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In this work, we demonstrate that B\u2010site heavier alkali metals can trigger a structural \u201cdomino effect\u201d in the layered perovskite derivative (C\n                    <jats:sub>4<\/jats:sub>\n                    H\n                    <jats:sub>14<\/jats:sub>\n                    N\n                    <jats:sub>2<\/jats:sub>\n                    S\n                    <jats:sub>2<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    Cs\n                    <jats:sub>2<\/jats:sub>\n                    InCl\n                    <jats:sub>9<\/jats:sub>\n                    , leading to spontaneous symmetry breaking and ultra\u2010broadband photoluminescence (PL) upon Sb\n                    <jats:sup>3<\/jats:sup>\n                    <jats:sup>+<\/jats:sup>\n                    doping. This unique \u201cdomino effect\u201d is initiated by the close packing of the faced\u2010tricapped trigonal prism CsCl\n                    <jats:sub>9<\/jats:sub>\n                    <jats:sup>8\u2212<\/jats:sup>\n                    within the 2D inorganic layer and propagates via the charge\u2010balancing interplay of intercalated chloride anions. The bonding of Cl\n                    <jats:sup>\u2212<\/jats:sup>\n                    with three amine groups of the biprotanated cystamine, in turn, asymmetrically influences the inorganic layer, resulting in the formation of two distinct indium chloride octahedra. Consequently, Sb\n                    <jats:sup>3<\/jats:sup>\n                    <jats:sup>+<\/jats:sup>\n                    doping enables ultra\u2010broadband visible emission through a distortion\u2010modulated cooperative dual\u2010site mechanism. Our findings establish B\u2010site\u2010driven phase transition as a powerful and heretofore overlooked strategy for developing high\u2010performance luminescent materials.\n                  <\/jats:p>","DOI":"10.1002\/smll.202514130","type":"journal-article","created":{"date-parts":[[2026,2,4]],"date-time":"2026-02-04T10:29:17Z","timestamp":1770200957000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Engineering Lattice Asymmetry via a Cs\n                    <sup>+<\/sup>\n                    \u2010Triggered Domino Effect for Ultra\u2010Broadband Visible Emission from a Single Sb\n                    <sup>3<\/sup>\n                    <sup>+<\/sup>\n                    Luminophore"],"prefix":"10.1002","volume":"22","author":[{"given":"Yuanyuan","family":"Wei","sequence":"first","affiliation":[{"name":"College of Chemistry and Chemical Engineering Southwest University  Chongqing P. R. 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