| 초록 |
New carbazole-phenylquinoline (CVz-PhQ) based iridium complexes were designed and synthesized for their application in red phosphorescence organic light emitting diodes (PhOLEDs) and their photophysical, electrochemical and electroluminescence (EL) properties were investigated. The PhOLEDs were fabricated using (EO-CVz-PhQ)2Ir(prz) and (EO-CVz-PhQ)2Ir(mprz) as the emitter and PVK, co-doped with OXD-7 as the electron transport material and TPD as the hole transport material, as the polymer host. The red emissive PhOLEDs, based on the ITO/PEDOT:PSS/TCTA/PVK:OXD-7:TPD:Ir complexes/cathode configuration, exhibited a maximum external quantum efficiency of 3.68 % and a maximum luminance efficiency of 6.69 cd/A. Furthermore, by introducing a TCTA interlayer, the PhOLEDs showed only a slight efficiency roll off of 5.4 % from a low current density (1.81 mA/cm2) to a high current density (44.59 mA/cm2). |
