| 초록 |
Polycyclic aromatic hydrocarbons (PAHs) are flat aromatic molecules composed of only carbon and hydrogen atoms. They are popular for their high thermal, chemical, and photo-stability, rigid planar structures, and photophysical characteristics which enable applications in many devices such as dyes, optical sensors, light-emitting diodes, field-effect transistors. However, a well-known problem with PAHs is their strong aggregation via π-π stacking, hence making them insoluble and difficult to handle. Also, owing to the π-π stacking, their emission in the solid-state is significantly suppressed. Herein, a series of PAHs – pyrene, coronene, hexabenzocoronene – were synthesized. The ortho-substituted aromatic rings adjacent to the core of PAHs inhibited the π-π stacking through steric hindrance. The edge-functionalized PAHs showed enhanced emission properties, which were investigated in both solution and solid-state with UV-Vis spectroscopy and photoluminescence (PL) spectroscopy. |
