Temperature-responsive emission and elastic properties of a new 2D lead halide perovskite

• Published in: Dalton transactions : an international journal of inorganic chemistry Vol. 5; no. 7; pp. 2648 - 2653
• Main Authors: Fan, Jia-Hui, Qin, Yan, Azeem, Muhammad, Zhang, Zhuo-Zhen, Li, Zhi-Gang, Sun, Na, Yao, Zhao-Quan, Li, Wei
• Format: Journal Article
• Language: English
• Published: England Royal Society of Chemistry 23.02.2021
• Subjects: Anisotropy; Crystallography; Density functional theory; Elastic properties; Emission spectra; Energy gap; Lead compounds; Metal halides; Optical properties; Optoelectronics; Perovskites; Photoluminescence; Synergistic effect; Temperature dependence; Thermal expansion; Two dimensional materials
• ISSN: 1477-9226; 1477-9234; 1477-9234
• DOI: 10.1039/d0dt04165c

Two-dimensional (2D) organometallic halide perovskites (OHPs) are promising optoelectronic materials because of their excellent stability and tunable band gaps. Herein, we report the optical and elastic properties of a newly synthesized 2D lead halide perovskite, (C 9 H 14 ON) 2 PbI 4 (C 9 H 14 ON + = 4-methoxyphenethylammonium), by a combined experimental and theoretical approach. Our experiments demonstrate that (C 9 H 14 ON) 2 PbI 4 shows a strong green emission under ambient conditions which is ascribed to its band gap of 2.4 eV. Moreover, our temperature-dependent photoluminescence (PL) experiments in the temperature range of 143-283 K reveal that the green emission red-shifts with increasing temperature, which is primarily attributed to the synergistic effect of thermal expansion and electron-phonon interactions. The elastic properties, obtained from density functional theory calculations, reveal that (C 9 H 14 ON) 2 PbI 4 has relatively low modulus and anisotropy compared with other 2D materials. Here, the optical and elastic properties of a newly synthesized 2D lead halide perovskite were systematically investigated via a combined theoretical-experimental approach.