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In contrast, excitations in the spin doublet manifold in organic radical semiconductors can show efficient luminescence. Here the dynamics of the spin allowed process of intermolecular energy transfer from triplet to doublet excitons are explored. A carbene\u2010metal\u2010amide (CMA\u2010CF<jats:sub>3<\/jats:sub>) is employed as a model triplet donor host, since following photoexcitation it undergoes extremely fast intersystem crossing to generate a population of triplet excitons within 4\u00a0ps. This enables a foundational study for tracking energy transfer from triplets to a model radical semiconductor, TTM\u20103PCz. Over 74% of all radical luminescence originates from the triplet channel in this system under photoexcitation. It is found that intermolecular triplet\u2010to\u2010doublet energy transfer can occur directly and rapidly, with 12% of triplet excitons transferring already on sub\u2010ns timescales. This enhanced triplet harvesting mechanism is utilized in efficient near\u2010infrared organic light\u2010emitting diodes, which can be extended to other opto\u2010electronic and \u2010spintronic technologies by radical\u2010based spin control in molecular semiconductors.<\/jats:p>","DOI":"10.1002\/adma.202402790","type":"journal-article","created":{"date-parts":[[2024,5,31]],"date-time":"2024-05-31T11:08:07Z","timestamp":1717153687000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":20,"title":["Fast Transfer of Triplet to Doublet Excitons from Organometallic Host to Organic Radical Semiconductors"],"prefix":"10.1002","volume":"36","author":[{"given":"Qinying","family":"Gu","sequence":"first","affiliation":[{"name":"Cavendish Laboratory University of Cambridge  Cambridge CB3 0HE UK"},{"name":"Shanghai Artificial Intelligence Laboratory  Shanghai 200232 P. R. 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