| 초록 |
New OLED materials such as DPAT-Ph, DPAT-Na and DPAT-An were synthesized by through boronylation, bromination, Suzuki aryl-aryl coupling reaction and Buchwald-Hartwig amination. DPAT-An showed the largest hydrogen repulsion between a core group and a side group and the most twisted structure. Optical properties were investigated by using UV-visible spectra and photoluminescence (PL) spectra. Each compound has dipoles because it has electron donor and acceptor in the molecule and showed the solvatochromism effect. Although there was no big change in the UV-visible spectra, the more the solvent polarity was increased in the PL spectra, the more PL maximum value was red-shifted. In addition, it seemed that the more the conjugation length of a core group was increased, the more each compound tended to red-shift in the UV-visible and the PL spectra. While DPAT-Ph and DPAT-Na emitted strong light in a solution state with the naked eye, DPAT-An emitted very weak light in a solution state, but strong light in a thin film state. As a result of taking an aggregation-induced emission (AIE) active test, it was identified that DPAT-An uniquely showed AIE effect. Thermogravimetric analysis (TGA) and differential scanning calorymetry (DSC) were measured to find thermal stability. As a result, four compounds showed high thermal stability of 342∼413℃ in Td. |
