TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (disclosed): Ligand compound (L-H) reacts with iridium trichloride in a solvent, to obtain diiridium dimer compound of formula (I). The obtained diiridium dimer (1) is heated with diphenyl quinoline compound of formula (II) in organic solvent, to obtain organic electroluminescent compound (1). Preferred Compound: The organic electroluminescent compound (1) is preferably of formula (2-6).R21-R22=H, 1-60C alkyl, 6-60C aryl;R23=1-60C alkyl, halogen, cyano, 1-60C alkylsilyl, 6-60C arylsilyl, 1-60C alkoxy, 1-60C alkylcarbonyl, 6-60C arylcarbonyl, phenyl, 1-60C dialkylamino, 6-60C diarylamino, naphthyl, 9,9-di(1-60C)alkylfluorenyl or 9,9-di(6-60C)arylfluorenyl;andm=1-5.R21 and R22 optionally couple via 3-12C alkylene or 3-12C alkenylene optionally having fused ring to form an alicyclic ring, or monocyclic or polycyclic aromatic ring. Preferred Composition: The organic electroluminescent device comprises organic layer(s) interposed between electrode (A) and electrode (B). The organic layer comprises electroluminescent region including organic electroluminescent compound (1) and host compound(s). The organic layer comprises compound(s) chosen from arylamine compounds and styrylarylamine compounds, or metal(s) chosen from group 1, group 2, transition metals of period 4 and 5, lanthanide metals and d-transition elements. Preferred Components: The host compound(s) is chosen from 1,3,5-tricarbazolylbenzene, polyvinylcarbazole, m-biscarbazolylphenyl, 4,4',4",-tri(N-carbazolyl)triphenylamine, 1,3,5-tri(2-carbazolylphenyl)benzene, 1,3,5-tris(2-carbazolyl-5-methoxyphenyl)benzene, bis(4-carbazolylphenyl)silane and aromatic compound of formula: L1L2M1(Q)y or of formula (7-9). The mixed region of reductive dopant and organic substance, or mixed region of oxidative dopant and organic substance is placed on the inner surface of electrode(s).R91-R94=H, halogen, 1-60C alkyl, 6-60C aryl, 4-60C heteroaryl, 5- or 6-membered heterocycloalkyl comprising N, O and/or S, 3-60C cycloalkyl, tri(1-60C)alkylsilyl di(1-60C)alkyl(6-60C)arylsilyl, tri(6-60C)arylsilyl, adamantyl, (7-60C)bicycloalkyl, 2-60C alkenyl, 2-60C alkynyl, cyano, 1-60C alkylamino, 6-60C arylamino, 6-60C ar(1-60C)alkyl, 1-60C alkyloxy(1-60C)alkylthio, 6-60C aryloxy, 6-60C arylthio, 1-60C alkoxycarbonyl, 1-60C alkylcarbonyl, 6-60C arylcarbonyl, carboxyl, nitro or hydroxyl;L1,L2=heterocyclic group of formula (i-ii);M1=bivalent or trivalent metal;y=0 or 1;Q=6-20C aryloxy or tri(6-20C)arylsilyl, optionally substituted by 1-60C alkyl or 6-60C aryl;X=O, S or Se;ring A=oxazole, thiazole, imidazole, oxadiazole, thiadiazole, benzoxazole, benzothiazole, benzimidazole, pyridine or quinoline;ring B=pyridine or quinoline, optionally substituted by 1-60C alkyl, or phenyl or naphthyl optionally substituted by 1-60C alkyl;andR101-R104=H, halogen, 1-60C alkyl (6-60C)aryl, 4-60C heteroaryl, 5- or 6-membered heterocycloalkyl optionally having N, O and S, 3-60C cycloalkyl, tri(1-60C)alkylsilyl, di(1-60C)alkyl(6-60C)arylsilyl, tri(6-60C)arylsilyl, adamantyl, 7-60C bicycloalkyl, 2-60C alkenyl, 2-60C alkynyl, cyano, 1-60C alkylamino (6-60C)arylamino, 6-60C ar(1-60C)alkyl (1-60C)alkyloxy (1-60C)alkylthio, 6-60C aryloxy, 6-60C