TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preparation (Claimed): The preparation of (I), (II), (IIIa), or (IIIb), comprises introducing the groups Ar3 and/or Ar2 by a metal-catalyzed coupling reaction, preferably Suzuki coupling or Hartwig-Buchwald coupling reaction. Preferred Components: The fluorene derivative (Q) is (there are 39 structures given) e.g.: fluorine derivative of formulae (V)-(XIV). The phosphorescent emitter is an iridium complex of formulae (XXX) or (XXXI) or a platinum complex of formulae (XXXII) or (XXXIII).DCy = cyclic group comprising donor atom, preferably N, C in the form of carbene or P, over which the cyclic group is bonded to the metal, and which again carries R1, where the groups DCy CCy are bonded together via covalent bond;CCy = cyclic group comprising C, over which the cyclic group is bonded to the metal, which again carries R1; andA = monoanionic, bidentate chelating ligand, preferably diketonate ligand. Preferred Definitions:    Ar3 = monovalent group (13 structures are given) e.g. triazine of formulae (XV)-(XVII), pyridine of formula (XVIII) or pyridazine of formula (XIX), bivalent group (8 structures are given) e.g. triazine of formulae (XX), (XXI), pyridazine of formulae (XXII), (XXIII), or pyridine of formula (XXIV);    c = bonding to fluorene, spirobifluorene or optionally to Ar1;    Ar2 = carbazole group (14 structures are given) e.g. carbazole of formulae (XXV)-(XXIX); and    d = bonding of Ar2 to the molecule.    SPECIFIC COMPOUNDS - 81 Compounds (I) are disclosed, e.g. 9-(2'-(4,6-diphenyl-1,3,5-triazin-2-yl)-9,9'-spirobi(fluorene)-2-yl)-9H-carbazole (Ia), 9-(4-(2'-(4,6-diphenyl-1,3,5-triazin-2-yl)-9,9'-spirobi(fluorene)-2-yl)phenyl)-2-phenyl-9H-carbazole, 9-(4-(2'-(4,6-diphenyl-1,3,5-triazin-2-yl)-9,9'-spirobi(fluorene)-2-yl)phenyl)-9H-carbazole, 9-(2'-(4-(2-fluorophenyl)-6-(3-fluorophenyl)-1,3,5-triazin-2-yl)-9,9'-spirobi(fluorene)-2-yl)-9H-carbazole, 9-(2'-(4-(perfluorophenyl)-6-(2,3,6-trifluoro-4,5-dimethylphenyl)-1,3,5-triazin-2-yl)-9,9'-spirobi(fluorene)-2-yl)-9H-carbazole.    EXAMPLE - Degassed solution of carbazole (23.3 g) and 2,2'-diiodo-9,9'-spirobifluorene (204 g) in xylene (250 ml) was saturated for 1 hour with nitrogen. Then the solution was added with tri-tert-butylphosphine (3 ml), palladium acetate (0.5 g) and potassium phosphate (81.9 g). The reaction mixture was heated for 18 hours under reflux. Then water (1000 ml) was added after cooling to room temperature. The reaction mixture was worked up to obtain 2-iodo-7'-9H carbazole-9,9'-spirobifluorene. Then (2-iodo-7'-9H-carbazole-9,9'-spirobifluorene (118 g) was dissolved in dry diethyl ether (1500 ml) at -70 degrees C and 2 M solution of n-butyl lithium (420 ml) in cyclohexane was added dropwise, and after 1 hour trimethyl borate (130 ml) was added dropwise, heated within 1 hour at room temperature. The solvent was removed, and pinacol (90 g) and toluene (1000 ml) were added, boiled for 2 hours and the solvent was again removed to obtain 2-iodo-7'-9H-carbazole-9,9'-spirobifluorene-2-boronic acid glycol ester. Then (2-iodo-7'-9H-carbazole-9,9'-spirobifluorene-2-boronic acid glycol ester (68 g), 2-chloro-4 ,6-diphenyl-1,3,5-triazine (29.5 g) and tripotassium phosphate (44.6 g) were suspended in toluene (500 ml), dioxane (500 ml) and water (500 ml). Subsequently tri-o-tolylphosphine (913 mg) and palladium acetate (112 mg) were added to the suspension and the reaction mixture was heated for 16 hours under reflux. Then the reaction mixture was worked up to obtain 2-(4,6-diphenyl-(1,3,5)triazin-2-yl)-7'-9H-carbazole-9,9'-spirobifluorene.