ABSTRACT Lead halide perovskite has attracted extensive attention in the field of photoelectric conversion and detection due to its excellent photoelectric properties. However, the toxicity of lead and environmental pollution will affect the practical application. By substituting Cu + for Pb 2+ and MA + for Cs + , a new organic–inorganic hybrid copper (I) halide MACu 2 I 3 single crystal with 1D structure was successfully prepared by slow evaporation of solvent. The results show that the crystal belongs to the monoclinic system (P2 1 /m), and the MACu 2 I 3 single crystal is a direct band gap material with a direct band gap of 2.09 eV. The photoluminescence spectrum shows that the excitation peak of the MACu 2 I 3 crystal is 330 nm, and the emission peaks are 415 and 610 nm, respectively, with the corresponding fluorescence decay times being 0.21 and 329 ns, indicating that the MACu 2 I 3 single crystal exhibits ultrafast luminescence decay behavior. Therefore, this work highlights the potential of the MACu 2 I 3 single crystal in the field of ultrafast optics.
Zou et al. (Wed,) studied this question.
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