Structure properties of a highly luminescent yellow emitting material for OLED and its application

Abstract

A tris-cyclometalated iridium(III) complex [Ir(DMP)₃] containing 2,6-dimethoxy phenol and an ancillary ligand was successfully prepared and used in the fabrication of organic light-emitting diodes (OLEDs). The absorption, emission, cyclic voltammetry and thermostability of the complex were systematically investigated. The structure of this complex was also characterized using single crystal X-ray diffraction analysis. Its crystal shows a cubic structure. Our device exhibits a yellow emission at 576 nm with a maximum luminescence efficiency of 10 564 cd m⁻¹2 at a voltage of 7 V and a current density of 118 mA cm⁻² respectively. The maximum quantum efficiency is 8.7% at 5.93 mA cm⁻². The Commission Internationale de l′Eclairage (CIE) coordinates were (0.49, 0.50) at a 2 wt% doping concentration and show typical rectifying diode characteristics in the ITO/PEDOS:PSS/PVK:PBD:Ir(DMP)₃/TPBI/Ba/Al device.