摘要
Two-dimensional (2D) Sn-based perovskites are a kind of non-toxic environment-friendly emission material with low photoluminescence quantum yields (PLQYs) 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)_(2)SnI_(4)and (BA)_(2)PbI_(4)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,significantly broadening the emission linewidth and accelerating the exciton relaxation process,which significantly reduces the PLQY of 2D Sn-based perovskites.
作者
Tianju Zhang
Chaocheng Zhou
Jia Lin
Jun Wang
张天举;周超成;林佳;王俊(Laboratory of Micro-Nano Optoelectronic Materials and Devices,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;Center of Materials Science and Optoelectronic Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;Department of Physics,Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power,Shanghai University of Electric Power,Shanghai 200090,China;State Key Laboratory of Advanced Optical Communication Systems and Networks,School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China;CAS Center for Excellence in Ultra-Intense Laser Science,Shanghai 201800,China)
基金
The work was supported by the National Natural Science Foundation of China(NSFC)(Nos.61975221,12174246,and 61875119)
Strategic Priority Research Program of CAS(No.XDB16030700)
Shanghai Science and Technology International Cooperation Fund(No.19520710200)。
