TECHNOLOGY FOCUS - ELECTRONICS - Preferred Device: The organic electroluminescent device further comprises compounds having electroluminescent peak with wavelength of blue and green at the same time. The organic layer comprises an electroluminescent layer and a charge generating layer. In the device, a mixed region of reductive dopant and organic substance, or a mixed region of oxidative dopant and organic substance is placed on the inner surface of one or both electrode(s) among the pair of electrodes.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The organic layer comprises at least one metal selected from organic metals of Group 1, Group 2, 4th period and 5th period transition metals, lanthanide metals and d-transition elements.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (disclosed): 3 Methods for the preparation of (I) are given e.g. preparation of (I) involves mixing iridium trichloride (IrCl3) and subsidiary ligand compound (L1-H) in a solvent e.g. alcohol or a mixed solvent of alcohol/water, heating the mixture under reflux before isolating diiridium dimer, followed by heating the isolated diiridium dimer with a primary ligand compound in organic solvent to give (I) (where n is 1). Preferred Components: The compound (I) is preferably compounds of formulae (Ic), (Id), (If) and (Ig). The organic layer comprises at least one compound selected from arylamine compounds and styrylarylamine compounds.R21 and R22=H, 1-20C alkyl, or 6-20C aryl;R23=1-20C alkyl, halogen, cyano, tri(1-20C)alkylsilyl, tri(6-20C)arylsilyl, 1-20C alkoxy, 1-20C alkylcarbonyl, 6-20C arylcarbonyl, phenyl, di-1-20C alkylamino, di-6-20C arylamino, naphthyl, 9,9-di-1-20C alkylfluorenyl or 9,9-di-6-20C arylfluorenyl;andm=1-5.R21 and R22 are optionally linked each other via 3-12C alkylene or 3-12C alkenylene with or without a fused ring to form an alicyclic ring, or a monocyclic or polycyclic aromatic ring. Preferred Definitions:    L1=a compound selected from 20 compounds as given in the specification e.g. -O-C(R32)=C(R33)-C(=O)-R31, -O-C(=O)-pyridine (pyridine is substituted by R34), 2-(1H-pyrrol-2-yl)-pyridin-1-yl (pyridine ring is substituted by R34), 2-(1H-imidazol-2-yl)-pyridin-1-yl (pyridine ring is substituted by R34), 2-pyridin-2-yl-1H-benzoimidazol-1-yl (pyridine ring is substituted by R34), 2-phenyl-1H-imidazol-3-yl (substituted at Ist nitrogen by R35, and the phenyl ring is substituted by R34), 2-phenyl-1H-benzoimidazol-1-yl (phenyl ring is substituted by R36), 2-(phenyl-2-yl)-pyridine (pyridine and phenyl rings are substituted by R34 and R36 respectively);    R31 and R32=H, 1-20C alkyl (optionally substituted by halogen), phenyl (optionally substituted by 1-20C alkyl), or halogen;and    R33-R36=phenyl (optionally substituted by 1-20C alkyl), H, 1-20C alkyl, tri(1-20C)alkylsilyl or halogen.    SPECIFIC COMPOUNDS - 997 Compounds are disclosed as (I) e.g. bis (5-phenyl-2-(4-phenyl-quinolin-2-yl) phenylato) iridium (III) acetyl acetoacetonate (IA); bis (5-methyl-2-(4-phenyl-quinolin-2-yl) phenylato) iridium (III) acetyl acetoacetonate; bis (5-fluoro-2-(4-phenyl-quinolin-2-yl) phenylato) iridium (III) acetyl acetoacetonate; bis (5-cyano-2-(4-phenyl-quinolin-2-yl) phenylato) iridium (III) acetyl acetoacetonate; bis (5-tert-butyl-2-(4-phenyl-quinolin-2-yl) phenylato) iridium (III) acetyl acetoacetonate.    EXAMPLE - 2-Biphenyl-3-yl-4-phenyl-quinoline (13.4 g) and iridium chloride (IrCl3) (5.1 g) were dissolved in 2-ethoxyethanol (220 ml) and distilled water (74 ml), and the solution was stirred under reflux for 24 hours. The mixture was cooled at room temperature. After work-up, (bis (5-phenyl-2-(4-phenyl-quinolin-2-yl) phenylato) Ir(III)Cl)2 (9.1 g) was obtained. (Bis (5-phenyl-2-(4-phenyl-quinolin-2-yl) phenylato) Ir(III)Cl)2 (9.1) was reacted with 2,4-pentanedione (1.0 g) and sodium carbonate (Na2CO3) (2.6 g) in presence of 2-ethoxyethanol (240 ml), and the solution was heated for 4 hours. The reaction mixture was cooled to room temperature. After work-up, bis (5-phenyl-2-(4-phenyl-quinolin-2-yl) phenylato) iridium (III) acetyl acetoacetonate (5.7 g, 16% yield) was obtained as red crystal.