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However, the conventional synthetic routes are cost\u2010expensive and time\u2010consuming. The development of a simple procedure to synthesize SpAs is still in urgent pursuing appreciated by academic and industrial communities. In this contribution, we present a feasible acid\u2010catalyzed solvent\u2010free metal\u2010free cyclization between diarylamines and ketones to construct SpAs. The as\u2010constructed moieties provide a wide possibility to assemble efficient TADF emitters. As an example, D2T\u2010TR with high photoluminescent quantum yield and proper TADF character is applied in organic light emitting diodes (OLEDs) which achieves a maximum external quantum efficiency (EQE) of 27.1\u2009%. This work shows us a bright inspiration on developing excellent organic optoelectronic materials and an effective tool to realize it.<\/jats:p>","DOI":"10.1002\/anie.202103187","type":"journal-article","created":{"date-parts":[[2021,3,26]],"date-time":"2021-03-26T08:39:57Z","timestamp":1616747997000},"page":"12376-12380","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":76,"title":["Versatile Direct Cyclization Constructs Spiro\u2010acridan Derivatives for Highly Efficient TADF emitters"],"prefix":"10.1002","volume":"60","author":[{"given":"He","family":"Liu","sequence":"first","affiliation":[{"name":"College of Materials Science and Engineering Shenzhen University Shenzhen 518055 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhiwen","family":"Liu","sequence":"additional","affiliation":[{"name":"College of Materials Science and Engineering Shenzhen University Shenzhen 518055 P. R. 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