TECHNOLOGY FOCUS - ELECTRONICS - Preferred Layers: The light-emitting layer contains compound (I) as host material, and further contains a phosphorescent material chosen from iridium, osmium and platinum. The organic thin film layer has an electron-injection layer (7) provided between the cathode and light-emitting layer. The electron-injection layer contains a nitrogen-containing ring derivative. The organic thin film layer has an electron-carrying layer provided between the cathode and light-emitting layer. The electron-carrying layer contains compound (I). A reducing dopant is added to the interface region of cathode and organic thin film layer.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: No general preparation given. Preferred Definitions:    Nr1=pyrimidine ring;    k=1;    m+n+p+q=6 or less;    Y1,Y2=H or phenyl;    L1-L3,L5,L6=single bond, or phenylene, biphenylene, terphenylene or fluorenylene (all optionally substituted);    L4,L7=single bond, or phenylene, biphenylene or terphenylene (all optionally substituted);    m+n,p+q=1 or 2;    Ar=benzene ring;and    Cz1,Cz2=group of formula (i or ii).    SPECIFIC COMPOUNDS - 233 Compounds (I) are disclosed e.g. 9-(3-(9,9-dimethyl-9H-fluoren-2-yl)-5-(4,6-diphenyl-pyrimidin-2-yl)-phenyl)-9H-carbazole of formula (IA), 9-(4-(4-(9,9-dimethyl-9H-fluoren-2-yl)-6-phenyl-pyrimidin-2-yl)-phenyl, 9-(4-(4-(9,9-dimethyl-9H-fluoren-2-yl)-6-phenyl-(1,3,5)triazin-2-yl)-phenyl)-9H-carbazole, 9-(4-(2-(9,9-dimethyl-9H-fluoren-2-yl)-6-phenyl-pyridin-4-yl)-phenyl)-9H-carbazole, and 9-(3-(4-(9,9-dimethyl-9H-fluoren-2-yl)-6-phenyl-(1,3,5)triazin-2-yl)-phenyl)-9H-carbazole)-9H-carbazole.    EXAMPLE - (In g) (3-(9H-carbazol-9-yl)-5-(9,9-dimethyl-9H-fluoren-2-yl)phenyl)boranediol (4.8), 2-chloro-4,6-diphenylpyrimidine (2.66), 2M sodium carbonate aqueous solution (12 ml), toluene (20 ml), dimethyl ether (20 ml), and tetrakis(triphenylphosphine) palladium (0.35) were stirred at reflux temperature under argon atmosphere for 16 hours. The reaction solution was cooled to room temperature. Toluene (200 ml) and water (100 ml) were added, and the organic phase was fractionated. The residue obtained by concentrating the organic phase was purified using hexane/toluene, to obtain 9-(3-(9,9-dimethyl-9H-fluoren-2-yl)-5-(4,6-diphenyl-pyrimidin-2-yl)-phenyl)-9H-carbazole (3) with a yield of 45%. The compound had a molecular weight of 665. The compound provided organic electroluminescent elements having high luminous efficiency and low drive voltage.