TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preparation: No preparation method is given. Preferred Components: (I) have a narrower full width half maximum than iridium compounds of formula (A) or (B). (I) have a lower sublimation temperature than (A) or (B). The organic layer is an emissive layer and (I) are emissive compounds. The emissive layer further comprises a host. The host is a dibenzothiophene compound of formula (H1) or triphenylene compound of formula (H2).R11, R22 = mono, di, tri or tetra substitutions comprising alkyl, alkoxy, amino, alkenyl, alkynyl, arylalkyl, aryl or heteroaryl, or no substitution, where at least one of R1 and R2 includes a triphenylene group; andR111-R333 = H, non-fused aryl group or non-fused heteroaryl group having one or more meta-substituents, where at least one of R111-R333 is not H, and each meta-substituent is a non-fused aryl or heteroaryl group optionally substituted with substituents comprising non-fused aryl, non-fused heteroaryl, or alkyl. Preferred Definitions:    n = 1;    R4 = H or methyl;    R2, R3, R5 = H;    L1 = 1-methyl-2-phenyl-1H-benzoimidazole, 1-ethyl-2-phenyl-1H-benzoimidazole, 1-isopropyl-2-phenyl-1H-benzoimidazole, 1-isobutyl-2-phenyl-1H-benzoimidazole, 1-(2,2-dimethyl-propyl)-2-phenyl-1H-benzoimidazole, 1,2-diphenyl-1H-benzoimidazole, 2-phenyl-1-o-tolyl-1H-benzoimidazole, 1-(2,6-dimethyl-phenyl)-2-phenyl-1H-benzoimidazole, 2-phenyl-1-(2,4,6-trimethyl-phenyl)-1H-benzoimidazole, 1-(3,5-dimethyl-biphenyl-4-yl)-2-phenyl-1H-benzoimidazole, 1-(2-isopropyl-phenyl)-2-phenyl-1H-benzoimidazole, 1-(2,6-diisopropyl-phenyl)-2-phenyl-1H-benzoimidazole, 2-phenyl-1-(2,4,6-triisopropyl-phenyl)-1H-benzoimidazole, 1-(3,5-diisopropyl-biphenyl-4-yl)-2-phenyl-1H-benzoimidazole, 1-(2-isobutyl-6-isopropyl-phenyl)-2-phenyl-1H-benzoimidazole, 1-(2,6-diisobutyl-phenyl)-2-phenyl-1H-benzoimidazole, 1-(2-(2,2-dimethyl-propyl)-phenyl)-2-phenyl-1H-benzoimidazole, 1-(2,6-bis-(2,2-dimethyl-propyl)-phenyl)-2-phenyl-1H-benzoimidazole, 1,5-dimethyl-2-phenyl-1H-benzoimidazole, 1-ethyl-5-methyl-2-phenyl-1H-benzoimidazole, 1-isopropyl-5-methyl-2-phenyl-1H-benzoimidazole, 1-isobutyl-5-methyl-2-phenyl-1H-benzoimidazole, 1-(2,2-dimethyl-propyl)-5-methyl-2-phenyl-1H-benzoimidazole, 5-methyl-1,2-diphenyl-1H-benzoimidazole, 5-methyl-2-phenyl-1-o-tolyl-1H-benzoimidazole, 1-(2,6-dimethyl-phenyl)-5-methyl-2-phenyl-1H-benzoimidazole, 5-methyl-2-phenyl-1-(2,4,6-trimethyl-phenyl)-1H-benzoimidazole, 1-(3,5-dimethyl-biphenyl-4-yl)-5-methyl-2-phenyl-1H-benzoimidazole, 1-(2-isopropyl-6-methyl-phenyl)-5-methyl-2-phenyl-1H-benzoimidazole, 1-(2,6-diisopropyl-phenyl)-5-methyl-2-phenyl-1H-benzoimidazole, 5-methyl-2-phenyl-1-(2,4,6-triisopropyl-phenyl)-1H-benzoimidazole, 1-(2-(1,2-dimethyl-propyl)-phenyl)-5-methyl-2-phenyl-1H-benzoimidazole, 1-(2,6-diisobutyl-phenyl)-5-methyl-2-phenyl-1H-benzoimidazole, 1-(2-(2,2-dimethyl-propyl)-phenyl)-5-methyl-2-phenyl-1H-benzoimidazole or 1-(2,6-bis-(2,2-dimethyl-propyl)-phenyl)-5-methyl-2-phenyl-1H-benzoimidazole groups; and    L2 = 2-phenyl-pyridine, 3-methyl-2-phenyl-pyridine, 4-methyl-2-phenyl-pyridine, 5-methyl-2-phenyl-pyridine, 2-methyl-6-phenyl-pyridine, 3,4-dimethyl-2-phenyl-pyridine, 3,5-dimethyl-2-phenyl-pyridine, 2,4-dimethyl-6-phenyl-pyridine, 4,5-dimethyl-2-phenyl-pyridine, 2,3-dimethyl-6-phenyl-pyridine, 3,6-dimethyl-2-phenyl-pyridine, 3,4,5-trimethyl-2-phenyl-pyridine, 2,3,4-trimethyl-6-phenyl-pyridine, 3,4,6-trimethyl-2-phenyl-pyridine, 2,3,4,5-tetramethyl-6-phenyl-pyridine, 3-methyl-2-m-tolyl-pyridine, 4-methyl-2-m-tolyl-pyridine, 5-methyl-2-m-tolyl-pyridine, 2-methyl-6-m-tolyl-pyridine, 3,4-dimethyl-2-m-tolyl-pyridine, 3,5-dimethyl-2-m-tolyl-pyridine, 2,4-dimethyl-6-m-tolyl-pyridine, 4,5-dimethyl-2-m-tolyl-pyridine, 2,3-dimethyl-6-m-tolyl-pyridine, 3,6-dimethyl-2-m-tolyl-pyridine, 3,4,5-trimethyl-2-m-tolyl-pyridine, 2,3,4-trimethyl-6-m-tolyl-pyridine, 3,4,6-trimethyl-2-m-tolyl-pyridine, 2-m-tolyl-pyridine, 2-biphenyl-3-yl-pyridine, 2,5-diphenyl-pyridine, 2,4-diphenyl-pyridine or 2-biphenyl-4-yl-pyridine group.    SPECIFIC COMPOUNDS - 9 Compounds (I) are specifically claimed e.g. iridium compounds of formulae (Ia)-(Ie).    EXAMPLE - Iridium compound of formula (X) (1.4 g) and 1-neopentyl-2-phenyl-1H-benzo(d)imidazole (1.6 g) were mixed with ethanol (30 ml) in a three-neck flask under nitrogen. The mixture was heated up to reflux for 24 hours. After cooled to room temperature, the precipitate was collected by filtration to give iridium compound (Ia) (0.3 g).