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However, their development is hindered by the stringent symmetry requirements and the intrinsic coupling between polarization mechanisms and electronic structures. In this study, we propose a local symmetry\u2010breaking cascaded strategy, in which molecular\u2010level asymmetry is transmitted and amplified within a coordination framework to generate macroscopic ferroelectric polarization. Guided by this strategy, a new ferroelectric crystal, NH\n                    <jats:sub>3<\/jats:sub>\n                    CH\n                    <jats:sub>2<\/jats:sub>\n                    COO\u2219Li\n                    <jats:sub>2<\/jats:sub>\n                    SeO\n                    <jats:sub>4<\/jats:sub>\n                    , is obtained with the intrinsic asymmetry of glycine transmitted and amplified by high\u2010symmetry tetrahedral groups and small\u2010radius cations. This crystal exhibits a short ultraviolet cutoff edge (216\u00a0nm) and typical ferroelectricity (remanent polarization \u223c 8.4 \u00b5C\/cm\n                    <jats:sup>2<\/jats:sup>\n                    , coercive field \u223c 18.8\u00a0kV\/cm). Importantly, it further achieves the 266\u00a0nm output, validating its potential for solar\u2010blind ultraviolet nonlinear optical applications. Structural analysis and ferroelectric characterization reveal that the macroscopic polarization originates from local symmetry breaking of glycine units, which is transmitted and amplified through the Li\u2013SeO\n                    <jats:sub>4<\/jats:sub>\n                    coordination network. This mechanism provides a generalizable design principle for discovering ultraviolet ferroelectrics, opening a promising avenue toward high\u2010performance solar\u2010blind ultraviolet nonlinear optical materials.\n                  <\/jats:p>","DOI":"10.1002\/adma.74665","type":"journal-article","created":{"date-parts":[[2026,8,17]],"date-time":"2026-08-17T08:29:17Z","timestamp":1786955357000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Tailoring a Solar\u2010Blind Ultraviolet Ferroelectric for Nonlinear Optics Through a Local Symmetry\u2010Breaking Cascaded Strategy"],"prefix":"10.1002","volume":"38","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8559-2145","authenticated-orcid":false,"given":"Hongyuan","family":"Sha","sequence":"first","affiliation":[{"name":"Research Center for Crystal Materials, CAS Key Laboratory of Functional Materials and Devices for Special Environmental Conditions, Xinjiang Key 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