Abstract
Two thermally activated delayed fluorescence (TADF) deep-blue emitters (4-SCZ, 4-SCZ-F) were developed by combining a novel spiro-type donor moiety with different triazine-based unit. By modifying the interplay between the donors and acceptor through tuning the phenylene linker using a fluorine substituent, singlet-triplet splitting (∆EST) can be regulated. In addition, the rigid geometry of these emitters also ensures their high photoluminance quantum yield (PLQY). As a result, when applied 4-SCZ-F as the emitter, good performance with current efficiency (CE)/power efficiency (PE)/external quantum efficiency (EQE) of 11.16 cd/A/9.74 lm/W/7.21% and Commission Internationale de l′Éclairage (CIE) coordinate at (0.16, 0.17) was achieved.
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