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Here, by simply calcinating the mixture of m\u2010phenylenediamine and MgF\n                    <jats:sub>2<\/jats:sub>\n                    at 300\u2013500 \u00b0C, a series of CDs@MgF\n                    <jats:sub>2<\/jats:sub>\n                    composites exhibiting yellow, white, and ultraviolet\u2010blue TADF with high photoluminescence quantum yields of up to 37.6% are prepared. Photophysical studies reveal that the yellow TADF with long lifetimes of 810\u20131106\u00a0ms originates from the surface emission centers of CDs, while the ultraviolet\u2010blue TADF with short lifetimes of 266\u2013379\u00a0ms is related to the carbon core emission centers. The combination of yellow and ultraviolet\u2010blue TADF in a single material triggers dynamic afterglow with time\u2010dependent colors from white to yellow. The MgF\n                    <jats:sub>2<\/jats:sub>\n                    matrix offers multiple confinement of CDs through a rigid network, strong space constraint, and robust covalent\/hydrogen bonding, thus preventing the triplet excitations from non\u2010radiative transitions. The electron\u2010withdrawing fluorine atoms induce substantial spin\u2010orbit coupling and reduce the singlet\u2010triplet energy gap, consequently facilitating the reverse intersystem crossing to enhance TADF efficiency. Importantly, the CDs@MgF\n                    <jats:sub>2<\/jats:sub>\n                    composites possess outstanding optical stability against water, organic solvents, strong acids, bases, and oxidants. The fascinating TADF features enable the successful demonstration of multilevel information encryption using CDs@MgF\n                    <jats:sub>2<\/jats:sub>\n                    .\n                  <\/jats:p>","DOI":"10.1002\/smll.202407170","type":"journal-article","created":{"date-parts":[[2024,10,31]],"date-time":"2024-10-31T04:37:06Z","timestamp":1730349426000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Calcination\u2010Controlled Synthesis of Carbon Dots@MgF\n                    <sub>2<\/sub>\n                    Composites with Yellow, White, and Ultraviolet\u2010Blue Thermally Activated Delayed Fluorescence for Multilevel Information Encryption"],"prefix":"10.1002","volume":"21","author":[{"given":"Mingyu","family":"Xin","sequence":"first","affiliation":[{"name":"School of Materials Science and Chemical Engineering Ningbo University  Ningbo 315211 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