NOVELTY - 3,4-Diphenyl-quinoline iridium organic electroluminescent complexes (I) are new.    USE - (I) is useful in organic solar cell and organic electroluminescent devices (all claimed), which are organic display. (I) is useful in organic light-emitting diode panels of medium to large size.    ADVANTAGE - (I) provides organic electroluminescent device having excellent luminous efficiency and improved lifetime. (I) has a backbone of more excellent electroluminescence properties and thermal stability than conventional phosphorescent materials. (I) provides higher quantum efficiency and lower operation voltage as compared to conventional materials.    DETAILED DESCRIPTION - 3,4-Diphenyl-quinoline iridium organic electroluminescent complexes of formula (I) are new.    L = organic ligand;    R1-R4 = H, 1-60C alkyl, 1-60C alkoxy, 3-60C cycloalkyl, halo, tri(1-60C)alkylsilyl or tri(6-60C)arylsilyl;    R5, R6 = H, 1-60C alkyl, halo or 6-60C aryl; either    R7, R8 = H, 1-60C alkyl (optionally substituted with halo), 6-60C aryl, halo, CN, tri(1-60C)alkylsilyl, tri(6-60C)arylsilyl, 1-60C alkoxy, 1-60C alkylcarbonyl, 6-60C arylcarbonyl, di(1-60C)alkylamino or di(6-60C)arylamino; or    R7R8 = linked 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 (where the alkyl or aryl of R7 and R8, or the alicyclic ring, or the monocyclic or polycyclic aromatic ring may be further substituted by one or more substituent comprising 1-60C alkyl, halo, CN, 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 spiro(fluorene-9,2'-indane) moiety); and    n = 1-3.    An INDEPENDENT CLAIM is included for an organic electroluminescent device comprising a first electrode, a second electrode and at least one organic layer interposed between the first electrode and the second electrode, where the organic layer comprises an electroluminescent region comprising (I) and one or more hosts comprising 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, biphenyl compound of formula (a), 2-phenyl-benzothiazole aluminum complex of formula (b), 2-methyl-quinoline aluminum complex of formula (c) or metal compound of formula (L1L2M1(Q)y).    R91-R94, R101-R104 = H, halo, 1-60C alkyl, 6-60C aryl, 4-60C heteroaryl, 5- or 6-membered heterocycloalkyl (containing one or more heteroatoms of N, O 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, CN, 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, NO2 or OH (where each of R91 through R94 may be linked to an adjacent substituent via 3-60C alkylene or 3-60C alkenylene with or without a fused ring to form an alicyclic ring, or a monocyclic or polycyclic aromatic ring, and the alkyl, alkenyl, alkynyl, cycloalkyl, heterocycloalkyl, aryl, heteroaryl, arylsilyl, alkylsilyl, alkylamino, or arylamino, or the alicyclic ring, or the monocyclic or polycyclic aromatic ring may be further substituted by one or more substituents comprising halo, 1-60C alkyl, 6-60C aryl, 4-60C heteroaryl, 5-or 6-membered heterocycloalkyl (containing one or more heteroatoms of N, O 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, CN, 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, NO2 or OH);    L1, L2 = phenyl group of formula (d) or (e);    M1 = bivalent or trivalent metal;    Q = 6-60C aryloxy or tri(6-60C)arylsilyl (both optionally substituted by 1-60C alkyl or 6-60C aryl);    X = O, S or Se;    A = oxazole, thiazole, imidazole, oxadiazole, thiadiazole, benzoxazole, benzothiazole, benzimidazole, pyridine or quinoline; and    B1 = pyridine or quinoline (both optionally substituted by 1-60C alkyl, or phenyl or naphthyl (both optionally substituted by (1-60C)alkyl)).    Provided that y is 0 when M1 is a bivalent metal, while y is 1 when M1 is a trivalent metal.