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Here, we report a photostable, metal ion (M\n                    <jats:sup>n+<\/jats:sup>\n                    )\u2010tunable luminescent DES platform driven by the in situ formation of zero\u2010dimensional (0D) halometallates stabilized within a designed hydrogen bond network. Combinatorial screening of hydrogen bond acceptors and donors identifies an efficient pair for stabilizing highly emissive 0D chloroplumbate(II) complexes under ambient conditions, achieving a PL quantum yield (PLQY) of 60.2%. Moreover, this DES matrix generates versatile emission with customizable excitation and emission wavelengths, PL lifetimes, and PLQYs by accommodating other M\n                    <jats:sup>n+<\/jats:sup>\n                    s, including the lanthanides Eu\n                    <jats:sup>3+<\/jats:sup>\n                    and Tb\n                    <jats:sup>3+<\/jats:sup>\n                    . Integrating these functional DESs into polymer networks yielded mechanically robust, luminescent eutectogels. By exploiting the independent emissive channels of these soft materials, we successfully constructed a highly multiplexed optical anti\u2010counterfeiting platform. This systematic work provides insights into the use of DESs as highly dynamic, functional matrices that directly govern the microenvironments for dopant coordination and speciation, leading to the discovery of emergent properties of materials.\n                  <\/jats:p>","DOI":"10.1002\/advs.76012","type":"journal-article","created":{"date-parts":[[2026,6,4]],"date-time":"2026-06-04T15:15:18Z","timestamp":1780586118000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["In Situ Confinement of 0D Halometallates Within Deep Eutectic Solvents: From Systematic Screening to Metal\u2010Tunable Luminescence for Anti\u2010Counterfeiting Eutectogels"],"prefix":"10.1002","volume":"13","author":[{"given":"Jeesu","family":"Moon","sequence":"first","affiliation":[{"name":"Department of Materials Science and Engineering Korea University  Seongbuk\u2010gu Seoul South 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