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Excited state deactivation can be limited by enhancing the radiative decay rate via thermally activated delayed fluorescence (TADF), bypassing spin\u2010forbidden phosphorescence. We report on linear copper(I) complexes bearing a recently reported [2.2]isoindolinophanyl\u2010carbene (iPC) ligand as potent excited state \u03c0\u2010acceptor. The compounds show efficient TADF from ligand\u2010to\u2010ligand charge transfer (\n                    <jats:sup>1\/3<\/jats:sup>\n                    LLCT) states with reverse intersystem\u2010crossing (RISC) of\n                    <jats:italic>k<\/jats:italic>\n                    <jats:sub>RISC<\/jats:sub>\n                    = 0.6\u201321\u00b710\n                    <jats:sup>9<\/jats:sup>\n                    s\n                    <jats:sup>\u22121<\/jats:sup>\n                    , quantum yields of up to 0.8 and\n                    <jats:italic>k<\/jats:italic>\n                    <jats:sub>TADF<\/jats:sub>\n                    of 0.8\u20101.9\u00b710\n                    <jats:sup>6<\/jats:sup>\n                    s\n                    <jats:sup>\u22121<\/jats:sup>\n                    that are among the fastest for Cu\n                    <jats:sup>I<\/jats:sup>\n                    emitters, outcompeting traditional triplet emitters based on Ir\n                    <jats:sup>III<\/jats:sup>\n                    and Pt\n                    <jats:sup>II<\/jats:sup>\n                    as well as organic deep red to near\u2010IR TADF emitters. While yellow to red emission is observed in single crystals, embedding the complexes into polymers or grinding shifts the luminescence into the deep red to near\u2010IR. The mechanochromism is due to disruption of C\u2500H\u22ef\u03c0 interactions between the ligands, reducing the energy gap between the ground state and\n                    <jats:sup>1\/3<\/jats:sup>\n                    LLCT states. The Cu\n                    <jats:sup>I<\/jats:sup>\n                    iPC complexes bear potential for devices operating under electroluminescent conditions as demonstrated by a proof\u2010of\u2010concept deep\u2010red OLED application.\n                  <\/jats:p>","DOI":"10.1002\/anie.5338298","type":"journal-article","created":{"date-parts":[[2026,4,25]],"date-time":"2026-04-25T11:11:07Z","timestamp":1777115467000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Highly Efficient Mechanochromic Thermally Activated Delayed Fluorescence in the Deep Red to Near\u2010Infrared in Copper(I) [2.2]Isoindolinophanyl\u2010Carbene Carbazolates"],"prefix":"10.1002","volume":"65","author":[{"given":"Andr\u00e9 M. 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