Abstract
Novel bipolar material 2-(5-phenylindolo[3,2-a]carbazol-12(5H)-yl)dibenzothiophene 5,5-dioxide (DBTO-IN/CAR) was designed and synthesized with a high yield of 64%. The synthesized material exhibited an excellent glass transition temperature of 156 °C, which manifests as a high thermal stability of DBTO-IN/CAR. We fabricated two different devices, namely a green phosphorescent OLED and a non-doped bipolar fluorescent emitter, with DBTO-IN/CAR as the bipolar material. The DBTO-IN/CAR host material based device exhibited excellent maximum power and current efficiencies of 45.36 lm/W and 51.98 cd/A, respectively. The efficiencies are higher than that of the reference CBP-based similar device, which exhibited a power efficiency of 42.01 lm/W. The DBTO-IN/CAR-based green phosphorescent device revealed a good external quantum efficiency of 19.03%. Moreover, the non-doped DBTO-IN/CAR fluorescent emitter related device also exhibited better current and external quantum efficiencies of 4.30 cd/A and 2.47%, respectively, with the emission of cyan color.
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