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It is important to explore advanced anti\u2010counterfeiting fluorescent labels with high\u2010level security. Here, a pioneering ion species\u2010 and ion concentration\u2010dependent anti\u2010counterfeiting technique is developed. By successive loading Cu<jats:sup>2+<\/jats:sup>\u2010sensitive yellow emitted carbon dots (Y\u2010CDs) and Cu<jats:sup>2+<\/jats:sup> non\u2010sensitive blue emitted carbon dots (B\u2010CDs) into metal\u2010organic frameworks (MOFs) and followed by electrospinning, the B&amp;Y\u2010CDs@MOF\u2010nanofibrous films are prepared. The results show that the use of MOF not only avoids the fluorescence quenching of CDs but also improves the fluorescence stability. The fluorescence Cu<jats:sup>2+<\/jats:sup>\u2010sensitivity of the CDs@MOF\u2010nanofibrous films can be regulated by polymer coating or lamination. The fluorescent label consisting of different Cu<jats:sup>2+<\/jats:sup>\u2010sensitivity films will show Cu<jats:sup>2+<\/jats:sup> concentration\u2010dependent decryption information. Only at a specific ion species and concentration (Cu<jats:sup>2+<\/jats:sup> solution of 40\u201390\u00a0\u00b5<jats:sc>m<\/jats:sc>), the true information can be read out. Less or more concentration (&lt;40 or &gt;90\u00a0\u00b5<jats:sc>m<\/jats:sc>) will lead to false information. The identification of the real information depends on both the species and the concentration. After Cu<jats:sup>2+<\/jats:sup> treatment, the fluorescence of the label can be recovered by ethylenediaminetetraacetic acid disodium (EDTA\u20102Na) for further recycling. This work will open up a new door for designing high\u2010level fluorescent anti\u2010counterfeiting labels.<\/jats:p>","DOI":"10.1002\/smll.202305211","type":"journal-article","created":{"date-parts":[[2023,8,31]],"date-time":"2023-08-31T04:01:52Z","timestamp":1693454512000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":38,"title":["A Novel Ion Species\u2010 and Ion Concentration\u2010Dependent Anti\u2010Counterfeiting Based on Ratiometric Fluorescence Sensing of CDs@MOF\u2010Nanofibrous Films"],"prefix":"10.1002","volume":"20","author":[{"given":"Kaitian","family":"Zhao","sequence":"first","affiliation":[{"name":"School of Electronic Science &amp; Engineering Southeast University  Nanjing 210096 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fan","family":"Liu","sequence":"additional","affiliation":[{"name":"School of Electronic Science &amp; Engineering Southeast University  Nanjing 210096 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