Green Light-emitting Diodes Based on Sorbitol-passivated Perovskite Polycrystalline Films

被引：0
作者：
Lu L. [1 ]
Dong J. [1 ]
Chi S. [1 ]
Jin X. [1 ]
Zhao M. [1 ,2 ]
Wang H. [1 ]
Miao Y. [1 ,3 ]
机构：
[1] Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan
[2] Xingxian Economic Development Zone Aluminum Magnesium New Material Research and Development Company Limited, Xingxian
[3] Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering, Taiyuan
来源：
Faguang Xuebao/Chinese Journal of Luminescence | 2023年 / 44卷 / 10期
关键词：
defect passivation; light-emitting diodes; polycrystalline perovskite; sorbitol;
D O I：
10.37188/CJL.20230110
中图分类号：
学科分类号：
摘要：
Metal halide perovskite has excellent photoelectric characteristics such as high defect tolerance， tunable peak position and narrow full width at half maximum， which exhibits great potential in the development of high-performance light-emitting diodes. Perovskite light-emitting diodes can be applied to the large-scale commercial production in the display and lighting fields due to low-cost solution preparation. However， the adverse defects are formed in the process of film formation accompanied by the organic solvent volatilization， which are not conducive to the realization of high performance devices. Introducing additive in perovskite precursor solution is a simple and effective strategy to passivate defects. It is reported that the Lewis base is one of the effective additives. Based on analysis， in this work， we propose to introduce a small molecule Lewis base additive （sorbitol） into the precursor solution to passivate the defects of perovskite film， and fabricate perovskite light-emitting diodes. The experiment results show that the introduction of sorbitol can significantly improve the film quality. And when the concentration of sorbitol is 0.3 mol·L-1， the corresponding device achieves the best electroluminescence performance with the maximum external quantum efficiency and luminance of 6.71% and 7 654 cd·m-2， respectively. In addition， the resulting device also shows good spectral stability and repeatability. This work is of great significance to improve the polycrystalline film forming quality and boosting the performance of perovskite light-emitting diodes. © 2023 Chines Academy of Sciences. All rights reserved.
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页码：1833 / 1841
页数：8
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