NOVELTY - An iridium complex comprises (pentaphenyl)phenyl ligand.    USE - The iridium complex is used as guest material in phosphorescence device. The 9-((pentaphenyl)phenyl) carbazole compound or polymer is used in organic solar cell device; or as hole injection material, hole transport material, emitting material or host material in organic electroluminescence device and/or phosphorescence device. (All claimed)    ADVANTAGE - The complex compound increases efficiency in energy transfer and luminance efficiency, and reduces queching effect caused by concentration by enhancing steric effect. The modification of substituent on phenyl-pyridines adjusts lighting color of phosphorescent material. The (pentaphenyl)phenyl group side chain structure increases steric effect of polymers; thus reducing molecular symmetry and molecular chain aggregation, and preventing from being over red-shifted in fluorescence. The structure decreases rotational degree of freedom. The polymer has excellent thermal stability.    DETAILED DESCRIPTION - An iridium complex comprises (pentaphenyl)phenyl ligand of formula (I).    G=one of 28 compounds, e.g. group of formula (Ia);    R',R"=auxiliary ligands;and    R1-R4=H or electron-withdrawing group.    INDEPENDENT CLAIMS are included for:    (1) formation of iridium complex comprising performing Suzuki coupling reaction between first reagent of formula (A) and second reagent of formula (B) to form first intermediate of formula (C), performing Sonogashira coupling reaction between phenylacetylene and first intermediate to form second intermediate of formula (D), performing Diels-Alder reaction between tetraphenylcyclopentadienone and second intermediate to form third intermediate of formula (E), performing addition reaction between iridium chloride and third intermediate to form halogen-bridged dimer iridium complex of formula (F), and performing substitution reaction between chelating agent and halogen-bridged dimer iridium complex to form iridium complex of formula (IV);    (2) a 9-((pentaphenyl)phenyl) carbazole compound of formula (V);    (3) a polymer derived from 9-((pentaphenyl)phenyl) carbazole compound formed by reaction between organic compound with 9-((pentaphenyl)phenyl) carbazole compound and reactive monomer(s); and    (4) formation of 9-((pentaphenyl)phenyl) carbazole comprising performing substitution reaction between carbazole compound and dihalo compound X1-Ph-X2 to form first intermediate of formula (VII), performing Sonogashira coupling reaction between phenylacetylene and first intermediate to form second intermediate of formula (VIII), and performing Diels-Alder reaction between tetraphenylcyclopentadienone and second intermediate to form 9-((pentaphenyl)phenyl)carbazole of formula (IX).    The reactive monomer comprises one of eight compounds, e.g. group of formula (VI).    Z=group VA element;    X1-X3=Cl, Br or I;    R=H, alkyl or aryl;    R5,R6=R1;    G1,G2=H, COOH, OH, NH2, double bond group, triple bond group, halo, -B(OR)2, -Ar-G3, or one of three compounds e.g. group of formula (IIa);    R1=alkyl or aryl group;and    G4=G1 except H and -Ar-G3.    Ar=aryl group;and    G3=H, COOH, OH, NH2, double bond group or triple bond group.    DESCRIPTION OF DRAWING(S) - The drawing shows a graph of voltage-current curves for organic LED devices.