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However, the pure\u2010red\u2010targeted CsPbI\n                    <jats:sub>3<\/jats:sub>\n                    NCs generally suffer from imprecise synthetic control over emission wavelength and from structural instabilities that significantly diminish performance. We report a novel halogen engineering framework that addresses the otherwise unfavorable wavelength\u2010efficiency\u2010stability nexus. Our approach leverages surface I\n                    <jats:sup>\u2212<\/jats:sup>\n                    \u00b7\u00b7\u00b7I\n                    <jats:sub>2<\/jats:sub>\n                    interactions to simultaneously unlock exceptional optical characteristics and the elusive structural robustness needed for application. It achieves: (i) controlled quantum\u2010confinement\u2010tuned emission wavelength, (ii) near\u2010unity photoluminescence (PL) quantum yield through iodide vacancy defect management, and (iii) excellent environmental stability, even under harsh (85\u00b0C\/85%) temperature and humidity conditions, through lattice\u2010distortion suppression. Rec. 2020 compliant, 638 nm peak light\u2010emitting diodes (LEDs) are then demonstrated with Commission Internationale de l'\u00c9clairage coordinates (X, Y) = (0.703, 0.297), 22% external quantum efficiency, luminance \u2265 11,000 cd m\n                    <jats:sup>\u22122<\/jats:sup>\n                    , and long lifetime, establishing a materials\u2010by\u2010design paradigm for advancing next\u2010generation perovskite display technologies.\n                  <\/jats:p>","DOI":"10.1002\/adma.74435","type":"journal-article","created":{"date-parts":[[2026,8,4]],"date-time":"2026-08-04T13:11:06Z","timestamp":1785849066000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Halogen\u2010Bonding\u2010Assisted Synthesis of CsPbI\n                    <sub>3<\/sub>\n                    Perovskite Nanocrystal Emission Materials for Stable and Efficient Pure\u2010Red LEDs"],"prefix":"10.1002","volume":"38","author":[{"given":"Xin","family":"Zhang","sequence":"first","affiliation":[{"name":"School of Materials Science and Engineering University of Science and Technology Beijing  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yiyuan","family":"Tang","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering University of Science and Technology Beijing  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lvming","family":"Qiu","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering University of Science and Technology Beijing  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kaifeng","family":"Liao","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering University of Science and Technology Beijing  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6325-8178","authenticated-orcid":false,"given":"Chenghua","family":"Sun","sequence":"additional","affiliation":[{"name":"Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and Chemistry Chinese Academy of Sciences  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8713-5060","authenticated-orcid":false,"given":"Donal D. 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