Abstract
Carbazole-based diaza[7]helicene substituted by thiophene groups, 2,12-dithiophene-5,15-dihexyl-5,15-diaza[7]helicene (6), was synthesised successfully and confirmed by 1H NMR, 13C NMR, High Resolution Mass Spectrometry, Time of Flight Mass Spectrometry. Compound 6 exhibited good solubility and excellent thermal stability with no melting point and a high decomposition temperature of 453.64°C. A doped device with a structure of ITO/NPB (50nm)/CBP: 10% 6 (30nm)/Bphen (20nm)/Mg:Ag (150nm)/Ag (50nm) emitted the blue light at 460nm with Commission Internationale de LEclairage (CIE) coordinate of (0.176, 0.26). The maximum brightness and external quantum efficiency (EQE) were 2306cdm−2 and 0.41%, respectively.
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