Abstract
Two 6,7-dicyanoquinoxaline/carbazole hybrid compounds (DCNQx-1 and DCNQx-2) were synthesized by introducing different carbazole groups into the quinoxaline-6,7-dicarbonitrile skeleton through the phenyl-bridged linkers, and characterized by NMR (1H and 13C) and high resolution mass spectrometry. The structure-property relationship of the compounds was revealed by exploring their thermal stability, photophysical and electrochemical properties. The compounds DCNQx-1 and DCNQx-2 showed bright orange red and green emission with the fluorescence quantum yield of 5.86% for DCNQx-1 and 64.87 % for DCNQx-2 in toluene solution, and exhibited red and yellow emission with the fluorescence quantum yield of 19.50% and 23.52% in solid states, respectively. Using tris(4-carbazoyl-9-ylphenyl)amine (TCTA) as the host material and 1,3-bis[3,5-di(pyridin-3-yl)phenyl]benzene (BmPyPB) as the electron transport material, the host-containing devices with a configuration of ITO/PEDOT:PSS (40 nm)/TCTA:DCNQx-derivative (x wt%) (30 nm)/BmPyPB (35 nm)/Liq (2 nm)/Al (200 nm) were fabricated by solution-processing the emitting layers to investigated their electroluminescence (EL) performances. In the absence of the hole-transporting layers, the host-containing devices of DCNQx-1 showed the maximum luminance (Lmax) was 3766 cd/m2, the maximum current efficiency (CEmax) was 15.55 cd/A, and the maximum external quantum efficiency (EQEmax) was 6.89%. The host-containing devices of DCNQx-2 exhibited the best EL performances with Lmax of 3786 cd/m2, CEmax of 28.45 cd/A and EQEmax of 8.85%.
Published Version
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