biostudies-literatureUnknown14(1)Meng GThe pursuit of ideal short-delayed thermally activated delayed fluorescence (TADF) emitters is hampered by the mutual exclusion of a small singlet-triplet energy gap (ΔE_ST) and a large oscillator strength (f). Here, by attaching an multiresonance-acceptor onto a sterically-uncrowded donor, we report TADF emitters bearing hybrid electronic excitations with a main donor-to-acceptor long-range (LR) and an auxiliary bridge-phenyl short-range (SR) charge-transfer characters, balancing a small ΔE_ST and a large f. Moreover, the incorporation of dual equivalent multiresonance-acceptors is found to double the f value without affecting the ΔE_ST. A large radiative decay rate over an order of magnitude higher than the intersystem crossing (ISC) rate, and a decent reverNature communications2394https://www.ebi.ac.uk/biostudies/studies/S-EPMC10133342biostudies-literatureHigh-efficiency and stable short-delayed fluorescence emitters with hybrid long- and short-range charge-transfer excitations.PMC10133342Duan LZhang DWang QZhang YZeng XWang XYang DMa DMeng GDai HZhou JFan TfalseHigh-efficiency and stable short-delayed fluorescence emitters with hybrid long- and short-range charge-transfer excitations.The pursuit of ideal short-delayed thermally activated delayed fluorescence (TADF) emitters is hampered by the mutual exclusion of a small singlet-triplet energy gap (ΔE_ST) and a large oscillator strength (f). Here, by attaching an multiresonance-acceptor onto a sterically-uncrowded donor, we report TADF emitters bearing hybrid electronic excitations with a main donor-to-acceptor long-range (LR) and an auxiliary bridge-phenyl short-range (SR) charge-transfer characters, balancing a small ΔE_ST and a large f. Moreover, the incorporation of dual equivalent multiresonance-acceptors is found to double the f value without affecting the ΔE_ST. A large radiative decay rate over an order of magnitude higher than the intersystem crossing (ISC) rate, and a decent rever2023-01-01T00:00:00Z2023 Apr2025-04-04T11:05:15.774Z2025-04-04T11:05:15.774ZS-EPMC101333423710078510.1038/s41467-023-38086-4