4.7 Article

Lead-free rare-earth double perovskite Cs2AgIn1-γ-xBixLaγCl6 nanocrystals with highly efficient warm-white emission

期刊

SCIENCE CHINA-MATERIALS
卷 64, 期 11, 页码 2667-2674

出版社

SCIENCE PRESS
DOI: 10.1007/s40843-021-1681-7

关键词

lead-free; double perovskite; nanocrystal; La3+-Bi3+ co-doping; photoluminescence

资金

  1. National Key Research and Development Program of China [2017YFA0204800]
  2. National Natural Science Foundation of China [21833009, 21533010, 21525315]
  3. Scientific Instrument Developing Project of the Chinese Academy of Sciences [YJKYYQ20190003]
  4. Liaoning Revitalization Talents Program [XLYC1802126]
  5. Dalian City Foundation for Science and Technology Innovation [2019J12GX031]

向作者/读者索取更多资源

This study synthesized Cs2AgIn1-gamma-xBixLa gamma Cl6 NCs to achieve a broadband bright warm-white emission in the visible region with an excellent PL quantum yield of 60%. The research suggests that high-efficiency PL is induced by triplet self-trapping exciton emission, and the incorporation of La3+-Bi3+ facilitates the singlet-triplet transition.
Lead-free double perovskite nanocrystals (NCs), such as Cs2AgInCl6, have attracted considerable attention as stable and non-toxic alternatives to lead-based perovskites. However, the low photoluminescence (PL) intensity of pristine Cs2AgInCl6 limits its practical applications. In this study, a series of Cs2AgIn1-gamma-xBixLa gamma Cl6 NCs were synthesized to break the parity-forbidden transition and modify the associated optical functionalities. A broadband bright warm-white emission in the visible region was achieved, with an excellent PL quantum yield of 60%. The dynamic mechanism, involving ultrafast transient absorption, suggests that high-efficiency PL is induced by triplet self-trapping exciton emission. The incorporation of La3+-Bi3+ facilitated the singlet-triplet transition by increasing the lifetime and quickening the intersystem crossing process. This finding provides a reliable method for optimizing the optical properties of emerging lead-free halide perovskite NCs.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据