Synergistic Insights into Pyrazinophenazine based Hybrid Materials for Advancing Optoelectronics

We have synthesized a two novel hybrid molecules 3-(4-(9,9-dimethylacridin-10(9H)-yl)phenyl)-12,13-diphenyldibenzo[a,c]pyrazino[2,3-i]phenazine (Ac-DibzPyrQx) and 3-(4-(3,6-di-tert-butyl-9H-carbazol-9-yl)phenyl)-12,13 diphenyldibenzo[a,c]pyrazino [2,3-i]phenazine (tCz-DibzPyrQx), comprising electron-donating (9,9-dimethyl-9,10-dihydroacridine, 3,6-di-tert-butyl-9H-carbazole) and electron accepting Pyrazinophenazine groups. The two different electron-donating groups with pyrazinophenazine were synthesized with the view to tune the photophysical and electrochemical properties of the hybrids. The photophysical study displayed absorption maxima in the range of 320-340 nm and 400-500 nm whereas emission maxima at 602 and 540 nm in toluene for these emitters respectively. These compounds showed high thermal and morphological stability, as well as appropriate frontier molecular orbital (FMO) energy levels. These synthesized molecules show very high decomposition temperatures (3000C and 3800C) and exhibited good glass transition temperatures (3280C and 3000C), indicating their significant stability and potential utility as a bipolar host material for efficient phosphorescent organic light-emitting diodes (PhOLEDs) and TADF molecules.