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  • Chinese Optics Letters
  • Vol. 20,
  • Issue 2,
  • pp. 021602-
  • (2022)

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

Tianju Zhang, Chaocheng Zhou, Jia Lin, and Jun Wang

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Abstract

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)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, significantly broadening the emission linewidth and accelerating the exciton relaxation process, which significantly reduces the PLQY of 2D Sn-based perovskites.

© 2022 Chinese Laser Press

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