Ren Zhilin, Yuan Zhengtian, Sergeev Aleksandr A, Lončarić Ivor, Ali Muhammad Umair, Rehman Atta Ur, Wong Kam Sing, He Yanling, Ovčar Juraj, Popović Jasminka, Djurišić Aleksandra B
Department of Physics, The University of Hong Kong, Pokfulam Road, Hong Kong.
Department of Physics, William Mong Institute of Nano Science and Technology, The Hong Kong University of Science and Technology, Clearwater Bay, Hong Kong.
Molecules. 2025 Jun 24;30(13):2716. doi: 10.3390/molecules30132716.
Two-dimensional lead halide perovskites are of significant interest for a variety of practical applications. However, the relationships between their composition and properties are not fully clear. Here we investigated photoluminescence from 2D Ruddlesden-Popper perovskites with different bulky spacer cations. Significant differences in their optical properties and stability are observed, and perovskites with benzylammonium (BZA) and phenethylammonium (PEA) were selected for more detailed investigation of the observed stability differences due to their similar structure. We find that PEAPbI exhibits more narrow emission and increased stability compared to BZAPbI. In addition, PEAPbI exhibits self-healing of defects evident from PL enhancement, which is absent for BZAPbI. The observed differences between perovskites with BZA and PEA spacer cations can be attributed to differences in the formation of spacer cation vacancies.
二维卤化铅钙钛矿因其各种实际应用而备受关注。然而，它们的组成与性质之间的关系尚未完全明确。在此，我们研究了具有不同大体积间隔阳离子的二维Ruddlesden-Popper钙钛矿的光致发光。观察到它们的光学性质和稳定性存在显著差异，由于苄基铵（BZA）和苯乙铵（PEA）的结构相似，因此选择含有这两种离子的钙钛矿对观察到的稳定性差异进行更详细的研究。我们发现，与BZAPbI相比，PEAPbI表现出更窄的发射和更高的稳定性。此外，PEAPbI表现出明显的缺陷自修复，这从光致发光增强中可以看出，而BZAPbI则没有。观察到的含有BZA和PEA间隔阳离子的钙钛矿之间的差异可归因于间隔阳离子空位形成的差异。
