Synthesis and luminescence of a new phosphorescent iridium(III) pyrazine complex

The synthesis and luminescent study of a new iridium pyrazine complex are reported. The indium complex [Ir(MDPP)2(acac)] (MDPP=5-methyl.-2,3-difihenylpyrazine, acac=acetylacetone) shows strong (MLCT)-M-1 (singlet metal-to-ligand charge-transfer) and (MLCT)-M-3 (triplet metal to ligand charge-transfer) absorption at 386 and 507 nm, respectively. Organic light emitting device (OLED) with a configuration of ITO/NPB (30 nm)/NPB: 7% (wt.) Ir(MDPP)(2)(acac) (25 nm)/BCP (10 nm)/Alq(3)(30 nm)/Mg:Ag (mass ratio 10: 1)120 nm/Ag(10 nm) exhibits an external quantum efficiency of 6.02% (power efficiency 9.89 lm W-1) and a maximum brightness of 78,924 cd m(-2). The device also shows high color, purity with a maximum peak at 576 nm without any shoulder. (C) 2005 Elsevier B.V All rights reserved.