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. 2022 Oct 31;7(12):4232–4241. doi: 10.1021/acsenergylett.2c02123

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© 2022 The Authors. Published by American Chemical Society

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Photoluminescence spectra of the studied compounds under different conditions (excitation at 4.6 eV for PEA₂PbCl₄; 3.1 eV for the others). (a) Room-temperature spectra in the visible range on a linear scale. Semilogarithmic spectra of PEA₂PbI₄ (b) and PEA₂PbBr₄ (c) upon temperature variation. The black arrows indicate the peak energy of the emerging broad emission bands. (d) Comparison of PEA₂PbBr₄, PEA₂PbI₄, and PEA₂SnI₄ PL at 5.4 K indicating the pronounced red-shifted BE in all cases. (e) PL of PEA₂SnI₄ in the near-infrared spectral region upon temperature variation. The arrow identifies an additional BE at 0.9 eV.