Optical and electroluminescent properties of a new green emitting Ir(III) complex

Abstract

We have synthesized and characterized a new green Ir(III) complex, Ir(mpp)(3), with the ligand 3-methyl-2-phenyl-pyridine (Hmpp) and fabricated phosphorescent light emitting devices with the complex as a triplet emissive dopant in PVK. The PL and EL spectra of the PVK film doped with the complex confirm an efficient energy transfer from carbazole excimer to Ir complex. The device showed a maximum external quantum efficiency of 4.5% for 2% Ir(mpp)(3) doping concentrations, and a peak luminance of 25,000 cd/m(2). The device demonstrates the effect brought in by the fine-tuning of the ligand, 2-phenylpyridine in the form of the methyl substitution in the pyridine ring. (C) 2002 Elsevier Science B.V. All rights reserved.