Low-dimensional phases engineering for improving the emission efficiency and stability of quasi-2D perovskite films

• 作者: Yue Wang Zhuang-Zhuang Ma Ying Li Fei Zhang Xu Chen Zhi-Feng Shi
• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2021,（6）
• 所属期刊栏目: CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES
• 页码范围: 678-686
• 页数: 9页
• 语种: 英文
• DOI: 10.1088/1674-1056/abe92b

摘要

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.