Molecular crystals of dicoronylene (C₄₈H₂₀), a member of very large polycyclic aromatic hydrocarbons (PAHs), exhibits strong red fluorescence under ambient conditions. This strong fluorescence induced by visible light excitation obscures entire Raman spectrum of dicoronylene. We employed in-situ high-pressure photoluminescence spectroscopy to observe a reversible piezochromic effect, in which the fluorescence exhibits a drastic red-shift with a rapid quenching of intensity. Above 4 GPa, under red-shifted and reduced fluorescence, hidden Raman modes are observed with 532 nm green laser up to 20 GPa. In this work, we show that the application of pressure can finely tune the fluorescence of dicoronylene, allowing the observation of the Raman spectrum with an appropriate laser wavelength and we discovered that dicoronylene has high chemical stability among PAH molecules with multiple aromatic rings.

_{亚二甲苯 (C 48} H ₂₀ ) 分子晶体) 是非常大的多环芳烃 (PAH) 的成员，在环境条件下表现出强烈的红色荧光。这种由可见光激发引起的强荧光掩盖了二聚苯醚的整个拉曼光谱。我们采用原位高压光致发光光谱来观察可逆的压致变色效应，其中荧光表现出剧烈的红移和强度的快速猝灭。高于 4 GPa，在红移和减少的荧光下，使用高达 20 GPa 的 532 nm 绿色激光观察到隐藏的拉曼模式。在这项工作中，我们表明施加压力可以微调二聚苯醚的荧光，