TECHNOLOGY FOCUS - ELECTRONICS - Preferred Layers: The organic layer consists of hole-injection layer and/or hole-transport layer containing the carbazole derivative, and a light-emitting layer (3) containing the carbazole derivative.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: No general preparation given. SPECIFIC COMPOUNDS - 80 Carbazole derivatives are specifically claimed e.g. (4-(9,9-dimethyl-9H-fluoren-2-yl)-phenyl)-(6-methyl-9-phenyl-9H-carbazol-3-yl)-phenyl-amine of formula (Ia), (4-(9,9-dimethyl-9H-fluoren-2-yl)-phenyl)-(6-methyl-9-phenyl-9H-carbazol-3-yl)-p-tolyl-amine, biphenyl-4-yl-(4-(9,9-dimethyl-9H-fluoren-2-yl)-phenyl)-(6-methyl-9-phenyl-9H-carbazol-3-yl)-amine, (9-biphenyl-4-yl-6-methyl-9H-carbazol-3-yl)-(4-(9,9-dimethyl-9H-fluoren-2-yl)-phenyl)-phenyl-amine, and (4-(9,9-dimethyl-9H-fluoren-2-yl)-phenyl)-(6-methyl-9-phenyl-9H-carbazol-3-yl)-naphthalen-1-yl-amine.    EXAMPLE - (In g) 2-bromo-9,9-dimethylfluorene (30) and 4-chlorobenzene boronic acid (20.6) were dissolved in tetrahydrofuran (200 ml). Potassium-carbonate aqueous solution (150 ml) and tetrakis(triphenylphosphine)palladium (1.3) were added and heat-stirred for 5 hours. The temperature was reduced to room temperature, and the organic layer was extracted and concentrated to obtain 2-(4-chlorophenyl)-9,9-dimethyl-9H-fluorene (29.4) with a yield of 88%. The obtained compound (10) and aniline (2.8 ml) were dissolved in toluene (100 ml). Sodium-t-butoxide (3.5) and bis(tri-t-butylphosphine)palladium (84 mg) were added and heat-stirred for 1 hour under nitrogen. Water (100 ml) was added to the reaction solution and extraction was carried out. The organic layer was purified to obtain (4-(9,9-dimethyl-9H-fluoren-2-yl)-phenyl)-phenyl-amine (8.2) with a yield of 69%. 3-Bromo-6-methyl-9-phenyl-9H-carbazole (11.2) and the obtained compound (11.4) were dissolved in xylene (150 ml). Sodium-t-butoxide (3.6) and bis(tri-t-butylphosphine)palladium (81 mg) were added and heat-stirred for 1 hour under nitrogen. Distilled water (100 ml) was added and extraction was carried out. The organic layer was concentrated to obtain (4-(9,9-dimethyl-9H-fluoren-2-yl)-phenyl)-(6-methyl-9-phenyl-9H-carbazol-3-yl)-phenyl-amine (14.9) of formula (Ia) with a yield of 76%.