Revealing the origin of excimer emission in anthracene crystals: The role of excitation wavelength and pressure

被引：6

作者：

Tang, Cheng ^{[1
]}

Zhu, Xiaojun ^{[1
]}

Song, Yunfei ^{[2
]}

Liu, Weilong ^{[1
]}

Yang, Qingxin ^{[1
]}

Lv, Zhe ^{[1
]}

Yang, Yanqiang ^{[1
,2
]}

机构：

[1] Harbin Inst Technol, Dept Phys, Harbin 150001, Heilongjiang, Peoples R China

[2] China Acad Engn Phys, Inst Fluid Phys, Natl Key Lab Shock Wave & Detonat Phys, Mianyang 622900, Peoples R China

来源：

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY | 2019年 / 376卷

基金：

中国国家自然科学基金;

关键词：

Excimer emission; Excitation wavelength; High pressure; vdW dimer; DEFECT FLUORESCENCE; PHOTODIMERIZATION; SPECTRA; SPECTROSCOPY;

D O I：

10.1016/j.jphotochem.2019.03.024

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Understanding the formation mechanism of excimer emission in aromatic molecules is the fundamental to several areas of photochemistry, including photo-induced dimerization. In this study, we observed the formation process of excimer emission in anthracene crystals at normal pressure by varying excitation wavelength. It was found that the excimer emission in anthracene crystals was originated from photo-induced van der Waals (vdW) dimers of anthracene molecules. The formation and annihilation processes of the excimer emission were characterized during the pressure loading and unloading processes, which were assigned to the pressure-induced vdW dimers formation and annihilation. Note that the fluorescence spectrum of anthracene crystals was dominated by excimer emission at 5.88 GPa, the excitation wavelength dependence of excimer emission can be obtained. The observed frequency shift confirmed the role of excitation wavelength in fluorescence process. These findings have significant implications for understanding the origin of the excimer emission and open novel perspectives in the fluorescence research of aromatic molecules.

引用

页码：263 / 268

页数：6

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