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Here, we investigate S1\/S0 nonradiative decay in four prototypical charge-transfer (CT) TADF emitters, PXZ-TRZ, DMAC-TRZ, PXZ-DPS, and DMAC-DPS, using time-resolved spectroscopy, theoretical calculations, and vibrational analysis. Despite comparable CT character, emitters exhibit fluorescence quantum yields differing by up to two-orders-of-magnitude, originating from largely differed kNRS. By applying the Englman\u2013Jortner energy-gap law and the Jortner\u2013Bixon model, we quantitatively reveal the vibrational effect on kNRS: (1) kNRS of D\u2013A and D-A-D emitters is dominated by high- (\u223c900 cm\u20131) and low-frequency (\u223c60 cm\u20131) modes, respectively; (2) low-frequency modes promote kNRS far less effectively than high-frequency modes, even though they couple to S1 \u2192 S0 transition equally; and (3) the more rigid DMAC donor reduces the reorganization energy, thereby suppressing the vibrational promotion of kNRS. These results establish a general framework for analyzing vibrational effects in CT-TADF emitters lacking a dominant promoting mode and suggest rational molecular design strategies for high-performance emitters.<\/jats:p>","DOI":"10.1021\/acs.jpcb.6c03904","type":"journal-article","created":{"date-parts":[[2026,8,17]],"date-time":"2026-08-17T19:02:27Z","timestamp":1786993347000},"page":"8698-8709","source":"Crossref","is-referenced-by-count":0,"title":["Elucidating Nonradiative Relaxation of Charge-Transfer-Type\nThermally Activated Delayed Fluorescence Emitters: The Vibrational\nEffect"],"prefix":"10.1021","volume":"130","author":[{"given":"Yiran","family":"Tian","sequence":"first","affiliation":[{"name":"Tianjin University , , ,","place":["Tianjin, P. R. China, 300072"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qinghua","family":"Zhou","sequence":"additional","affiliation":[{"name":"Tianjin University , , ,","place":["Tianjin, P. R. 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