REABSORPTION AND HIGH-DENSITY EXCITATION EFFECTS ON TIME-RESOLVED FLUORESCENCE-SPECTRA OF ANTHRACENE CRYSTAL
REABSORPTION AND HIGH-DENSITY EXCITATION EFFECTS ON TIME-RESOLVED FLUORESCENCE-SPECTRA OF ANTHRACENE CRYSTAL
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DOI：
10.1080/15421407408084821
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发表时间：
1974-01-01
影响因子：
0.7
通讯作者：
NAGAKURA, S
中科院分区：
文献类型：
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作者：
KOBAYASHI, T;NAGAKURA, S
测量了纯蒽晶体的荧光寿命的光谱依赖性以及高密度和低密度激发下的时间分辨荧光光谱。使用氮气激光器作为激发源。发现低密度激发的荧光寿命在较短波长区域中比在较长波长区域中更短，并且在整个波长区域上，厚晶体比薄晶体或粉末长。这可以通过重吸收效应来解释。此外，发现由于高密度激发而导致的荧光强度增量在较短波长区域中比在较长波长区域中更显着。这种高密度激发效应是根据基态耗尽引起的重吸收减少来讨论的。
The spectral dependence of fluorescence lifetime and the time-resolved fluorescence spectra at high and low density excitations were measured for pure anthracene crystals. A nitrogen gas laser was used as excitation source. The fluorescence lifetime with low density excitation was found to be shorter in the shorter wavelength region than in the longer wavelength region and to be longer over whole wavelength region for the thick crystal than for the thin crystals or powders. This can be explained by the reabsorption effect. Furthermore, a fluorescence intensity increment due to high density excitation was found to be more predominant in the shorter wavelength region than in the longer wavelength region. This high density excitation effect is discussed in terms of decreasing reabsorption caused by the ground state depletion.