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However, efficient and stable iodide VODPs with\n                    <jats:italic>n<\/jats:italic>\n                    s\n                    <jats:sup>2<\/jats:sup>\n                    metals as the lattice centers remain rare. Here, we develop\n                    <jats:italic>N<\/jats:italic>\n                    \u2010alkylated 1,4\u2010diazabicyclo[2.2.2]octane (dabco)\u2010derived diammonium cations Rdabco\n                    <jats:sup>2+<\/jats:sup>\n                    (R = Me, Et, or Pr; mono\u2010alkylated or\n                    <jats:italic>N<\/jats:italic>\n                    ,\n                    <jats:italic>N<\/jats:italic>\n                    \u2032\u2010dialkylated), to access iodide VODPs (Rdabco)\n                    <jats:sub>2<\/jats:sub>\n                    <jats:italic>B<\/jats:italic>\n                    \u25a1I\n                    <jats:sub>6<\/jats:sub>\n                    with\n                    <jats:italic>B<\/jats:italic>\n                    = Ge(II) or Sn(II). Varying the R group and alkylation across six cations effectively tunes the steric hindrance and lattice strain, enhancing oxidation tolerance and yielding zero\u2010dimensional lattices of isolated [\n                    <jats:italic>B<\/jats:italic>\n                    I\n                    <jats:sub>6<\/jats:sub>\n                    ]\n                    <jats:bold>\n                      <jats:sup>4<\/jats:sup>\n                    <\/jats:bold>\n                    <jats:sup>\u2212<\/jats:sup>\n                    octahedra. The materials exhibit bright room\u2010temperature STE emission with photoluminescence quantum yields (PLQYs) up to 35.0% for Ge and 36.8% for Sn. Notably, the highest PLQY of the Ge VODP is approximately seven times that of the highest reported Ge(II) iodide compounds. Structure\u2013photophysics correlations reveal distinct determinants: the Ge PLQYs correlate with [GeI\n                    <jats:sub>6<\/jats:sub>\n                    ]\n                    <jats:bold>\n                      <jats:sup>4<\/jats:sup>\n                    <\/jats:bold>\n                    <jats:sup>\u2212<\/jats:sup>\n                    octahedral distortion, whereas the Sn PLQYs reflect a more complex balance between radiative and nonradiative relaxation channels rather than a single distortion metric. These materials exhibit high ambient stability up to two months whereas the 3D perovskite analogs decompose within three days.\n                  <\/jats:p>","DOI":"10.1002\/anie.7126664","type":"journal-article","created":{"date-parts":[[2026,5,27]],"date-time":"2026-05-27T07:12:32Z","timestamp":1779865952000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Highly Emissive and Stable Ge(II)\u2010 and Sn(II)\u2010Based Vacancy\u2010Ordered Iodide Double Perovskites"],"prefix":"10.1002","volume":"65","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3592-3302","authenticated-orcid":false,"given":"Le","family":"Ye","sequence":"first","affiliation":[{"name":"Department of Chemistry Southern University of Science and Technology  Shenzhen China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yarou","family":"Duan","sequence":"additional","affiliation":[{"name":"Department of Chemistry Southern University of Science and Technology  Shenzhen China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jun","family":"Luo","sequence":"additional","affiliation":[{"name":"Department of Chemistry Southern University of Science and Technology  Shenzhen China"},{"name":"SUSTech Energy Institute for Carbon Neutrality Southern University of Science and Technology  Shenzhen China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yutong","family":"Lin","sequence":"additional","affiliation":[{"name":"Department of Chemistry Southern University of Science and Technology  Shenzhen China"},{"name":"SUSTech Energy Institute for Carbon Neutrality Southern University of Science and Technology  Shenzhen China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mengqiu","family":"Cai","sequence":"additional","affiliation":[{"name":"Hunan Provincial Key Laboratory of High\u2010Energy Scale Physics and Applications School of Physics and Electronics, Hunan University  Changsha China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3166-8559","authenticated-orcid":false,"given":"Lingling","family":"Mao","sequence":"additional","affiliation":[{"name":"Department of Chemistry Southern University of Science and Technology  Shenzhen China"},{"name":"SUSTech Energy Institute for Carbon Neutrality Southern University of Science and Technology  Shenzhen 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