TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (disclosed): The compound is prepared by (A) mixing ligand containing compound (1) with indium trichloride in a solvent (preferably alcohol or mixed solvent of alcohol/water) at molar ratio of 1:2-3, heating the mixture under reflux before isolation diiridium dimer, heating the isolated diiridium dimer with primary ligand compound in the organic solvent to provide organic phosphorescent iridium compound having the ratio of primary ligand to subsidiary ligand of 1:2 as the final product, and carrying out reaction using silver triflate, sodium carbonate, or sodium hydroxide mixed with organic solvent; or (B) mixing iridium trichloride and primary ligand compound in a solvent at molar ratio of 1:2-3, heating the mixture under reflux before isolating diiridium dimer, heating the isolated diiridium dimer with subsidiary ligand compound in organic solvent to provide organic phosphorescent iridium compound having ratio of primary ligand to subsidiary ligand to 2:1 as the final product, determining the molar ratio of primary ligand compound and subsidiary ligand in the final product using molar ratio of reacting depending on the composition, carrying out reaction with silver triflate, sodium carbonate, or sodium hydroxide mixed with organic solvent. Preferred Components: The organic EL compound is of formulae (4)-(7). The ligand comprises one or more of 20 compounds, e.g. formulae (IB-ID).R11-R18=1-60C alkyl, halo, cyano, tri(1-60C) alkylsilyl, tri(6-60C)arylsilyl, 1-60C alkoxy, 1-60C alkyl carbonyl, 6-60C aryl carbonyl, di(1-60C)alkylamino, di(6-60C) arylamino, Ph, naphthyl, anthryl, fluorenyl, spirobifluorenyl, or indene fluorene containing compound of formula (Ia);R19-R20=H, 1-60C alkyl or 6-60C aryl or may be linked via (3-12C) alkylene or (3-12C) alkenylene optionally with a fused ring to form an alicyclic ring, monocyclic or polycyclic aromatic ring;R21=1-60C alkyl, halo, CN, tri(1-60C) alkylsilyl, tri(6-60C)arylsilyl, 1-60C alkoxy, 1-60C alkylcarbonyl, 6-60C arylcarbonyl, Ph, di(1-60C)alkylamino, di(6-60C)arylamino, naphthyl, 9,9-di(1-60C) alkylfluorenyl, or 9,9-di(5-60C)aryl fluorenyl;R31-R32=H, 1-60C alkyl optionally with halo substituent(s), Ph optionally with 1-60C alkyl substituent(s) or halo;R33-R39=H, 1-60C alkyl, Ph optionally with 1-60C alkyl substituent(s), tri(1-60C) alkylsilyl or halo;R40-R43=H, 1-60C alkyl, Ph optionally with 1-60C alkyl substituent(s);R44=1-60C alkyl, Ph optionally with 1-60C alkyl substituents or halo;andm=1-5. EXAMPLE - No suitable example given.