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However, the harsh synthetic routes for polychlorinated compounds and the possible luminescence quenching from the compact intermolecular \u03c0\u2013\u03c0 stacking induced by chlorine atoms limit their investigations and applications in luminescent materials. Herein, two isomeric polychlorinated polycyclic aromatic hydrocarbon (PAH) compounds <jats:bold>JY\u20101\u2010Cl<\/jats:bold> and <jats:bold>JY\u20102\u2010Cl<\/jats:bold> consisting of rigidified aryl ketones and amine are designed and synthesized under mild conditions through nucleophilic chlorination intermediated by an electron donor\u2010acceptor complex. Among them, as a result of the strong \u03c0\u2013\u03c0 interactions induced by chlorine atoms, <jats:bold>JY\u20102\u2010Cl<\/jats:bold> exhibits bright monomer and dimer emissions with dual thermally activated delayed fluorescence (TADF) characters. Notably, compared with the non\u2010chlorinated compounds, a high photoluminescence quantum yield is maintained after introducing multiple chlorine atoms into <jats:bold>JY\u20102\u2010Cl<\/jats:bold>. The first dual\u2010TADF organic light\u2010emitting diodes are also successfully fabricated with maximum external quantum efficiency as high as 29.1\u2009% by employing <jats:bold>JY\u20102\u2010Cl<\/jats:bold> as emitter. This work presents a new paradigm and synthesis of polychlorinated amine\u2010carbonyl PAHs and demonstrates the great potential of the chlorinated materials for luminescent applications.<\/jats:p>","DOI":"10.1002\/anie.202309104","type":"journal-article","created":{"date-parts":[[2023,7,28]],"date-time":"2023-07-28T02:48:17Z","timestamp":1690512497000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":23,"title":["Mild Synthesis of Polychlorinated Arenes for Efficient Organic Light\u2010emitting Diodes with Dual Thermally Activated Delayed Fluorescence"],"prefix":"10.1002","volume":"62","author":[{"given":"Yihang","family":"Jiao","sequence":"first","affiliation":[{"name":"State Key Laboratory of Luminescent Materials and Devices and Institute of Polymer Optoelectronic Materials and Devices South China University of Technology  Wushan Road 381, Tianhe District Guangzhou 510640 Guang-dong Province P. R. 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