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

Tianju Zhang; Chaocheng Zhou; Jia Lin; Jun Wang

doi:10.3788/COL202220.021602

Journals >Chinese Optics Letters >Volume 20 >Issue 2 >Page 021602 > Article

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

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

Tianju Zhang^1、2, Chaocheng Zhou^3、4, Jia Lin^3、**, and Jun Wang^{1、2、5、*}

Author Affiliations

¹Laboratory of Micro-Nano Optoelectronic Materials and Devices, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China

²Center of Materials Science and Optoelectronic Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

³Department of Physics, Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power, Shanghai 200090, China

⁴State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China

⁵CAS Center for Excellence in Ultra-Intense Laser Science, Shanghai 201800, China

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DOI: 10.3788/COL202220.021602 Cite this Article Set citation alerts

Tianju Zhang, Chaocheng Zhou, Jia Lin, Jun Wang. Effects on the emission discrepancy between two-dimensional Sn-based and Pb-based perovskites[J]. Chinese Optics Letters, 2022, 20(2): 021602 Copy Citation Text

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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)}_{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.

Keywords

defect state exciton-phonon scattering temperature-dependent photoluminescence spectra transient absorption spectra two-dimensional perovskites

Γ (T) = Γ_{0} + γ_{ac} T + \frac{Γ_{LO}}{e^{E_{LO} / k_{B} T} - 1} + Γ_{imp} e^{- E_{imp} / k_{B} T},

(1)

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Tianju Zhang, Chaocheng Zhou, Jia Lin, Jun Wang. Effects on the emission discrepancy between two-dimensional Sn-based and Pb-based perovskites[J]. Chinese Optics Letters, 2022, 20(2): 021602

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