Air-stable and low threshold amplified spontaneous emission via CsBr aqueous solution processed all-inorganic CsPbBr3 perovskite films

Inorganic cesium lead halide perovskite (CsPbX3, X = Cl, Br, and I) has attracted increasing attention in the field of laser application due to its excellent stability compared to the organic–inorganic hybrid perovskite since affording the radiation of a long pulse pump source requires high thermal...

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Bibliographic Details
Published in:Applied physics letters 2021-06, Vol.118 (25)
Main Authors: Liu, Ruqing, Chen, Wei, Liu, Li, Lu, Yannan, Li, Weili, Fu, Tiliang, Liu, Xiang, Hang, Xiao-Chun, Sun, Zhengyi
Format: Article
Language:English
Subjects:
Amplification
Applied physics
Aqueous solutions
Cesium bromides
Laser applications
Lead compounds
Metal halides
Optical properties
Perovskites
Photoluminescence
Spontaneous emission
Thermal stability
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Summary:Inorganic cesium lead halide perovskite (CsPbX3, X = Cl, Br, and I) has attracted increasing attention in the field of laser application due to its excellent stability compared to the organic–inorganic hybrid perovskite since affording the radiation of a long pulse pump source requires high thermal stability of the material. However, it is difficult to observe the amplified spontaneous emission (ASE) of CsPbBr3 using a one-step solution method due to the low solubility of CsBr in the organic solvent. Herein, we fabricate a CsPbBr3 film with a two-step solution method and realize the ASE under the long pulse pumping. Meanwhile, a CsBr aqueous solution is used as an effective additive to increase the concentration of Cs+ in the precursor solution and then to improve the optical amplification properties of the CsPbBr3 films. The films exhibit better crystalline and enhanced photoluminescence intensity. Both the ASE threshold and gain have been significantly improved. Furthermore, the optimized film shows a satisfying stability of ASE after being placed in the air for more than two months.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0056102