Abstract
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 © 2024 American Chemical Society.
| Original language | English |
|---|---|
| Pages (from-to) | 1484-1490 |
| Number of pages | 7 |
| Journal | ACS Materials Letters |
| Volume | 6 |
| Issue number | 4 |
| Online published | 15 Mar 2024 |
| DOIs | |
| Publication status | Published - 1 Apr 2024 |
Funding
This research was supported by the BrainLink Program (2022H1D3A3A01077343) and the Nano Material Technology Development Program (2021M3H4A1A02057007) funded by the Ministry of Science and ICT through the National Research Foundation of Korea. This research was also supported by the Basic Science Research Program through the NRF funded by the Ministry of Education (2022R1A6A1A03051158, RS-2023-00247069).
