TECHNOLOGY FOCUS - ELECTRONICS - Preferred Components: The organic electric device comprises a first electrode (120), a second electrode (180) and an organic layer arranged between the first and second electrodes, where the organic layer made of (I). The organic layer comprises at least one of a hole injection layer (130), a hole transport layer (140), an auxiliary light-emitting layer and a light-emitting layer (150), where all the layers comprise (I). The organic electric device further comprises a light-efficiency-improvement layer arranged on at least one side of the first and second electrodes, and opposite to the organic layer. The organic layer is formed by using spin coating process, nozzle printing process, ink-jet printing process, slot coating process, dip coating process or roll-to-roll process.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Disclosed): The preparation (I) comprises reacting brominated nitrogen-containing heteroaromatic compounds of formula (II) with substituted 9H-carbazole compounds of formula (III) under tris(dibenzylideneacetone)dipalladium(0) and triphenylphosphine in sodium tert-butoxide and toluene. SPECIFIC COMPOUNDS - 544 Compounds (I) are specifically claimed, e.g. 12-(3-(9H-carbazol-9-yl)-5-(7-phenyl-7H-benzo(c)carbazol-10-yl)phenyl)-9-phenyl-9H-dibenzo(a,c)carbazole (Ia), 8-(3-(9H-carbazol-9-yl)-5-(9-phenyl-9H-carbazol-3-yl)phenyl)-11-phenyl-11H-benzo(a)carbazole, 8-(3-(9H-carbazol-9-yl)-5-(9-phenyl-9H-carbazol-3-yl)phenyl)-11-(naphthalen-1-yl)-11H-benzo(a)carbazole, 8-(3-(9H-carbazol-9-yl)-5-(9-phenyl-9H-carbazol-3-yl)phenyl)-11-(naphthalen-2-yl)-11H-benzo(a)carbazole and 8-(3-(9H-carbazol-9-yl)-5-(9-phenyl-9H-carbazol-3-yl)phenyl)-11-(biphenyl-4-yl)-11H-benzo(a)carbazole.    EXAMPLE - 15.8 g 12-(3-Bromo-5-(7-phenyl-7H-benzo(c)carbazol-10-yl)phenyl)-9-phenyl-9H-dibenzo(a,c)carbazole, 3.3 g 9H-carbazole, 0.9 g tris(dibenzylideneacetone)dipalladium(0), 0.5 g triphenylphosphine, 5.8 g sodium tert-butoxide and 210 ml toluene were added into a reactor and refluxed for 24 hours at 100 degrees C to obtain reaction mixture. The reaction mixture was extracted with ether and water, the organic layer was dried over magnesium sulfate, concentrated, purified by silica gel column chromatography, and recrystallized to obtain 12.8 g 12-(3-(9H-carbazol-9-yl)-5-(7-phenyl-7H-benzo(c)carbazol-10-yl)phenyl)-9-phenyl-9H-dibenzo(a,c)carbazole with 73% yield.