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 王月;马壮壮;李营;张飞;陈旭;史志锋(Key Laboratory of Materials Physics of Ministry of Education,School of Physics and Microelectronics,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]Key Laboratory of Materials Physics of Ministry of Education,School of Physics and Microelectronics,Zhengzhou University,Zhengzhou 450001,China

出　　处：《Chinese Physics B》2021年第6期594-601,共8页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 11774318, 12074347, 12004346, and 61935009);the Open Fund of State Key Laboratory of Integrated Optoelectronics (Grant No. IOSKL2020KF04)。

摘　　要：The two-dimensional(2 D) 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-2 D 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-2 D PEA_(2) MA_(n-1) Pbn Br_(3 n+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 photoluminescence(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.

关 键 词：quasi-2D perovskite films vacuum evaporation optical properties STABILITY 

分 类 号：TB383.2[一般工业技术—材料科学与工程] TN312.8[电子电信—物理电子学]