Abstract: The aim of this study is to explore new phosphorescent materials as highly efficient electroluminescent (EL) emitters in organic light emitting diodes (OLEDs).Iridium (III) complexes were selected as the target compounds for their strong spin orbit coupling that may result in high efficient electro-phosphorescence in OLED at room temperature. Thus, a new iridium pyrazine complex, Ir(MDPP)2(acac)(MDPP=5-methyl-2,3-diphenylpyrazine; acac= acetylacetone) was synthesized by reaction of 5-methyl-2,3-diphenylpyrazine with iridium trichloride hydrate. The procedure of synthesis is simple and easy control. The complex was characterized by elemental analysis, 1H NMR, and mass spectroscopy. The complex shows strong 1MLCT (singlet metal to ligand charge-transfer) and 3MLCT (triplet metal to ligand charge-transfer) absorption at 386 and 507 nm, respectively. The complex also gives rise to a strong photoluminescence at 549 nm at room temperature. These results suggest the complex to be a promising phosphorescent material.

Key words: Phosphorescent material, Heavy metal complex, Triplet, Iridium pyrazine complex, Photoluminescence, Charge transfer