Donor engineering for diphenylsulfone derivatives with both thermally activated delayed fluorescence and aggregation-induced emission properties. (January 2021)

• Record Type: Journal Article
• Authors: Guo, Runda; Leng, Panpan; Zhang, Qing; Wang, Yaxiong; Lv, Xialei; Sun, Shuaiqiang; Ye, Shaofeng; Duan, Yalei; Wang, Lei
• Is Part Of: Dyes and pigments. Volume 184(2021)
• Publication Date: 2021-01
• Subjects: Organic light-emitting device -- Thermally activated delayed fluorescence -- Aggregation-induced emission -- Donor -- Nondoped; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2020.108781
• Languages: English
• ISSNs: 0143-7208

Abstract

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-9 H -carbazol-3-yl)sulfonyl)phenyl)-10 H -phenoxazine (3CP-DPS-PXZ ), and 9, 9-dimethyl-10-(4-((9-phenyl-9 H -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 ( k RISC ) 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/m 2 . 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. Graphical abstract: Image 1 Highlights: To develop asymmetrical D-A-D′ configuration AIE-TADF emitters based on DPS (A) 9-phenyl-9H-carbazole (D) by tuning D′. A maximum EQE of 17.9% was achieved by the nondoped OLED that using 3CP-DPS-PXZ as emitter. 3CP-DPS-PXZ based device obtained low efficiency roll-off with the EQE 14.5% @ 1000 cd/m 2 .