標題: | Structure-Dependent Photoluminescence in Low-Dimensional Ethylammonium, Propylammonium, and Butylammonium Lead Iodide Perovskites |
作者: | Lin, Chang-Wei Liu, Fangzhou Chen, Ting-Yang Lee, Kuan-Hua Chang, Chung-Kai He, Yanling Leung, Tik Lun Ng, Alan Man Ching Hsu, Chia-Hung Popovic, Jasminka Djurisic, Aleksandra Ahn, Hyeyoung 交大名義發表 National Chiao Tung University |
關鍵字: | two-dimensional materials;hybrid lead halide perovskites;alkylammonium;excitonic emission;broadband emission |
公開日期: | 29-一月-2020 |
摘要: | Hybrid organic-inorganic perovskites have attracted great attention as the next generation materials for photovoltaic and light-emitting devices. However, their environment instability issue remains as the largest challenge for practical applications. Recently emerging two-dimensional (2D) perovskites with Ruddlesden-Popper structures are found to greatly improve the stability and aging problems. Furthermore, strong confinement of excitons in these natural quantum-well structures results in the distinct and narrow light emission in the visible spectral range, enabling the development of spectrally tunable light sources. Besides the strong quasi-monochromatic emission, some 2D perovskites composed of the specific organic cations and inorganic layer structures emit a pronounced broadband emission. Herein, we report the light-emitting properties and the degradation of low-dimensional perovskites consisting of the three shortest alkylammonium spacers, mono-ethylammonium (EA), n-propylammonium (PA), and n-butylammonium (BA). While (BA)(2)PbI4 is known to form well-oriented 2D thin films consisting of layers of corner-sharing PbI6 octahedra separated by a bilayer of BA cations, EA with shorter alkyl chains tends to form other types of lower-dimensional structures. Nevertheless, optical absorption edges of asprepared fresh EAPbI(3), (PA)(2)PbI4, and (BA)(2)PbI4 are obviously blue-shifted to 2.4-2.5 eV compared to their 3D counterpart, methylammonium lead iodide (MAPbI(3)) perovskite, and they all emit narrow excitonic photoluminescence. Furthermore, by carefully optimizing deposition conditions, we have achieved a predominantly 2D structure for (PA)(2)PbI4. However, unlike (BA)(2)PbI4, upon exposure to ambient environment, (PA)(2)PbI4 readily transforms to a different crystal structure, exhibiting a prominently broadband light from similar to 500 to 800 nm and a gradual increase in intensity as structural transformation proceeds. |
URI: | http://dx.doi.org/10.1021/acsami.9b17881 http://hdl.handle.net/11536/153805 |
ISSN: | 1944-8244 |
DOI: | 10.1021/acsami.9b17881 |
期刊: | ACS APPLIED MATERIALS & INTERFACES |
Volume: | 12 |
Issue: | 4 |
起始頁: | 5008 |
結束頁: | 5016 |
顯示於類別: | 期刊論文 |