乙醇水溶液荧光发射的时域和频域特性研究

针对乙醇水溶液荧光发射的四个特征参量进行了研究,得出了该溶液发射荧光光子的时域和频域特征参量。发射光谱和激发光谱表明乙醇水溶液中含有三个结构不同的发光物质,其发射峰分别位于290 nm,305 nm和330 nm处,与其相对应的最佳吸收峰为265 nm,280 nm和236 nm。荧光强度随溶液中乙醇与水体积混合比的变化规律也证实了三种不同发光结构的存在。在荧光光谱峰值波长处分别监测其荧光强度随时间的衰变过程,将获得的荧光衰减动力学曲线采用指数方法拟合并进行解卷积处理,测试的荧光寿命分别对应8 ns,12 ns,25 ns。结合乙醇水溶液荧光发射的四个特征参量可以看出:乙醇分子和水分子发生团簇作用形成了三个新的分子结构从而可发射具有不同能量的荧光光子。该研究结果能为乙醇水分子的团簇结构研究提供参考。

Frequency-Domain and Time-Domain Characteristic of Fluorescence Spectrum of Ethanol-Water Solution

The) four characteristic parameters of the fluorescence spectrum of ethanol-water solution have been studied.Their time-domain and frequency-domain characteristics have been obtained too.The emission and excitation spectra have indicated that there are three luminescent substances with different molecular structures in the ethanol-water solution.The fluorescence peaks center at 290 nm,305 nm and 330 nm with the corresponding optimal absorptive peaks located at 265 nm,280 nm and 236 nm,respectively.The variation of the fluorescent intensity with the volume fraction of ethanol also attests to the existence of the three different luminescent substances.The decay process of fluorescent intensity is detected at the center of the emission peaks,and it is fitted by an exponential function and the analyzed data are obtained by deconvolution.The fluorescence lifetimes are 8 ns,12 ns,and 25 ns,respectively.From the four fluorescence characteristic parameters of ethanol-water solution,it can be concluded that when ethanol and water molecules are gathered together the clusters with new structures are formed which can emit fluorescence photons with different energy.The research contributes to the study of the molecular structure characteristic of ethanol-water cluster.