Fluorescence response of mineral oils: spectral yield vs absorption and decay time.
Fluorescence response of mineral oils: spectral yield vs absorption and decay time.
复制标题
矿物油的荧光响应：光谱产率与吸收和衰减时间。
DOI：
10.1364/ao.30.000026
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发表时间：
1991
期刊：
影响因子：
1.9
通讯作者：
G. Rossi
中科院分区：
文献类型：
--
作者：
P. Camagni;A. Colombo;C. Koechler;N. Omenetto;P. Qi;G. Rossi
通过两个独立的实验研究了来自代表性油的膜样品的荧光发射：（i）在固定激发频率下的时间分辨荧光感测，通过该荧光感测，确定光谱发射产率和相关的衰减时间τ（λ），以及（ii）监测作为膜厚度的函数的固定光谱带中的积分荧光，从该消光系数α（λ）导出多个激发频率下的消光系数。在检查了两类实验中获得的相应发射数据的良好相互一致性之后，根据重整化转换效率，即，- 针对比率（τ/α）校正所测量的光谱产额。这个量可以通过适当的模型显示为典型的发射荧光团，但独立于由于复杂的油介质的吸收或猝灭效应。对许多种类的油类来说，情况确实如此，尽管它们的绝对排放量有极大的差异。
The fluorescent emission from film samples of representative oils has been investigated by means of two independent experiments: (i) time-resolved fluorosensing at a fixed excitation frequency, by which the spectral emission yield and the associated decay times, tau(lambda), were determined, and (ii) monitoring of the integrated fluorescence in a fixed spectral band as a function of film thickness, from which extinction coefficients alpha(lambda) were derived at a number of excitation frequencies. After checking the good mutual consistency of corresponding emission data obtained in the two types of experiments, a unified analysis was elaborated in terms of a renormalized conversion efficiency, i.e., correcting the measured spectral yields for the ratio (tau/alpha). This quantity can be shown by an ppropriate model to be typical of the emitting fluorophores but independent of absorption or quenching effects due to the complex oil medium. This was indeed found to be the case for a large variety of oils, in spite of extreme variations in their absolute emission yield.