PubCard - Effects on the emission discrepancy between two-dimensional Sn-based and Pb-based perovskites

(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

Chinese Optics Letters, 2021-11-11

http://www.opticsjournal.net/Articles/HPAbstractM?manu_number=COL-21-0614

Abstract

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.