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Investigation of Inhomogeneous Broadening of Optical Spectra of Localized Centers in Solids by Monochromatic-Light-Induced Fluorescence

通过单色光诱导荧光研究固体局域中心光谱的不均匀展宽

基本信息

批准号：
02452039
负责人：
KUSHIDA Takashi
金额：
$ 4.35万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

项目摘要

When the inhomogeneous broadening is significant in the optical spectra, such as in the case or localized electrons in glasses and polymers, it is possible to obtain detailed information only after the elimination of the effect of this inhomogeneous broadening. We have studied a method to eliminate inhomogeneous broadening in optical spectra by observing fluorescence from the sample which is excited by monochromatic light. Especially, it has been aimed to apply this site-selective fluorescence method to dye molecules in condensed matter, in which the discrimination between the scattered exciting light and fluorescence is difficult because of the short fluorescence decay time. We have shown that this is possible by combining ultra-short optical pulses from a cw mode-locked laser and a time-correlated single-photon counting method. In fact, we have succeeded, for the first time, in the d etermination of the site-selected fluorescence spectrum including the narrow resonance line in dye mo … More lecules in polymers and chromophores in proteins. Much information on the homogeneous and inhomogeneous spectra of impurity molecules in disordered systems, such as the site-energy distribution and single-site fluorescence spectra, has been obtained using this method.Detailed analysis of the laser-induced fluorescence experiments in Eu^<3+>-doped materials has also been performed. It has been shown that we can determine various transition mechanisms as well as the distribution of the crystal-field parameters acting on the rare earth ion from the site-selected fluorescence characteristics. It has also been confirmed that all the data including the spectral shape of the laser-induced fluorescence and its dependence on the excitation wave-length are understood consistently by basing on the wave functions of the Eu^<3+> ion. The laser-induced fluorescence spectra in Eu^<3+>-doped glasses and polymers have been compared with the experiments of the applied pressure in Eu^<3+>-doped crystals, and the effectiveness of the site-selective fluorescence method has been established. Less

当不均匀加宽在光谱中是显著的时，例如在玻璃和聚合物中的局域电子的情况下，只有在消除这种不均匀加宽的影响之后才有可能获得详细的信息。本文研究了一种通过观察样品在单色光激发下的荧光来消除光谱不均匀展宽的方法。特别是，它的目的是将这种位点选择性荧光方法应用于凝聚态物质中的染料分子，其中散射激发光和荧光之间的区分是困难的，因为短的荧光衰减时间。我们已经证明，这是可能的结合超短光脉冲从连续锁模激光器和时间相关的单光子计数方法。实际上，我们首次成功地测定了染料分子中包括窄共振线在内的定点荧光光谱， ...更多信息聚合物中的分子和蛋白质中的发色团。利用该方法获得了无序体系中杂质分子的均匀和非均匀光谱信息，如格位能量分布和单格位荧光光谱，并对Eu^（3+）掺杂材料的激光诱导荧光实验进行了详细的分析。结果表明，我们可以确定各种过渡机制，以及晶体场参数的分布作用于稀土离子的选址的荧光特性。同时也证实了，基于Eu^<3+>离子的波函数，我们对激光诱导荧光的光谱形状及其对激发波长的依赖性等所有数据的理解是一致的。将掺Eu ^<3+>玻璃和聚合物中的激光诱导荧光光谱与掺Eu^<3+>晶体中的加压实验进行了比较，证实了择位荧光法的有效性。少