...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Energy Migration and Excimer Formation in Quasi-Two-Dimensional Polymer Films As Revealed by the Time-Resolved Fluorescence Depolarization Measurement
【24h】

Energy Migration and Excimer Formation in Quasi-Two-Dimensional Polymer Films As Revealed by the Time-Resolved Fluorescence Depolarization Measurement

机译：时间分辨荧光去极化测量揭示的准二维聚合物薄膜中的能量迁移和准分子形成

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Excitation energy migration and subsequent energy transfer to excimer-forming sites occurring in a quasi-two-dimensional plane of poly(isobutyl methacrylate) Langmuir-Blodgett films were investigated through the time-resolved analyses of anthracene fluorescence. Fluorescence anisotropy decays showed that the energy migration occurred more efficiently as the anthracene fraction increased. A further increase of the anthracene gave rise to the excimer-forming sites acting as energy traps, and finally the anthracene fluorescence was markedly quenched from the energy transfer to the traps. The migration process was quantitatively analyzed by a computer simulation based on the Monte Carlo method, which allowed estimation of the number of hopping and the mean-square displacement of excitons. The initial growth of the mean-square displacement with time became gradually gentle, while the number of hopping linearly increased with time. This result shows that the excitons are not diffusive and tend to stay within a small cluster of chromophores, especially for small chromophore density at short times.
机译：通过对蒽荧光的时间分辨分析，研究了激发能迁移和随后的能量转移到聚甲基丙烯酸异丁酯Langmuir-Blodgett膜的准二维平面中发生的准分子形成部位。荧光各向异性衰减表明，随着蒽分数的增加，能量迁移更有效地发生。蒽的进一步增加产生了作为能量陷阱的受激准分子形成位点，最后蒽荧光从能量转移到陷阱中被显着淬灭。通过基于蒙特卡洛方法的计算机模拟对迁移过程进行了定量分析，从而可以估算激子的跳跃数和均方位移。均方位移的初始增长随时间逐渐变缓，而跳变次数则随时间线性增加。该结果表明，激子不是扩散性的，而是倾向于留在小的发色团簇内，尤其是对于短时间的小发色团密度。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号