| 초록 |
Recently, some iridium complexes have been reported to have transition dipole moments oriented preferentially along the horizontal direction. The outcoupling efficiency of the emitted light from the horizontally oriented emitting dipoles in an OLED can reach 45% which is much higher than isotropically oriented transition dipoles. Unfortunately, the origin of the preferred orientation of some phosphorescent dyes and factors influencing the orientation of the transition dipole moments is not fully understood yet. In this talk, we will firstly present the influence of the molecular structure of iridium complexes and host materials on the orientation of the emitting dipoles in phosphorescent dye doped organic layers. Secondly we will show through quantum chemical calculations that the strong intermolecular interactions between phosphorescent dyes and their host molecules lead to preferred dipole orientations. |
