高等学校化学学报 ›› 2022, Vol. 43 ›› Issue (11): 20220418.doi: 10.7503/cjcu20220418

• 研究论文: 无机化学 • 上一篇    下一篇

RbPb2Cl5的合成及光学性质

张志男1, 程海明1, 滕士勇2, 张颖1()   

  1. 1.吉林大学化学学院, 长春 130012
    2.吉林大学第一医院, 长春 130021
  • 收稿日期:2022-06-13 出版日期:2022-11-10 发布日期:2022-08-15
  • 通讯作者: 张颖 E-mail:Zhang_ying_2009@jlu.edu.cn
  • 基金资助:
    国家自然科学基金(51872114)

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)

摘要:

采用机械研磨的方法, 通过控制反应前驱体的摩尔比, 研究了不同球磨时间对形成RbPb2Cl5晶体的影响. X射线衍射结果表明, 经过1 h的研磨可制备纯相RbPb2Cl5晶体粉末, 其结构为通过边共享相连接的 [Pb-Cl7]十面体, 归属于单斜晶系P21/c空间点群. RbPb2Cl5晶体在紫外区有明显的吸收, 其带边吸收值为 3.82 eV. 在光激发条件下, 该晶体显示激发波长依赖的540 nm黄绿光和635 nm橙光的双波长荧光. 变温光谱、 时间分辨光谱和发射峰强度与能量密度依赖的线性关系研究表明, 其发光机制应该归结于材料具有两种不同的自陷激子态, 从而产生了与激发波长相关的双通道发射.

关键词: 三维RbPb2Cl5, 机械研磨合成, 激发波长相关发射

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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