TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (disclosed): A ligand compound of formula: L-H, and iridium trichloride or heated in solvent to isolate diiridium dimer of formula (i). The obtained compound is reacted with primary ligand compound of formula (ii) in organic solvent to obtain 4,6-diphenyl-quinoline compound.Preferred Compound: The 4,6-diphenyl-quinoline compound is preferably of formulae (2-7).R11-R18 = H, (1-60C)alkyl, halo, cyano, tri(1-60C)alkylsilyl, tri(6-60C)arylsilyl, (1-60C)alkoxy, (1-60C)alkylcarbonyl, (6-60C)arylcarbonyl, di(1-60C)alkylamino, di(6-60C)arylamino, phenyl, naphthyl, anthryl, fluorenyl, spirobifluorenyl or fluorene-containing group (1a), alkyl, phenyl, naphthyl, anthryl or fluorenyl of R11-R18 are optionally substituted by (1-60C)alkyl optionally substituted by halo, (1-60C)alkoxy, halo, tri(1-60C)alkylsilyl, tri(6-60C)arylsilyl, (1-60C)alkylcarbonyl, (6-60C)arylcarbonyl, di(1-60C)alkylamino, di(6-60C)arylamino or (6-60C)aryl;R19,R20 = H, (1-60C)alkyl or (6-60C)aryl, or R19 and R20 optionally couple through (3-12C)alkylene or (3-12C)alkenylene with or without fused ring to form alicyclic ring, or monocyclic or polycyclic aromatic ring;andm = 1-5.Preferred Layer: An organic electroluminescent device has a electrode (a1), a electrode (a2), and at least one organic layer interposed between electrodes.The organic layer comprises an electroluminescent portion containing an organic electroluminescent compound, and one or more host(s) chosen from 1,3,5-tricarbazolyl benzene, polyvinyl carbazole, m-biscarbazolyl phenyl, 4,4',4"-tri(N-carbazolyl)triphenyl amine, 1,3,5-tri(2-carbazolyl phenyl)benzene, 1,3,5-tris(2-carbazolyl-5-methoxyphenyl) benzene, bis(4-carbazolylphenyl)silane, bis phenol compound of formula (8), aluminum complex of formulae (9 or 10), and nitrogen-containing metal complex of formula: L1L2M1(Q)y. An organic electroluminescent device has the electroluminescent peak with wavelength of blue and green. The organic electroluminescent device has an organic layer having an electroluminescent layer and a charge generating layer.R91-R94 = H, halo, (1-60C)alkyl, (6-60C)aryl, (4-60C)heteroaryl, 5-or-6-membered heterocycloalkyl containing nitrogen, oxygen or sulfur, (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)aryl(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 optionally linked to adjacent substituent through (3-60C)alkylene or (3-60C)alkenylene with or without fused ring to form alicyclic ring, or monocyclic or polycyclic aromatic ring, the alkyl, alkenyl, alkynyl, cycloalkyl, heterocycloalkyl, and aryl, heteroaryl, arylsilyl, alkylsilyl, alkylamino or arylamino of R91-R94, or alicyclic ring, or monocyclic or polycyclic aromatic ring linkage to adjacent substituent through (3-60C)alkylene or (3-60C)alkenylene with or without fused ring are optionally substituted by halo, (1-60C)alkyl, (6-60C)aryl, (4-60C)heteroaryl, 5-or-6-membered heterocycloalkyl containing nitrogen, oxygen and sulfur, (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)aryl(1-60C)alkyl, (1-60C)alkyloxy, (1-60C)alkylthio, (6-60C)aryloxy, (6-60C)arylthio, (1-60C)alkoxycarbonyl, (1-60C)alkylcarbonyl, (6-60C)aryl carbonyl, carboxyl, nitro or hydroxyl;L1,L2 = aromatic group of formulae (2a or 2b);M1 = bivalent or trivalent metal;Q = (6-60C)aryloxy or tri(6-60C)arylsilyl optionally substituted by (1-60C)alkyl or (6-60C)aryl;X = oxygen, sulfur or selenium;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, halo, (1-60C)alkyl, (6-60C)aryl, (4-60C)heteroaryl, 5-or-6-membered heterocycloalkyl containing nitrogen, oxygen and sulfur, (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)aryl(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, or each of R101-R104 optionally linked to adjacent substituent through (3-60C)alkylene or (3-60C)alkenylene with or without fused ring to form alicyclic ring, or monocyclic or polycyclic aromatic ring, pyridine or quinoline optionally form chemical bond together with R101 to form fused ring, and alkyl, alkenyl, alkynyl, cycloalkyl, heterocycloalkyl, aryl, heteroaryl, arylsilyl, alkylsilyl, alkylamino, or arylamino of ring A and R101-R104, or alicyclic ring, or monocyclic or polycyclic aromatic ring link to adjacent substituent through (3-60C)alkylene or (3-60C)alkenylene with or without fused ring are optionally substituted by halo, (1-60C)alkyl, (6-60C)aryl, (4-60C)heteroaryl, 5-or-6-membered heterocycloalkyl, (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)aryl(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 and hydroxyl.When y is 0, M1 is bivalent metal, and when y is 1, M1 is trivalent metal. Preferred Component: The organic layer further comprises arylamine compound and styrylarylamine compound, or metal chosen from organic metal of Group 1, Group 2, fourth period and fifth period transition metal, lanthanide metal and d-transition element. Preferred Definitions:    R2=(1-60C)alkyl, halo, cyano, tri(1-60C)alkylsilyl, tri(6-60C)arylsilyl, (1-60C)alkoxy, (1-60C)alkylcarbonyl, (6-60C)arylcarbonyl, phenyl, di(1-60C)alkylamino, di(6-60C)arylamino, naphthyl, 9,9-di(1-60C)alkylfluorenyl or 9,9-di(6-60C)arylfluorenyl;    L=nitrogen-containing aromatic group of formulae (a-t);    R31,R32=H, (1-60C)alkyl optionally substituted by halo, phenyl optionally substituted by (1-60C)alkyl, or halo;    R33-R39=H, (1-60C)alkyl, phenyl optionally substituted by (1-60C)alkyl, tri(1-60C)alkylsilyl or halo;    R40-R43=H, (1-60C)alkyl, or phenyl optionally substituted by (1-60C)alkyl;and    R44=(1-60C)alkyl, phenyl optionally substituted by (1-60C)alkyl, or halo.    SPECIFIC COMPOUNDS - 1017 Specific 4,6-diphenyl-quinoline compounds are disclosed, such as 2,4,6-triphenyl-quinoline iridium complex of formula (104), trifluoro 2,4,6-triphenyl-quinoline iridium complex of formula (103), and methoxy 2,4,6-triphenyl-quinoline iridium complex of formulae (100-102).    EXAMPLE - 2,4,6-Triphenyl-quinoline (in g) (0.8) and iridium trichloride (0.3), were dissolved in 2-ethoxy ethanol (12 ml) and water (4 ml) and refluxed for 24 hours to obtain diiridium compound of formula (iv). The obtained compound (0.6), 2,4-pentanedione (0.1 ml) and sodium carbonate (0.2) were dissolved in 2-ethoxy ethanol (10 ml), heated for 4 hours and purified to obtain red crystal of 2,4,6-triphenyl-quinoline iridium complex (104) in yield of 60%.