TY - JOUR
T1 - Enhancing Energy Transfer through Structure Reconstruction of Quasi-2D Perovskites for Highly Efficient Light-Emitting Diodes
AU - Li, Fuqiang
AU - Li, Ying
AU - Yu, Zhongkai
AU - Du, Xiangrui
AU - Yang, Eunhye
AU - Ahn, Yoomi
AU - Huang, Xiaofeng
AU - Lee, Bo Ram
AU - Park, Sung Heum
N1 - Publisher Copyright:
© 2024 American Chemical Society.
PY - 2024/4/1
Y1 - 2024/4/1
N2 - 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
AB - 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
UR - https://www.scopus.com/pages/publications/85188174061
U2 - 10.1021/acsmaterialslett.4c00171
DO - 10.1021/acsmaterialslett.4c00171
M3 - Article
AN - SCOPUS:85188174061
SN - 2639-4979
VL - 6
SP - 1484
EP - 1490
JO - ACS Materials Letters
JF - ACS Materials Letters
IS - 4
ER -
