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Anomalous behaviour of emission anisotropy for short living derivatives of stilbene

机译：二苯乙烯的短寿命衍生物的发射各向异性的异常行为

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Stilbene and its derivatives are often used as fluorescent probes to study photophysical properties of different media. These compounds are characterized by a high quantum yield and a very short mean excited state lifetimes what allows studying changes of emission anisotropy r as a function of both excitation and observation wavelength. In this Letter absorption, fluorescence as well as polarization excitation and emission spectra are presented for stilbenes in solvents of different viscosity and polarity. Higher emission anisotropy values in the absorption band are observed which stay at the same level upon excitations different than those corresponding to the 0-0 transition wavelength. It can be explained by the presence of two luminescent centers contributing to emitted light or by incomplete relaxation of the excited states before emission. (C) 2003 Elsevier Science B.V. All rights reserved. [References: 25]
机译：二苯乙烯及其衍生物经常被用作荧光探针来研究不同介质的光物理性质。这些化合物的特征在于高量子产率和非常短的平均激发态寿命，这使得可以研究发射各向异性r随激发波长和观察波长的变化。在这封信中，介绍了在不同粘度和极性的溶剂中对苯二甲酸酯的荧光以及偏振激发和发射光谱。在吸收带中观察到较高的发射各向异性值，在与对应于0-0跃迁波长的激发不同的激发下，它们保持在同一水平。可以通过存在两个有助于发射光的发光中心或发射前激发态的不完全松弛来解释。 （C）2003 Elsevier Science B.V.保留所有权利。 [参考：25]

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