• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nanotechnology >Facile, one-pot and scalable synthesis of highly emissive aqueous-based Ag,Ni: ZnCdS/ZnS core/shell quantum dots with high chemical and optical stability
【24h】

Facile, one-pot and scalable synthesis of highly emissive aqueous-based Ag,Ni: ZnCdS/ZnS core/shell quantum dots with high chemical and optical stability

机译：具有高化学和光学稳定性的高度发光性水基AG，Ni：ZnCds / ZnS核心/壳量子点的便利，单罐和可扩展合成，具有高化学和光学稳定性

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 report here on a one-pot, mild and low cost aqueous-based synthetic route for the preparation of colloidally stable and highly luminescent dual-doped Ag,Ni: ZnCdS/ZnS core/shell quantum dots (QDs). The pure dopant emission of the Ni-doped core/shell QDs was found to be highly affected by the presence of a second dopant ion (Ag+). Results showed that the PL emission intensity increases while its peak position experiences an obvious blue shift with an increase in the content of Ag+ ions. Regarding the optical observations, we provide a simple scheme for absorption-recombination processes of the carriers through impurity centers. To obtain optimum conditions with a better emission characteristic, we also study the effect of different reaction parameters, such as refluxing temperature, the pH of the core and shell solution, molar ratio of the dopant ions (Ni:(Zn+Cd) and Ag:(Zn+Cd)), and concentration of the core and shell precursors. Nonetheless, the most effective parameter is the presence of the ZnS shell in a suitable amount to eliminate surface trap states and enhance their emission intensity. It can also improve the bio-compatibility of the prepared QDs by restricting the Cd2+ toxic ions inside the core of the QDs. The present suggested route also revealed the remarkable optical and chemical stability of the colloidal QDs which establishes them as a decent kind of nano-scale structure for light emitting applications, especially in biological technologies. The suggested process also has the potential to be scaled-up while maintaining the emission characteristics and structural quality necessary for industrial applications in optoelectronic devices.
机译：我们在此报告在这里的一锅，温和和低成本的基于水性合成途径，用于制备胶体稳定且高度发光的双掺杂Ag，Ni：ZnCds / ZnS核/壳量子点（QDS）。发现Ni掺杂核/壳QD的纯掺杂剂排放受到第二掺杂剂离子（Ag +）的存在。结果表明，PL发射强度增加，而其峰值位置经历明显的蓝色转变，其含量明显是Ag +离子的含量。关于光学观察，我们通过杂质中心提供了一种用于载体的吸收重组过程的简单方案。为了获得更好的发射特性的最佳条件，我们还研究了不同反应参数的影响，例如回流温度，核心和壳溶液的pH，掺杂剂离子的摩尔比（Ni：（Zn + Cd）和Ag ：（Zn + CD）），浓度和壳体前体的浓度。尽管如此，最有效的参数是在适当的量中存在ZnS外壳，以消除表面捕集状态并增强它们的发光强度。它还可以通过限制QDS内核内的CD2 +毒性离子来改善制备的QD的生物兼容性。本提出的途径还揭示了胶体QD的显着光学和化学稳定性，其将它们建立为发光应用的一种体面的纳米级结构，特别是在生物技术中。建议的过程还具有待扩大措施，同时保持了光电器件中工业应用所需的发射特性和结构质量。

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