Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (11): 20220418.doi: 10.7503/cjcu20220418

• Article: Inorganic Chemistry • Previous Articles     Next Articles

Synthesis and Optical Properties of RbPb2Cl5

ZHANG Zhinan1, CHENG Haiming1, TENG Shiyong2, ZHANG Ying1()   

  1. 1.College of Chemistry,Jilin University,Changchun 130012,China
    2.First Hospital,Jilin University,Changchun 130021,China
  • Received:2022-06-13 Online:2022-11-10 Published:2022-08-15
  • Contact: ZHANG Ying E-mail:Zhang_ying_2009@jlu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(51872114)

Abstract:

Lead-based perovskites have been extensively studied due to their excellent optoelectronic properties. Compared to the typical CsPbX3 material, the study of RbPb2X5 perovskites material is relatively backward. In this paper, the effect of different ball milling times on the formation of RbPb2Cl5 crystals was investigated by controlling the molar ratio of reaction precursors using a mechanical grinding method. The X-ray diffraction result showed that the pure phase RbPb2Cl5 crystal powder could be prepared after 1 h of grinding, and its structure was attributed to the monoclinic crystal system with [Pb-Cl7] decahedra connected by edge-sharing phases, and the P21/C space point group. The RbPb2Cl5 crystals show significant absorption in the UV region with a band edge absorption value of 3.82 eV. Under photoexcitation conditions, the crystals display excitation wavelength dependent dual wavelength fluorescence of yellow-green light at 540 nm and orange light at 635 nm. The study of the variable temperature spectra, time-resolved spectra and the linear dependence of the intensity of the emission peaks on the energy density suggests that the luminescence mechanism should be attributed to the fact that the material has two different self-trapped excitonic states, resulting in a dual-channel emission dependent on the excitation wavelength.

Key words: 3D RbPb2Cl5, Mechanical grinding synthesis, Excitation wavelength dependent emission

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