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A standing challenge for their development is pushing absorptions into the low\u2010energy end of the electromagnetic spectrum, which is highly desirable to avoid photodamage, allows mixing of photoresponsive components, and maximizes the available color range. Here we report on a novel photoswitch motif,\n                    <jats:italic>peri<\/jats:italic>\n                    \u2010benzo[\n                    <jats:italic>a<\/jats:italic>\n                    ]fluoranthenethioindigo (PBFT), enabling direct excitation with near\u2010infrared (NIR) light up to 900\u00a0nm wavelengths in a fully reversible fashion. PBFT provides an outstanding property profile with high isomer yields, good thermal bistability, and strongly distinct color changes from pale green to deep blue. Application within a commercially available and easy\u2010to\u2010use polymer material allows to realize reversible and spatially resolved inscription of information with extremely long wavelengths of light. Writing information into versatile handheld 2D and 3D optical displays and optical memories is thus possible with non\u2010damaging irradiation, invisible to the naked eye.\n                  <\/jats:p>","DOI":"10.1002\/anie.5802775","type":"journal-article","created":{"date-parts":[[2026,6,11]],"date-time":"2026-06-11T06:19:00Z","timestamp":1781158740000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["A Reversible 900 nm Near\u2010Infrared Photoswitch for Invisibly Writable 2D and 3D Displays"],"prefix":"10.1002","volume":"65","author":[{"given":"Elias","family":"Ciekalski","sequence":"first","affiliation":[{"name":"Department of Chemistry and Pharmacy Friedrich\u2010Alexander\u2010Universit\u00e4t Erlangen\u2010N\u00fcrnberg  Erlangen 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