Effects of hydrostatic pressure on the excitation-emission matrix (EEM) of a series of pure PAHs

• Published in: Journal of luminescence 2017-06, Vol.186, p.77-86
• Main Authors: Sun, Zhi-juan, Wang, Jie, Ye, Shu-ming, Jiang, Chun-yue, Chen, Hang
• Format: Article
• Language: English
• Subjects: EEM; Emission-excitation matrix; Hydrostatic pressure; PAHs
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2017.02.018

The effects of hydrostatic pressure on the EEM of a series of pure PAHs (naphthalene, fluorene, phenanthrene, acenaphthene, fluoranthene, and anthracene) with three different concentrations (10-6molL-1, 10-5molL-1, and 10-4molL-1) were investigated in a pressure range from 0.1MPa to 60MPa at room temperature. According to the EEM, 2 (naphthalene) to 12 (anthracene) fluorescence peaks were observed and the variation of EEM under high pressure were revealed by analyzing the fluorescence peaks positions and intensities with the increased hydrostatic pressure. It is found that fluorescence peak shifts were not detected in the compression, however, both the enhancement of intensity (e.g. naphthalene, 10-6molL-1, peak of 225/330nm, relative fluorescence intensity increased by 0.594) and reduction of intensity (e.g. fluorene, 10-6molL-1, peak of 275/309nm, relative fluorescence intensity decreased by 0.0966) were observed. Otherwise, the pressure effects were magnified when the concentration was increased (e.g. the relative fluorescence intensity of anthracene (peak of 380/425nm) increased by 0.0165 (10-6molL-1) and decreased by 0.479 (10-6molL-1) when the pressure was elevated from 0.1MPa to 60MPa).