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This approach is underexplored for thermally activated delayed fluorescence (TADF) materials. In this study, we report that the addition of a Lewis acid can induce large (&gt;100\u00a0nm) bathochromic shifts in the emission in sulfone\u2010based donor\u2013acceptor TADF (DA\u2010TADF) emitters and for the first time in multi\u2010resonant TADF (MR\u2010TADF) emitters, whilst retaining TADF behaviour. This is achieved through the binding of a 9\u2010sulfonium\u201010\u2010bora\u2010triptycene (BTripS) Lewis acid to the fluorophore carbonyl or sulfone moiety to form bench\u2010stable Lewis adducts. In contrast, when using B(C\n                    <jats:sub>6<\/jats:sub>\n                    F\n                    <jats:sub>5<\/jats:sub>\n                    )\n                    <jats:sub>3<\/jats:sub>\n                    as the Lewis acid, the generated adducts rapidly decompose on exposure to water to form H\n                    <jats:sub>2<\/jats:sub>\n                    O\u2010B(C\n                    <jats:sub>6<\/jats:sub>\n                    F\n                    <jats:sub>5<\/jats:sub>\n                    )\n                    <jats:sub>3<\/jats:sub>\n                    . This work demonstrates that the formation of bench\u2010stable Lewis adducts has significant potential as a method to redshift the emission of two popular classes of TADF compounds. This provides a new approach to address the current challenge of accessing longer\u2010wavelength\u2010emitting MR\u2010TADF materials.\n                  <\/jats:p>","DOI":"10.1002\/anie.3353986","type":"journal-article","created":{"date-parts":[[2026,9,26]],"date-time":"2026-09-26T12:06:32Z","timestamp":1790424392000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Redshifting TADF Emission With a Bora\u2010Triptycene Lewis Acid"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3495-442X","authenticated-orcid":false,"given":"Mathew J.","family":"Cross","sequence":"first","affiliation":[{"name":"EaStCHEM School of Chemistry University of Edinburgh  Edinburgh UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9154-4227","authenticated-orcid":false,"given":"Emily L.","family":"Hanover","sequence":"additional","affiliation":[{"name":"EaStCHEM School of Chemistry University of Edinburgh  Edinburgh UK"},{"name":"Organic Semiconductor Centre EaStCHEM School of Chemistry University of St Andrews  St. Andrews UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Arnaud","family":"Osi","sequence":"additional","affiliation":[{"name":"EaStCHEM School of Chemistry University of Edinburgh  Edinburgh UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7183-6022","authenticated-orcid":false,"given":"Eli","family":"Zysman\u2010Colman","sequence":"additional","affiliation":[{"name":"Organic Semiconductor Centre EaStCHEM School of Chemistry University of St Andrews  St. Andrews UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9975-8302","authenticated-orcid":false,"given":"Michael J.","family":"Ingleson","sequence":"additional","affiliation":[{"name":"EaStCHEM School of Chemistry University of Edinburgh  Edinburgh UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,9,26]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.chemrev.3c00755"},{"key":"e_1_2_8_3_1","doi-asserted-by":"crossref","DOI":"10.1016\/j.dyepig.2025.113147","article-title":"Advancing Solution\u2010Processed Narrow\u2010Bandwidth Thermally Activated Delayed Fluorescence OLEDs: Progress and Potential","volume":"224","author":"Vijayalakshmi L.","year":"2026","journal-title":"Dyes and Pigments"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1002\/adom.202402653"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1021\/accountsmr.3c00124"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1038\/s44222-025-00343-0"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1038\/nphoton.2014.12"},{"key":"e_1_2_8_8_1","doi-asserted-by":"crossref","DOI":"10.1002\/adom.201901627","article-title":"Improving Processability and Efficiency of Resonant TADF Emitters: A Design Strategy","volume":"8","author":"Hall D.","year":"2019","journal-title":"Advanced Optical Materials"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1002\/adom.201801536"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1039\/D4SC02513J"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.jpclett.4c01472"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.aeb5832"},{"key":"e_1_2_8_13_1","doi-asserted-by":"crossref","first-page":"620","DOI":"10.1021\/acs.chemmater.9b04585","article-title":"Coordination\u2010Induced Thermally Activated Delayed Fluorescence: From Non\u2010TADF Donor\u2013Acceptor\u2010Type Ligand to TADF\u2010Active Ag\u2010Based Complexes","volume":"32","author":"Jia J. 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