| 초록 |
Fluorescent organic light-emitting diode (OLED) has suffered from its low efficiency, since it can utilize 25% of excitons. It has been widely used because of its high color purity, cost-efficiency and stability. Thermally activated delayed fluorescence (TADF) materials can achieve 100% exciton utilization, via reverse intersystem crossing. By utilizing TADF material as an assistant dopant, we can make use of not only the advantages of TADF materials, which can have 100% internal EL efficiency, but also that of fluorescent materials, which have narrow emission and high spectral stability. Therefore, it is necessary to develop new fluorophores with a narrow emission with a small full-width half maximum. The azaacene structure is reported to exhibit absorption and emission spectra with distinctive vibronic structures. Herein, a new rigid azaacene structure was synthesized and it showed a small stokes shift, narrow fluorescence characteristics and high photoluminescence quantum yield. |
