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Here, the study employs luminescent p\u2010xylylenediammonium (PXA) instead of Cs\n                    <jats:sup>+<\/jats:sup>\n                    in Cs\n                    <jats:sub>2<\/jats:sub>\n                    NaInCl\n                    <jats:sub>6<\/jats:sub>\n                    to yield 2D Sb\n                    <jats:sup>3+<\/jats:sup>\n                    \u2010doped (PXA)\n                    <jats:sub>2<\/jats:sub>\n                    NaInCl\n                    <jats:sub>8<\/jats:sub>\n                    double perovskite and demonstrates a non\u2010degenerate triplet state resulting from enhanced JTE in the strong SOC regime, featuring distinct emission centers. Consequently, a broadband emission from both PXA and [SbCl\n                    <jats:sub>6<\/jats:sub>\n                    ]\n                    <jats:sup>3\u2212<\/jats:sup>\n                    spans the entire spectrum (350\u2013750\u00a0nm), representing a rare single\u2010source multi\u2010emissive 2D perovskite. With in\u2010depth comparative structural, temperature\u2010dependent photo\u2010physical, and theoretical studies, it is elucidated that the synergistic effect of SOC and JTE on the\n                    <jats:italic>\n                      E\n                      <jats:sub>g<\/jats:sub>\n                    <\/jats:italic>\n                    and\n                    <jats:italic>T<\/jats:italic>\n                    <jats:sub>\n                      2\n                      <jats:italic>g<\/jats:italic>\n                    <\/jats:sub>\n                    lattice modes modulate the electronic structure of [SbCl\n                    <jats:sub>6<\/jats:sub>\n                    ]\n                    <jats:sup>3\u2212<\/jats:sup>\n                    by splitting the doubly degenerate\n                    <jats:italic>E<\/jats:italic>\n                    levels of  into non\u2010degenerate states. The physical model, supported by theoretical studies, explains the energy level splitting required to realize two kinds of radiative minima in the relaxed excited state.\n                  <\/jats:p>","DOI":"10.1002\/adma.202509959","type":"journal-article","created":{"date-parts":[[2025,8,22]],"date-time":"2025-08-22T11:18:27Z","timestamp":1755861507000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Lifting Triplet Degeneracy Through Organic\u2010Cation Driven Structural Perturbation to Modulate Luminescence of Sb\n                    <sup>3+<\/sup>\n                    \u2010Doped Double Perovskite"],"prefix":"10.1002","volume":"37","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5627-7450","authenticated-orcid":false,"given":"Anuraj S","family":"Kshirsagar","sequence":"first","affiliation":[{"name":"Department of Chemistry Mississippi State University  Mississippi State MS 39762 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John Michael","family":"Lane","sequence":"additional","affiliation":[{"name":"Dave C. Swalm School of Chemical Engineering and Center for Advanced Vehicular Systems Mississippi State University  Mississippi State MS 39762 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rachel A","family":"Cooper","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering University of California  Berkeley CA 94720 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bruno","family":"Donnadieu","sequence":"additional","affiliation":[{"name":"Department of Chemistry Mississippi State University  Mississippi State MS 39762 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0058-9623","authenticated-orcid":false,"given":"Neeraj","family":"Rai","sequence":"additional","affiliation":[{"name":"Dave C. 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