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However, coexistence of high efficacy, sensitivity, along with stability is rare. Herein, a class of 0D perovskite material (BAPP)In\n                    <jats:sub>2\u20102x<\/jats:sub>\n                    Sb\n                    <jats:sub>2x<\/jats:sub>\n                    Br\n                    <jats:sub>10<\/jats:sub>\n                    (where BAPP is (1,4\u2010bis(3\u2010aminopropyl) piperazine) is presented simultaneously featuring strong fluorescence and advanced optical characteristics. In addition to its inquisitive property, a reversible solid\u2010state photoluminescence transition triggering is portrayed on the addition of a small foreign molecule like methanol. The reversible transition is accompanied by quenching the overall emission of the doped material with considerable modification in the mother structure. These switchable on\u2010off transitions are accompanied by the attachment of a methanol group to the octahedral centers. Furthermore, these switchable emission states are utilized for an efficient information encryption strategy through an 8*8\u2010bit ASCII code in the form of a modular matrix. Hence, such mechanistic investigations with respect to photoluminescence (PL) modulations provide new avenues for unclonable information storage and encryption for diverse fields.\n                  <\/jats:p>","DOI":"10.1002\/smll.202506790","type":"journal-article","created":{"date-parts":[[2025,9,12]],"date-time":"2025-09-12T09:21:17Z","timestamp":1757668877000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Reversible Switching of 0D Halide Perovskite with Small Molecule Absorbate for Information Encryption"],"prefix":"10.1002","volume":"21","author":[{"given":"Monika","family":"Salesh","sequence":"first","affiliation":[{"name":"Department of Metallurgical Engineering and Material Science Indian Institute of Technology Bombay  Powai Mumbai 400076 India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sumit Kumar","family":"Sharma","sequence":"additional","affiliation":[{"name":"Centre for Research in Nanotechnology and Science Indian Institute of Technology Bombay  Powai Mumbai 400076 India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dipanti","family":"Borah","sequence":"additional","affiliation":[{"name":"Department of Chemistry Indian Institute of Technology Bombay  Powai Mumbai 400076 India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maheswaran","family":"Shanmugam","sequence":"additional","affiliation":[{"name":"Department of Chemistry Indian Institute of Technology Bombay  Powai Mumbai 400076 India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2573-7474","authenticated-orcid":false,"given":"Aswani","family":"Yella","sequence":"additional","affiliation":[{"name":"Department of Metallurgical Engineering and Material Science Indian Institute of Technology Bombay  Powai Mumbai 400076 India"},{"name":"Centre for Research in Nanotechnology and Science Indian Institute of Technology Bombay  Powai Mumbai 400076 India"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,9,12]]},"reference":[{"key":"e_1_2_5_1_1","doi-asserted-by":"publisher","DOI":"10.1007\/s11277-022-09838-0"},{"key":"e_1_2_5_2_1","doi-asserted-by":"publisher","DOI":"10.32604\/iasc.2022.021786"},{"key":"e_1_2_5_3_1","doi-asserted-by":"publisher","DOI":"10.1109\/MCOM.1978.1089771"},{"key":"e_1_2_5_4_1","first-page":"10","volume":"11","author":"Oladoyinbo T. 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