(Peer-Reviewed) Effects on the emission discrepancy between two-dimensional Sn-based and Pb-based perovskites
Zhang Tianju 张天举 ¹ ², Zhou Chaocheng 周超成 ³ ⁴, Lin Jia 林佳 ³, Wang Jun 王俊 ¹ ² ⁵
¹ Laboratory of Micro-Nano Optoelectronic Materials and Devices, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
中国 上海 中国科学院上海光学精密机械研究所 微纳光电子功能材料实验室
² Center of Materials Science and Optoelectronic Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
中国 北京 中国科学院大学材料科学与光电技术学院
³ Department of Physics, Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power, Shanghai 200090, China
中国 上海 上海市电力材料防护与新材料重点实验室 上海电力大学物理系
⁴ State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
中国 上海 上海交通大学物理与天文学院 区域光纤通信网与新型光通信系统国家重点实验室
⁵ CAS Center for Excellence in Ultra-intense Laser Science, Shanghai 201800, China
中国 上海 中国科学院 超强激光科学卓越创新中心
Two-dimensional (2D) Sn-based perovskites are a kind of non-toxic environment-friendly emission material with low photoluminescence quantum yields (PLQY) and enhanced emission linewidths compared to that of 2D Pb-based perovskites. However, there is no work systematically elucidating the reasons for the differences in the emission properties.
We fabricate (BA)₂SnI₄ and (BA)₂PbI₄ having different defect densities and different exciton-phonon scattering intensities. We also reveal that 2D Sn-based perovskites have stronger exciton-phonon scattering intensity and higher defects density, making significantly broadening the emission linewidth and accelerating the exciton relaxation process, which significantly reduces the PLQY of 2D Sn-based perovskites.