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Here we uncover a previously unrecognized MPa\u2010level dynamic excimer\u2010switching mechanism in 9\u2010phenylanthracene (An\u2010Ph) microcrystals, enabled by pressure\u2010induced reorganization within pre\u2010associated\n                    <jats:italic>J<\/jats:italic>\n                    \u2010type columns. Under increasing pressure (0\u201040\u00a0MPa), the emission evolves from blue \u2192 white \u2192 intense cyan, accompanied by enhanced rather than quenched brightness. Upon pressure release, unstable excimer states dissipate, yet the material still exhibits bright white emission with a high quantum yield (67.2%) from a mixed monomer\u2013excimer output. A 3D chromaticity trajectory is introduced to precisely visualize monomer\u2013excimer conversions, revealing reversible optical pathways inaccessible to conventional CIE mapping. Single\u2010crystal analysis and molecular dynamics jointly elucidate the formation and relaxation of multiple Y\u2010 and X\u2010type excimer conformations under MPa\u2010level stresses. Finally, we demonstrate a recyclable, mechanically triggered self\u2010erasing QR\/Morse encryption system, highlighting the material's potential for dynamic, time\u2010gated security. This work establishes a general design framework for low\u2010pressure excimer activation and mechanically adaptive photonic materials.\n                  <\/jats:p>","DOI":"10.1002\/smll.75558","type":"journal-article","created":{"date-parts":[[2026,9,7]],"date-time":"2026-09-07T12:59:10Z","timestamp":1788785950000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["MPa\u2010Level Piezochromic Excimer Switching for Self\u2010Erasing Visual Encryption"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-2772-9491","authenticated-orcid":false,"given":"Hua","family":"Zhao","sequence":"first","affiliation":[{"name":"School of Chemistry and Chemical Engineering Nanchang University  Nanchang China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Junyu","family":"Xu","sequence":"additional","affiliation":[{"name":"School of Pharmacy Nanchang University  Nanchang 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