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In this work, coordination with Ln\n                    <jats:sup>3+<\/jats:sup>\n                    ions endows the resulting compounds\n                    <jats:bold>\n                      LnAgP\n                      <jats:sub>3<\/jats:sub>\n                    <\/jats:bold>\n                    (Ln = Gd\/Eu\/Y) with pronounced photoluminescence. Temperature\u2010dependent emission spectra and decay lifetime measurements reveal that Y\n                    <jats:sup>3+<\/jats:sup>\n                    and Gd\n                    <jats:sup>3+<\/jats:sup>\n                    incorporation induces distinct TADF activity in the [AgP\n                    <jats:sub>3<\/jats:sub>\n                    ] moiety. In\n                    <jats:bold>\n                      EuAgP\n                      <jats:sub>3<\/jats:sub>\n                    <\/jats:bold>\n                    , combined the experimental results supports efficient energy transfer from [AgP\n                    <jats:sub>3<\/jats:sub>\n                    ] to Eu\n                    <jats:sup>3+<\/jats:sup>\n                    via both singlet energy transfer (SET) and triplet energy transfer (TET) pathways. Modulating the Eu:Gd molar ratio within a lattice enables precise control over the TADF performance of the [AgP\n                    <jats:sub>3<\/jats:sub>\n                    ] unit. At a Eu:Gd ratio of 0.5:0.5, optimal TADF performance of the [AgP\n                    <jats:sub>3<\/jats:sub>\n                    ] moiety is observed with a larger\n                    <jats:italic>k<\/jats:italic>\n                    (S\n                    <jats:sub>1<\/jats:sub>\n                    \u2192S\n                    <jats:sub>0<\/jats:sub>\n                    ) value of 1.05 \u00d7 10\n                    <jats:sup>7<\/jats:sup>\n                    s\n                    <jats:sup>\u22121<\/jats:sup>\n                    and a shorter TADF decay time of 6.45 \u00b5s. Theoretical calculations further reveal that the SOC of the 4\n                    <jats:italic>f<\/jats:italic>\n                    orbitals perturbs the electronic structure of [AgP\n                    <jats:sub>3<\/jats:sub>\n                    ], compressing \u0394\n                    <jats:italic>E<\/jats:italic>\n                    (S\n                    <jats:sub>1<\/jats:sub>\n                    \u2010T\n                    <jats:sub>1<\/jats:sub>\n                    ) to &lt;0.2\u00a0eV, which enables reverse intersystem crossing (RISC) and thus TADF. Consequently, varying the Eu:Gd ratio provides an indirect handle over the SOC\u2010mediated Ag\u2194Eu energy\u2010transfer pathway, offering an effective route to regulate the TADF performance of the [AgP\n                    <jats:sub>3<\/jats:sub>\n                    ] moiety.\n                  <\/jats:p>","DOI":"10.1002\/anie.202525030","type":"journal-article","created":{"date-parts":[[2026,2,21]],"date-time":"2026-02-21T08:57:56Z","timestamp":1771664276000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Spin\u2010Orbit Coupling of Ln\n                    <sup>3+<\/sup>\n                    Induces and Modulates Thermally Activated Delayed Fluorescence in Heterometallic LnAgP\n                    <sub>3<\/sub>\n                    Clusters"],"prefix":"10.1002","volume":"65","author":[{"given":"Sheng\u2010Rong","family":"He","sequence":"first","affiliation":[{"name":"Institutes of Physical Science and Information Technology, Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education Anhui University  Hefei P.R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xue\u2010Ting","family":"Wang","sequence":"additional","affiliation":[{"name":"Institutes of Physical Science and Information Technology, Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education Anhui University  Hefei P.R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fang\u2010Wen","family":"Lv","sequence":"additional","affiliation":[{"name":"Institutes of Physical Science and Information Technology, Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education Anhui University  Hefei P.R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lingyun","family":"Cao","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry College of Chemistry and Chemical Engineering Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM) Xiamen University  Xiamen P.R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gui\u2010Lin","family":"Zhuang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Functional Molecular Solids Ministry of Education, College of Chemistry and Materials Science Anhui Normal University  Wuhu P.R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4016-9519","authenticated-orcid":false,"given":"Xiu\u2010Ying","family":"Zheng","sequence":"additional","affiliation":[{"name":"Institutes of Physical Science and Information Technology, Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education Anhui University  Hefei P.R. 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