"key":"e_1_2_7_28_1","doi-asserted-by":"publisher","DOI":"10.1021\/ja202965y"},{"key":"e_1_2_7_29_1","doi-asserted-by":"publisher","DOI":"10.1039\/D4SC06242F"},{"key":"e_1_2_7_30_1","doi-asserted-by":"publisher","DOI":"10.1021\/cr960109i"},{"key":"e_1_2_7_31_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202504576"},{"key":"e_1_2_7_32_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.chemmater.0c03353"},{"key":"e_1_2_7_33_1","doi-asserted-by":"publisher","DOI":"10.1039\/D1DT00826A"},{"key":"e_1_2_7_34_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.chemmater.0c03984"},{"key":"e_1_2_7_35_1","doi-asserted-by":"publisher","DOI":"10.1021\/ja508155x"},{"key":"e_1_2_7_36_1","doi-asserted-by":"publisher","DOI":"10.1002\/adfm.202425349"},{"key":"e_1_2_7_37_1","doi-asserted-by":"publisher","DOI":"10.1021\/jacs.3c12296"},{"key":"e_1_2_7_38_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202509478"},{"key":"e_1_2_7_39_1","doi-asserted-by":"publisher","DOI":"10.1002\/lpor.202501179"},{"key":"e_1_2_7_40_1","doi-asserted-by":"publisher","DOI":"10.1021\/acsmaterialslett.4c00371"},{"key":"e_1_2_7_41_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.chemmater.1c04408"},{"key":"e_1_2_7_42_1","doi-asserted-by":"publisher","DOI":"10.1039\/C4CE01231C"},{"key":"e_1_2_7_43_1","doi-asserted-by":"publisher","DOI":"10.1021\/ic00217a048"},{"key":"e_1_2_7_44_1","doi-asserted-by":"publisher","DOI":"10.1002\/advs.202414970"},{"key":"e_1_2_7_45_1","doi-asserted-by":"publisher","DOI":"10.1039\/C8TC05020A"},{"key":"e_1_2_7_46_1","unstructured":"M. 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