二极管
光电子学
材料科学
发光二极管
能量转移
工程物理
能量(信号处理)
物理
量子力学
作者
Fuqiang Li,Ying Liu,Zhongkai Yu,Xiaozhang Du,Eunhye Yang,Yoomi Ahn,Xiwei Huang,Bo Ram Lee,Sung Heum Park
出处
期刊:ACS materials letters
[American Chemical Society]
日期:2024-03-15
卷期号:: 1484-1490
标识
DOI:10.1021/acsmaterialslett.4c00171
摘要
Quasi-two-dimensional (quasi-2D) Ruddlesden–Popper (RP) perovskites, exemplified by BA2Csn–1PbnBr3n+1 (BA = butylammonium, n > 1), show promise as efficient emitters. However, their electroluminescence performance is limited by a significant energy loss during carrier transportation. Herein we use 2-methylthiophene-3-carboxylic acid (MeTCA), which forms robust hydrogen-bonding interactions with the spacer BA cations, to reconstruct the quasi-2D perovskite structure. This reconstruction enhances the energy transfer in perovskite films, thereby improving the light emission efficiency. Additionally, MeTCA reduces the defect density in RP perovskites by acting as an electron-rich Lewis base and eliminating uncoordinated Pb2+. Consequently, we achieve a photoluminescence quantum yield of up to 83.22% for the quasi-2D perovskite prepared by using the MeTCA additive strategy. Furthermore, we successfully fabricate high-efficiency quasi-2D perovskite light-emitting diodes with a maximum external quantum efficiency of 21.73% and a current efficiency of 70.30 cd A–1.
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