• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The Journal of Chemical Physics >POLING DYNAMICS AND INVESTIGATION INTO THE BEHAVIOR OF TRAPPED CHARGE IN POLED POLYMER FILMS FOR NONLINEAR OPTICAL APPLICATIONS
【24h】

POLING DYNAMICS AND INVESTIGATION INTO THE BEHAVIOR OF TRAPPED CHARGE IN POLED POLYMER FILMS FOR NONLINEAR OPTICAL APPLICATIONS

机译：非线性光学应用的POLED聚合物薄膜的极化动力学及其诱捕行为的研究

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

The behavior of surface and trapped charge that originate during contact electric-field poling of a model guest-host nonlinearly active polymer has been investigated. Charge effects in thin films of pam-nitroaniline doped polymethylmethacrylate were studied during and after the poling process by simultaneous measurement of the current through the poling circuit and the second harmonic generation (SHG) signal from the polymer system. The poling current present in a fresh sample was found to differ in both magnitude and temporal dependence to that observed in the sample during subsequent polings. The magnitude of the steady-state current eventually reached during the poling process was found to depend on temperature and is related to the mobility of charge. A sharp drop-off in SHG signal intensity that occurred when the poling electrodes were grounded is shown to result from the removal of surface charge that orients chromophore dipoles near the surface of the film; the decay in the macroscopic polarization that then occurs is prolonged by charges trapped in the polymer matrix. The build-up of trapped charge explains a memory effect in which the SHG signal relaxation time gradually increased as the film was subjected to multiple polings until a steady-state value was reached. Finally, it is demonstrated that the charges trapped in the polymer matrix are released only after the polymer is heated to high above its temperature of glass transition and the SHG signal has completely decayed away. (C) 1996 American Institute of Physics. [References: 54]
机译：研究了模型客体-主体非线性活性聚合物在接触电场极化过程中产生的表面电荷和捕获电荷的行为。通过同时测量通过极化电路的电流和来自聚合物系统的二次谐波生成（SHG）信号，研究了极化过程中和极化之后，对苯甲基-硝基苯胺掺杂的聚甲基丙烯酸甲酯薄膜的电荷效应。发现存在于新鲜样品中的极化电流在大小和时间依赖性上与随后的极化期间在样品中观察到的电流依赖性不同。发现在极化过程中最终达到的稳态电流的大小取决于温度，并且与电荷的迁移率有关。结果表明，将极化电极接地后，SHG信号强度急剧下降，这是由于去除了使薄膜表面附近的生色团偶极子取向的表面电荷而导致的。捕获在聚合物基质中的电荷会延长随后发生的宏观极化的衰减。俘获电荷的积累解释了一种记忆效应，其中，随着对膜进行多次极化直至达到稳态值，SHG信号的弛豫时间逐渐增加。最后，证明了仅在将聚合物加热到高于其玻璃化转变温度的高温并且SHG信号完全衰减之后，才释放在聚合物基质中捕获的电荷。 （C）1996年美国物理研究所。 [参考：54]

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