arylthio, 1-60C alkoxycarbonyl, 1-60C alkylcarbonyl, 6-60C arylcarbonyl, carboxyl, nitro or hydroxyl.R91-R94 is optionally coupled to adjacent substituent via 3-60C alkylene or 3-60C alkenylene optionally having fused ring to form alicyclic ring, or monocyclic or polycyclic aromatic ring. The alkyl, alkenyl, alkynyl, cycloalkyl, heterocycloalkyl, aryl, heteroaryl, arylsilyl, alkylsilyl, alkylamino, or arylamino of R91-R94, or the alicyclic ring, or the monocyclic or polycyclic aromatic ring formed by linking to an adjacent substituent via (C3-C60)alkylene or (C3-C60)alkenylene optionally substituted by having fused ring is optionally substituted by halogen, 1-60C alkyl, 6-60C aryl, 4-60C heteroaryl, 5- or 6-membered heterocycloalkyl comprising N, O and/or S, 3-60C cycloalkyl, tri(1-60C)alkylsilyl di(1-60C)alkyl(6-60C)arylsilyl, tri(6-60C)arylsilyl, adamantyl, (7-60C)bicycloalkyl, 2-60C alkenyl, 2-60C alkynyl, cyano, 1-60C alkylamino, 6-60C arylamino, 6-60C ar(1-60C)alkyl, 1-60C alkyloxy(1-60C)alkylthio, 6-60C aryloxy, 6-60C arylthio, 1-60C alkoxycarbonyl, 1-60C alkylcarbonyl, 6-60C arylcarbonyl, carboxyl, nitro or hydroxyl. When M1 is bivalent metal, y is 0. When M1 is trivalent metal, y is 1. R101-R104 is optionally coupled to adjacent substituent via 3-60C alkylene or 3-60C alkenylene optionally having fused ring to form alicyclic ring, or monocyclic or polycyclic aromatic ring. The alkyl, alkenyl, alkynyl, cycloalkyl, heterocycloalkyl, aryl, heteroaryl, arylsilyl, alkylsilyl, alkylamino, or arylamino of R101-R104, or the alicyclic ring, or the monocyclic or polycyclic aromatic ring formed by linking to an adjacent substituent via (C3-C60)alkylene or (C3-C60)alkenylene optionally substituted by having fused ring is optionally substituted by halogen, 1-60C alkyl (6-60C)aryl, 4-60C heteroaryl, 5- or 6-membered heterocycloalkyl optionally having N, O and S, 3-60C cycloalkyl, tri(1-60C)alkylsilyl, di(1-60C)alkyl(6-60C)arylsilyl, tri(6-60C)arylsilyl, adamantyl, 7-60C bicycloalkyl, 2-60C alkenyl, 2-60C alkynyl, cyano, 1-60C alkylamino (6-60C)arylamino, 6-60C ar(1-60C)alkyl (1-60C)alkyloxy (1-60C)alkylthio, 6-60C aryloxy, 6-60C arylthio, 1-60C alkoxycarbonyl, 1-60C alkylcarbonyl, 6-60C arylcarbonyl, carboxyl, nitro or hydroxyl. Preferred Property: The organic electroluminescent compound has electroluminescent peak with wavelength of blue or green at the same time. Preferred Layer: The organic layer comprises electroluminescent layer and charge generating layer. Preferred Definitions:    L=heterocyclic group of formula (b-u);    R31,R32=H, 1-60C alkyl optionally having halogen, phenyl optionally having 1-60C alkyl, or halogen;    R33-R38=H, 1-60C alkyl, phenyl optionally having 1-60C alkyl, tri(1-60C)alkylsilyl or halogen;    R39-R42=H, 1-60C alkyl, phenyl optionally having 1-60C alkyl;and    R43=1-60C alkyl optionally having halogen, phenyl optionally having 1-60C alkyl, or halogen.    SPECIFIC COMPOUNDS - Specific 1012 organic electroluminescent compounds are disclosed.    EXAMPLE - 4,4'-N,N'-dicarbazole-biphenyl and organic electroluminescent compound (1a) were mixed, to obtain organic layer. The obtained organic layer was provided between the electrodes, to obtain organic electroluminescent device.