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However, the conformational and electronic variations induced by the heavy and large atoms may also have adverse effects on the TADF properties. Herein, the design, synthesis, and structures of a new type of through\u2010space charge transfer (TSCT) emitters containing benzothiazino[2,3,4\u2010kl]phenothiazine (DPTZ) as the donor unit are reported. The influences of S atoms on the emission properties have been systematically investigated by means of theoretical simulations, electrochemical and spectroscopic studies. Although the presence of \u03c0\u2010stacking interactions and calculated spin\u2010orbit coupling (SOC) values are beneficial for TSCT\u2010TADF properties, the triplet TSCT states are uplifted to above the locally excited (LE) state of the acceptor moieties. As a result, the new emitters display longer delayed fluorescence lifetimes (\u03c4<jats:sub>DF<\/jats:sub>) of 255.0\u2013114.3\u2005\u03bcs and lower PLQYs of 45\u201361\u2009% in comparison with the O\u2010containing congeners (\u03c4<jats:sub>DF<\/jats:sub>=26.9\u20136.8\u2005\u03bcs; PLQYs=74\u201371\u2009%). This work highlights that a full consideration of various effects is essential when making use of heavy chalcogen atoms for the design of TADF emitters.<\/jats:p>","DOI":"10.1002\/chem.202202305","type":"journal-article","created":{"date-parts":[[2022,9,1]],"date-time":"2022-09-01T12:15:14Z","timestamp":1662034514000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":20,"title":["Influence of Sulfur Atoms on TADF Properties from Through\u2010Space Charge Transfer Excited States"],"prefix":"10.1002","volume":"28","author":[{"given":"Danwen","family":"Zhang","sequence":"first","affiliation":[{"name":"Shenzhen Key Laboratory of New Information Display and Storage Materials College of Materials Science and Engineering Shenzhen University  Shenzhen 518055 P. R. 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