TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: No general preparation given. Preferred Compound: Compound (I) is preferably of formula (II). The light-emitting layer includes the organic electroluminescent element material as a host material, and contains a phosphorescent material. The phosphorescent material is an ortho metallated complex of iridium, osmium and/or platinum. At least 1 layer is a light-emitting layer containing host materials (I,II), and phosphorescent material which shows phosphorescence. Host material (II) is aryl-carbazolyl/carbazolyl-aryl-containing compound of formula: (Cz -) aA 3or Cz( -A 3) bor a fused ring compound of formula (III), polycyclic aromatic compound of formula: R' a-Ar 101-R' b, R' a-Ar 101-Ar 102-R' b, or R' a-Ar 101-Ar 102-Ar 103-R' b, a monoamine derivative of formula: N(-Ar 111)(Ar 112)-Ar 113, N(-Ar 114)(Ar 115)-Ar 116-Ar 117, or N(-Ar 118)(Ar 119)-(-Ar 120-) n-Ar 121, or fused ring compound chosen from compounds of formulae (IV)-(VIII).Cz=optionally substituted aryl carbazolyl or carbazolyl aryl;A 3=group of formula: (M 1) c-(L 5) d-(M 2) eor (M 3) c-(L 6) d-(M 4) e;a,b=1-3;M 1,M 2=2-40C nitrogen-containing heteroaryl or nitrogen-containing condensed heteroaryl which forms optionally substituted ring;L 5=single bond, or 6-30C aryl, 6-30C condensed aryl, 5-30C cycloalkylene, 2-30C heteroaryl, or 2-30C condensed heteroaryl (all optionally substituted);c,e=0-2;d=1-2;c+e=1 or more;M 3,M 4=6-40C aryl which form optionally substituted ring;L 6=single bond, or 6-30C aryl, 6-30C condensed aryl, or 5-30C cycloalkylene (all optionally substituted);R 101-R 106=H, halo, cyano, or 1-40C alkyl, 3-15C cycloalkyl, 3-20C heterocyclyl, 1-40C alkoxy, 6-40C aryl, 6-20C aryloxy, 7-20C aralkyl, 6-40C arylamino, 1-40C alkylamino, 7-60C aralkylamino, 7-40C arylcarbonyl, 6-20C arylthio, or 1-40C haloalkyl (all optionally substituted), with at least one being optionally substituted 9-carbazolyl, aza carbazolyl with 2-5 optionally substituted nitrogen atoms, or -L-9-carbazolyl;L=1-40C alkyl, 3-15C cycloalkyl, 3-20C heterocyclyl, 1-40C alkoxy, 6-40C aryl, 6-20C aryloxy, 7-20C aralkyl, 6-40C arylamino, 1-40C alkylamino, 7-60C aralkylamino, 7-40C arylcarbonyl, 6-20C arylthio, or 1-40C haloalkyl (all optionally substituted);X a=sulfur, oxygen or N-R 108;R 108=R 101-R 106;Ar 101,Ar 102,Ar 103,R' a,R' b=polycyclic aromatic skeleton portion with 6-60 ring-forming carbon atoms, chosen from benzene ring, naphthalene ring, chrysene ring, fluoranthene ring, phenanthrene ring, benzophenanthrene ring, dibenzophenanthrene ring, triphenylene ring, benzo(a)triphenylene ring, benzochrysene, benzo(b)fluoranthene ring, fluorene ring, and picene ring (all optionally substituted), with R' aand/or R' bpreferably being phenanthrene ring, benzo(c)phenanthrene ring, or fluoranthene ring (all optionally substituted);Ar 111-Ar 115,Ar 117-Ar 119,Ar 121=optionally substituted (hetero)aryl;Ar 116,Ar 120=optionally substituted (hetero)arylene;n=2-5;A 10-A 19=6-40C aryl, 2-40C heteroaryl, 8-40C aryl to which aromatic amino group is bonded, or 8-40C aryl to which heteroaryl is bonded (all optionally substituted);A 10+A 11,A 13+A 14,A 15+A 16,A 17+A 18=ring;X 4-X 9=single bond or 1-30C coupling group;Y 6-Y 24=H, halo, or 1-40C alkyl, 3-20C heterocyclyl, 6-40C aryl, 7-20C aralkyl 2-40C alkenyl, 1-40C alkylamino, 7-60C aralkylamino 3-20C alkylsilyl, 8-40C arylsilyl, 8-40C aralkylsilyl, or 1-40C haloalkyl (all optionally substituted);andXA-XE=sulfur, oxygen or nitrogen by which monoallyl substitution is carried out. Preferred Definitions:    A 1=optionally substituted pyrimidine ring or optionally substituted quinazoline ring.    SPECIFIC COMPOUNDS - 144 Compounds (I) are disclosed e.g. 9-(4-(2,6-diphenyl-pyrimidin-4-yl)-phenyl)-9'-phenyl-9H,9'H-(3,3')bicarbazolyl of formula (IA), 9-(3-(2,6-diphenyl-pyrimidin-4-yl)-phenyl)-9'-phenyl-9H,9'H-(3,3')bicarbazolyl, 9-(3-carbazol-9-yl-5-(2,6-diphenyl-pyrimidin-4-yl)-phenyl)-9'-phenyl-9H,9'H-(3,3')bicarbazolyl, 9-(4'-(2,6-diphenyl-pyrimidin-4-yl)-biphenyl-4-yl)-9'-phenyl-9H,9'H-(3,3')bicarbazolyl, and 9-(3'-(2,6-diphenyl-pyrimidin-4-yl)-biphenyl-4-yl)-9'-phenyl-9H,9'H-(3,3')bicarbazolyl.    EXAMPLE - (In g) N-phenylcarbazolyl-3-boronic acid (2), 3-iodo-9H-carbazole (2.05), tetrakis(triphenylphosphine)palladium (0.15), toluene (20 mL), 2M sodium carbonate aqueous solution (10.5 mL) were stirred at 80 degrees C for 7 hours. Water was added to the reaction solution, and the deposited solid was washed with methanol and hot toluene, to obtain 9-Phenyl-9H,9'H-(3,3')bicarbazolyl (2.43) with a yield of 84%. 5-(4-Bromophenyl)-1,3-diphenyl-1 lambda ~5~-pyridazine (2.28), the obtained compound (2.4), copper iodide (0.56), tripotassium phosphate (2.5), anhydrous dioxane (30 mL), cyclohexanediamine (0.33) were stirred at 100 degrees C for 8 hours. Water was added to the reaction liquid, and the deposited solid was washed with hexane and methanol. The solid was purified, to obtain 9-(4-(2,6-diphenyl-pyrimidin-4-yl)-phenyl)-9'-phenyl-9H,9'H-(3,3')bicarbazolyl (2.7) with a yield of 65%, having a molecular weight of 714. The obtained compound provided organic electroluminescent element having a current efficiency of 61 cd/A and a lifetime of 950 hours.