| 초록 |
To improve efficiency of polymer based electrophosphorescent organic light-emitting devices (OLEDs), highly efficient energy transfer should occur between a host polymer and phosphorescent. For highly efficient Foster and Dexter energy transfer, sufficient spectrum overlap between a host polymer and a dopant as well as compatibility of a host polymer with a dopant are required. To satisfy these requirements, we have employed approaches by two ways. First new polyfluorene derivatives were synthesized. Polar side chains were introduced to the polyfluorene to improve compatibility between the polymer and phosphorescent dyes. In addition, the conjugation length of the polyfluorene backbone was controlled by introducing bulky substituents to increase the spectrum overlap between the polymer host and dyes. Secondly, new fac-tris(2-phenylpyridine) iridium(III)[Ir(ppy3)] derivatives were synthesized. We have introduced non-polar alkyl chains such as octyl groups into Ir(ppy)3. The complexes showed enhanced compatibility in the conjugated polymer matrix leading to an increase of the energy transfer. |
