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