TECHNOLOGY FOCUS - ELECTRONICS - Preferred Components: The organic layer includes at least one hole transport layer (140), auxiliary light-emitting layer (151) and light-emitting layer (150), where all the layers are made of (I). The organic electric device further comprises a light-efficiency-improvement layer arranged on one side of the first and second electrodes and opposite to the organic layer.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Disclosed): The preparation of (I) comprises reacting brominated arylene compounds of formula (X-(L2-Br)n) (IV) with substituted fluorene-carbazole-containing amine compounds of formula (V) under tris(dibenzylideneacetone)dipalladium(0) and triphenylphosphine in sodium tert-butoxide and toluene. Preferred Components: (I) are mixture of single crosslinking former-containing compounds and at least two crosslinking formers-containing compounds in molar ratio of 99:1-1:99. Preferred Method: The organic layer is formed by spin coating process, nozzle printing process, ink-jet printing process, slot coating process, dip coating process or roll-to-roll process. SPECIFIC COMPOUNDS - 26 Compounds (I) are specifically claimed, e.g. N4,N4'-bis(9,9-dimethyl-9H-fluoren-2-yl)-N4,N4'-bis(9-phenyl-6-(1,2,2-trifluorovinyloxy)-9H-carbazol-3-yl)biphenyl-4,4'-diamine (Ia), N1-(9,9-dimethyl-7-(4-((4-vinylphenoxy)methyl)phenyl)-9H-fluoren-2-yl)-N4,N4-bis(4-((9,9-dimethyl-7-(4-((4-vinylphenoxy)methyl)phenyl)-9H-fluoren-2-yl)(4-(9-phenyl-9H-carbazol-3-yl)phenyl)amino)phenyl)-N1-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)benzene-1,4-diamine, N1-(9,9-dimethyl-7-(4-((4-vinylphenoxy)methyl)phenyl)-9H-fluoren-2-yl)-N4,N4-bis(4-((9,9-dimethyl-7-(4-((4-vinylphenoxy)methyl)phenyl)-9H-fluoren-2-yl)(4-(9-phenyl-6-(4-vinylphenyl)-9H-carbazol-3-yl)phenyl)amino)phenyl)-N1-(4-(9-phenyl-6-(4-vinylphenyl)-9H-carbazol-3-yl)phenyl)benzene-1,4-diamine, N1-(9,9-dimethyl-7-(4-(1,2,2-trifluorovinyloxy)phenyl)-9H-fluoren-2-yl)-N4,N4-bis(4-((9,9-dimethyl-7-(4-(1,2,2-trifluorovinyloxy)phenyl)-9H-fluoren-2-yl)(4-(9-ethyl-9H-carbazol-3-yl)phenyl)amino)phenyl)-N1-(4-(9-ethyl-9H-carbazol-3-yl)phenyl)benzene-1,4-diamine and N1-(9,9-diphenyl-9H-fluoren-2-yl)-N4,N4-bis(4-((9,9-diphenyl-9H-fluoren-2-yl)(4-(9-phenyl-6-(4-(1,2,2-trifluorovinyloxy)phenyl)-9H-carbazol-3-yl)phenyl)amino)phenyl)-N1-(4-(9-phenyl-6-(4-(1,2,2-trifluorovinyloxy)phenyl)-9H-carbazol-3-yl)phenyl)benzene-1,4-diamine.    EXAMPLE - 6.2 g 4,4'-Dibromobiphenyl, 21.9 g N-(9,9-dimethyl-9H-fluoren-2-yl)-9-phenyl-6-(1,2,2-trifluorovinyloxy)-9H-carbazol-3-amine, 1.8 g tris(dibenzylideneacetone)dipalladium(0), 1 g triphenylphosphine, 11 g sodium tert-butoxide and 420 ml toluene were added into a reactor and refluxed at 100 degrees C for 24 hours to obtain reaction mixture. The reaction mixture was extracted with ether and water, dried over magnesium sulfate, concentrated, separated by silica gel column chromatography and recrystallized to obtain 16.9 g N4,N4'-bis(9,9-dimethyl-9H-fluoren-2-yl)-N4,N4'-bis(9-phenyl-6-(1,2,2-trifluorovinyloxy)-9H-carbazol-3-yl)biphenyl-4,4'-diamine with 68% yield.