TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preparation: No preparation method is given. Preferred Components: (I) are homoleptic or heteroleptic, or neutral; and of formula (M1a(L1a)x(L2a)y(L3a)z), preferably Ir(L1a)2(L2a), Pt(L1a)2 or Pt(L1a)(L2a).Either L2a = second ligand comprising Q1a; andL3a = third ligand; orL1a connected to the other L1a or L2a = tetradentate ligand;Q1a = e.g. -O=C(R1n)-CH(R3n)-C(R2n)=O- and N-containing moieties of formula (b1)-(b6), or -O-C(CH(R1s)(R2s))=C(R5s)-C(CH(R3s)(R4s)=O-;x = 1-3, preferably 2;y = 0-2, preferably 1;z = 0-2;x+y+z = oxidation state of the metal M2a; eitherR1n-R4n = H, deuterium, halo, alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acid, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, and/or phosphino, where R1n-R4n is mono, di, tri or tetra substitution, or no substitution; ortwo adjacent substituents of R1n-R4n = ring or multidentate ligand;R1s-R4s = alkyl, cycloalkyl, aryl or heteroaryl, where at least one of R1s-R4s has at least two C-atoms; andR5s = R1n. Preferred Definitions:    M1a = Ir, Rh, Re, Ru, Os, Pt, Au or Cu, preferably Ir or Pt;    ring B1a = phenyl or 6-membered aryl or heteroaryl having substitutions on both ortho positions;    R1s = CH3, C2H5, propyl, 1-methylethyl, butyl, 1-methylpropyl, 2-methylpropyl, pentyl, 1-methylbutyl, 2-methylbutyl, 3-methylbutyl, 1,1-dimethylpropyl, 1,2-dimethylpropyl, 2,2-dimethylpropyl, cyclopentyl, cyclohexyl, phenyl, 2,6-dimethylphenyl, 2,4,6-trimethylphenyl, and/or 2,6-diisopropylphenyl; and    L1a = e.g. pyrrol-1-yl moiety of formulae (a1)-(a10).    SPECIFIC COMPOUNDS - 113 Compounds (I) are specifically claimed e.g. bis(1-(2,6-diisopropyl-phenyl)-2-pyridin-2-yl-1H-indole)-(3,7-diethyl-6-oxo-non-4-en-4-ol) iridium of formula (Ia), tris(1-(1-(2-isopropyl-phenyl)-1H-pyrrol-2-yl)-3-methyl-3H-imidazol-1-ium) iridium, tris(1-(1-(2,6-diisopropyl-phenyl)-1H-pyrrol-2-yl)-3-methyl-3H-imidazol-1-ium) iridium, tris(1-(1-(2,6-Diisopropyl-phenyl)-5-methyl-1H-pyrrol-2-yl)-3-methyl-3H-imidazol-1-ium) iridium, and tris(1-(1-(2-isopropyl-phenyl)-5-methyl-1H-pyrrol-2-yl)-3-methyl-3H-imidazol-1-ium) iridium.    EXAMPLE - 0.33 g Tetrakis(1-(2,6-diisopropyl-phenyl)-2-pyridin-2-yl-1H-indole) diiridium dichloride (dimer), 0.38 g 3,7-diethylnonane-4,6-dione and 6 ml 2-ethoxyethanol were combined in a flask. Nitrogen was bubbled directly into the solution for 15 minutes and 0.24 g potassium carbonate was then added and the reaction was heated at 60 degrees C over-night. The reaction was filtered through Celite (RTM: Diatomaceous earth) using dichloromethane until the dark red color came off. The sample was purified with silica gel, which was preconditioned with 75/20/5 heptane/triethyl amine/dichloromethane solvent system then using 95/5 heptane/dichloromethane solvent system. The combined fractions were concentrated down. The dark red solid was triturated in 50 ml methanol to obtain bis(1-(2,6-diisopropyl-phenyl)-2-pyridin-2-yl-1H-indole)-(3,7-diethyl-6-oxo-non-4-en-4-ol) iridium complex.