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However, achieving spectrally isolated multi\u2010channel emission within a single matrix remains a daunting challenge. Herein, we demonstrate a single matrix platform using Cs\n                    <jats:sub>2<\/jats:sub>\n                    NaTbCl\n                    <jats:sub>6<\/jats:sub>\n                    : Eu\n                    <jats:sup>3+<\/jats:sup>\n                    double perovskite that enables excitation\u2010programmable multicolor switching through orthogonal optical activation of Tb\n                    <jats:sup>3+<\/jats:sup>\n                    and Eu\n                    <jats:sup>3+<\/jats:sup>\n                    centers. This monolithic system exhibits dominant green emission (Tb\n                    <jats:sup>3+<\/jats:sup>\n                    :\n                    <jats:sup>5<\/jats:sup>\n                    D\n                    <jats:sub>4<\/jats:sub>\n                    \u2192\n                    <jats:sup>7<\/jats:sup>\n                    F\n                    <jats:sub>5, 6<\/jats:sub>\n                    ) under 275 nm excitation, while selective red emission (Eu\n                    <jats:sup>3+<\/jats:sup>\n                    :\n                    <jats:sup>5<\/jats:sup>\n                    D\n                    <jats:sub>0<\/jats:sub>\n                    \u2192\n                    <jats:sup>7<\/jats:sup>\n                    F\n                    <jats:sub>1, 2<\/jats:sub>\n                    ) under 310 nm excitation, and distinct yellow emission under 275\/310 nm co\u2010stimulation. This unique behavior arises from well\u2010separated excitation pathways, weak interionic interactions, and suppressed concentration quenching via the large Spacing of rare earth ions and low phonon energy. Leveraging this unique single\u2010host multiplexing capability, we develop a wavelength\u2010division multiplexing PUF (WDM\u2010PUF) featuring simplified information carriers, unprecedented encoding dimensions, and a near\u2010zero false negative rate through RGY\/octal spectral\u2010channel encoding. Its flexible encoding method and operational simplicity enable its application in color image encryption and programmable information transmission, along with smartphone\u2010compatible authentication functionality. Our work establishes a new paradigm in optical encryption with wavelength\u2010multiplexed capacity in a single emissive platform, opening avenues for ultra\u2010secure anti\u2010counterfeiting technologies.\n                  <\/jats:p>","DOI":"10.1002\/adma.202515271","type":"journal-article","created":{"date-parts":[[2026,2,18]],"date-time":"2026-02-18T05:37:01Z","timestamp":1771393021000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Wavelength\u2010Multiplexed PUFs Through Single\u2010Host Multicolor Switching in Cs\n                    <sub>2<\/sub>\n                    NaTbCl\n                    <sub>6<\/sub>\n                    : Eu\n                    <sup>3+<\/sup>\n                    Double Perovskites"],"prefix":"10.1002","volume":"38","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7416-955X","authenticated-orcid":false,"given":"Yuhan","family":"Jing","sequence":"first","affiliation":[{"name":"Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission School of Physics and Materials Engineering Dalian Minzu University  Dalian P. 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