• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Symposium on Quantum Confined Semiconductor Nanostructures Dec 2-5, 2002 Boston, Massachusetts, U.S.A. >Resonant photoluminescence and excitation spectroscopy of CdSe/ZnSe and CdTe/ZnTe self-assembled quantum dots
【24h】

Resonant photoluminescence and excitation spectroscopy of CdSe/ZnSe and CdTe/ZnTe self-assembled quantum dots

机译：CdSe / ZnSe和CdTe / ZnTe自组装量子点的共振光致发光和激发光谱

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

We show that two major carrier excitation mechanisms are present in Ⅱ-VI self-assembled quantum dots. The first one is related to direct excited state - ground state transition. It manifests itself by the presence of sharp and intense lines in the excitation spectrum measured from single quantum dots. Apart from these lines, we also observe up to four much broader excitation lines. The energy spacing between these lines indicates that they are associated with absorption related to longitudinal optical phonons. By analyzing resonantly excited photoluminescence spectra, we are able to separate the contributions from these two mechanisms. In the case of CdTe dots, the excited state - ground state relaxation is important for all dots in ensemble, while phonon-assisted processes are dominant for the dots with smaller lateral size.
机译：我们证明了在Ⅱ-Ⅵ自组装量子点中存在两种主要的载流子激发机制。第一个与直接激发态-基态跃迁有关。它通过从单个量子点测得的激发光谱中存在锐利而强烈的线来表现出来。除了这些线，我们还观察到多达四个更宽的激励线。这些线之间的能量间隔表明它们与与纵向光学声子有关的吸收有关。通过分析共振激发的光致发光光谱，我们能够从这两种机制中分离出贡献。在CdTe点的情况下，激发态-基态弛豫对于整体中的所有点都很重要，而声子辅助过程对于横向尺寸较小的点来说是主要的。

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