Tuning emissive characteristics and singlet-triplet energy splitting of fluorescent emitters by encapsulation group modification: Yellow TADF emitter for solution-processed OLEDs with high luminance and ultraslow efficiency roll-off
Three fluorescent emitters were obtained by introducing various encapsulation groups into a blue TADF emissive core. These emitters exhibited tunable emissive color, different transient emissive behavior and good film-forming ability. A maximum EQE of 8.1% and a maximum luminance of 37300 cd m−2 with slow EQE roll-offs were achieved. This work would be instructive in the rational molecule design of solution-processed TADF materials.