【摘 要】
：
The two-dimensional (2D) Ruddlesden-Popper-type perovskites,possessing tunable bandgap,narrow light emission,strong quantum confinement effect,as well as a simp
【机 构】
：
Key Laboratory of Materials Physics of Ministry of Education,School of Physics and Microelectronics,
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The two-dimensional (2D) Ruddlesden-Popper-type perovskites,possessing tunable bandgap,narrow light emission,strong quantum confinement effect,as well as a simple preparation method,are identified as a new generation of candidate materials for efficient light-emitting diodes.However,the preparation of high-quality quasi-2D perovskite films is still a challenge currently,such as the severe mixing of phases and a high density of defects within the films,impeding the further promotion of device performance.Here,we prepared the quasi-2D PEA2MAn-1PbnBr3n+1 perovskite films by a modified spin-coating method,and the phases with large bandgap were effectively suppressed by the vacuum evaporation treatment.We systematically investigated the optical properties and stability of the optimized films,and the photolumines-cence (PL) quantum yield of the treated films was enhanced from 23％ to 45％.We also studied the emission mechanisms by temperature-dependent PL spectra.Moreover,the stability of films against moisture,ultraviolet light,and heat was also greatly improved.
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