| 초록 |
We report that the molecular orientation of a disk shaped Pt(II) complex dopant, platinum(II) octaethylporphyrin (PtOEP), in organic films is almost linearly proportional to the orientation of the host materials. We ascribe this relationship to the parallel alignment of the Pt(II) complex with the host molecules induced by intermolecular interaction, especially, a pi-pi interaction. This would be caused by their planar and conjugated structure, indicating that the intermolecular interaction and steric effect play an important role. This relationship can be applied to obtain a horizontal emitter orientation of other Pt(II) complexes, resulting in highly efficient OLEDs based on Pt(II) phosphors. |
