TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The electronic device is an organic electroluminescent device, where (I) is used as an emitting compound in an emitting layers optionally in combination with a matrix material.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Claimed): The preparation of (I) comprises reacting the corresponding free ligands with metal alkoxide derivative of formula (M(OR1)n) (IV), metal ketoketonate derivative of formula (IVa), metal halide derivative of formula (Mhaln) (IVb), and dimeric metal complexes of the formula (Ivc) or metal compound which carries both alkoxide, halide, hydroxy and ketoketonate. Preferred Definitions:    M = Ir;    V1 = S;    Y1 = O; and    L1 = carbon monoxide, nitric oxide, alkyl cyanides, aryl cyanides, alkyl isocyanides, aryl isocyanides, amines, phosphines, phosphites, arsines, stibines, nitrogen-containing heterocycles, carbenes, hydride, deuteride, F-, Cl-, Br-, I-, alkyl, aryl acetylide, cyanide, cyanate, isocyanate, thiocyanate, isothiocyanate, aliphatic or aromatic alcoholates, aliphatic or aromatic thioalkoholate, amide, carboxylate, aryl, O2-, S2-, carbide, nitride, diamine, imine, diphosphine, ,3-diketonate derived from 1,3-diketone, 3-ketonate derived from 3-ketoesters, carboxylate derived from aminocarboxylic acid, salicyliminate derived from salicylimines, dialcoholate, dithiolate, borate, nitrogen containing heterocycle or bidentate monoanionic ligand which exhibits cyclometalated five- or six-membered ring with at least one metal-carbon bond.    SPECIFIC COMPOUNDS - 109 Compounds (I) are disclosed, e.g. tris-(1-3(8,8-dimethyl-8H-indolo(3,3,1-de)acridin-3-yl)phen-1-yl)-isquinolinato)iridium (III) (Ia), (O.O'-acetylacetonato)-bis-(1-(3-(8,8-dimethyl-8H-indolo-(-de)acridin-3-yl)phen-1-y l)isquinolinato)iridium(III), bis-(1-(3-(8,8-dimethyl-8H-indolo(3,2,1-de)acridin-3-yl)phen-1-yl)isquinolinato)-(2-phenylpyridinato)iridium(III), bis-(1-(3-(8,8-dimethyl-8H-indolo(3,2,1- de)acridin-3-yl)phen-1-yl)pyridinato)platinum(ll) and tris-(3-(3-(isoquinolin-1-yl)phenyl)-8,8-dimethyl-6-phenyl-8H-indolo(3,2,1-de)acridine)iridium (III).    EXAMPLE - 7.50 g Ir (L1 Br) 3, 7.10 g 8,8-dimethyl-8H-indolo(3,2,1-de) acridin-3-yl-boronic acid, 12.62 g potassium phosphate monohydrate, 49.4 mg palladium (II) acetate and 0.3 ml tri-n-butylphosphine solution (1 M in toluene) were provided in a mixture of 150 ml toluene, 100 ml dioxane and 175 ml water with vigorous stirring and heated for 15 hours to reflux to obtain (Ia).