Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 11, Issue 6, Pages 2053-2061Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.0c00330
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Funding
- National Natural Science Foundation of China [21661010]
- Guangxi Natural Science Foundation [2017GXNSFGA198005]
- Open foundation of Guangxi Key Laboratory of Processing for Nonferrous Metals and Featured Materials, Guangxi University [2020GXYSOF07]
- Scientific Research Fund of Hunan Provincial Education Department [18A009]
- Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of Education
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Highly efficient blue-emitting three-dimensional (3D) lead-free halide perovskites with excellent stability have attracted worldwide attention. Herein, a doping route was adopted to incorporate Sb3+ ions into the Cs2NaInCl6 for decorating the electronic band structure. Due to the moderate electron-phonon coupling, the Sb3+-doped Cs2NaInCl6 double perovskites showed a narrow and relatively unusual blue emission of self-trapped excitons (STEs). Density functional theory (DFT) calculation indicated that the doped Sb3+ ions could break the parity-forbidden transition rule and modulate the density of state (DOS) population effectively to boost the PLQY of STEs drastically. The optimized Sb3+:Cs2NaInCl6 exhibited a PLQY of up to 75.89% and excellent stability under the consecutive illumination of 365 nm UV light for 1000 h. This kind of highly efficient lead-free Sb3+-doped Cs2NaInCl6 double perovskites may overcome the bottlenecks of severe toxicity and insufficient stability and therefore have an extensive application in the scarce blue photonic and optoelectronic fields.
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