Fluorescence of Rhodamine 101 under High Pressures

The fluorescence spectra of both Rhodamine 101 powder and solution (mixture of methanol, ethanol and water as solvent) have been measured under high pressures. It has been found that the emission character of Rhodamine 101 powder is quite different from that in solvent under high pressures. For Rhodamine 101 powder, the fluorescence intensity drops quickly with the increase of pressure and disappears almost at 8 GPa, while the emission peaks move redward dramatically (about 100 nm within 8 GPa). For Rhodamine 101 solution, the fluorescence intensity decreases slowly with the increase of pressure; the emission intensity at 13 GPa is about 10% of that at the ambient pressure. Moreover, the emission peak moves redward comparatively slowly (about 50 nm within 13 GPa). The change of molecular structure and special solvent effect are, respectively, the primary factors that influence the emission character of Rhodamine 101 powder and solution under high pressures.