Efficient Quasi-Two-Dimensional Perovskite Light-Emitting Diodes with Improved Multiple Quantum Well Structure

• DOI: 10.1021/acsami.9b10186
• Publication Date: 2019-12-27T14:23:26Z
• Authors: Wentao Bi; Qiuhong Cui; Pengcheng Jia; Xin Huang; Yangguang Zhong; Dongdong Wu; Yang Tang; Shuang Shen; Yufeng Hu; Zhidong Lou; Feng Teng; Xinfeng Liu; Yanbing Hou
• Keywords: 01 natural sciences; 7. Clean energy; 0104 chemical sciences

Quasi-two-dimensional (quasi-2D) perovskites with a multiple quantum well structure can enhance the exciton binding energy and controllable quantum confine effect, which are attractive materials for efficient perovskite light-emitting diodes (PeLEDs). However, the multiphase mixtures contained in these materials would cause nonradiative recombination at the perovskite film surface. Here, a facile solution surface treatment is adopted to improve the multiple quantum well structure of the quasi-2D perovskite emitting layer, which can reduce the influence of defectinduced nonradiative recombination and the electric-field-induced dissociation of excitons for the PeLEDs. The improved multiple quantum well structure is verified by UV absorption spectra and temperature-dependent photoluminescence spectra measurements. The photoluminescence quantum yield of the quasi-2D perovskite film with surface treatment has been approximately increased by 200%. Meanwhile, the electroluminescence device achieves a current efficiency of 45.9 cd/A.