Abstract
Two new aggregation-induced thermally activated delayed fluorescence (AIE-TADF) luminogens based on diphenylsulfone derivatives with asymmetrical D-A-D′ configuration have been designed and synthesized, namely 10-(4-((9-phenyl-9H-carbazol-3-yl)sulfonyl)phenyl)-10H-phenoxazine (3CP-DPS-PXZ), and 9,9-dimethyl-10-(4-((9-phenyl-9H-carbazol-3-yl)sulfonyl)phenyl)-9,10-dihydroacridine (3CP-DPS-DMAC). The TADF and AIE properties of the new luminogens can be tuned by adjusting donor moiety (D′). Since phenoxazine featured stronger electron-donating capability compared with 9,9-dimethylacridine, 3CP-DPS-PXZ manifested a bathochromic-shift emission, enhanced AIE effect and higher reverse intersystem crossing (kRISC) rate constant in comparision with 3CP-DPS-DMAC. Systematic research on the thermal, electrochemical and photophysical properties for these two new compounds have been carried out. The fabricated nondoped green organic light-emitting device (OLED) utilizing 3CP-DPS-PXZ as emitter achieved a maximum external quantum efficiency (EQE) of 17.9 ± 0.3% and the EQE remained 14.5% at the luminance of 1000 cd/m2. However, the maximum EQE of 3CP-DPS-DMAC based blue nondoped OLED was only 9.1 ± 0.2%. These manifested asymmetrical D-A-D’ structure molecular is an efficient way to optimize the performance of AIE-TADF emitter.
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