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-bas...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.展开更多
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)。
文摘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.
