| 초록 |
Fluorescent-based organic-light-emitting diodes(OLEDs) have attracted attention due to high device stability and possibility to be manufactured at low cost in display industry. However, it is necessary to study devices with high color purity through development of narrow fluorescent dopant. The charge transfer (CT) state stabilized by the donor-acceptor type structure shows a large Stokes shift and broad emission spectrum due to the structure distortion between ground state and excited state. Therefore, it is important to develop fluorophores that do not have CT state characteristics. Recently, it is reported azaacene-based fluorophores having a clear vibronic structure of the emission spectrum. In this study, we introduced substituents at various position of azaacene and it is confirmed that the change of CT state characteristics by substituent position. The CT state characteristics were confirmed by solvatochromism experiment and DFT calculation. |
