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- Title
异价阳离子替代实现的金属卤化物 CsCdCl<sub>3</sub> 的 明亮宽带绿色发光.
- Authors
宋 妍; 王 录; 陈明星; 魏荣敏; 李新慧; 贾 贞; 夏明军
- Abstract
All-inorganic metal halides have shown significant applications in solid-state optoelectronics because of their flexible structures and impressive fluorescence emissions. In this study, a heterovalent cation substitution strategy was used to partially replace the divalent cadmium ions in CsCdCl3 with trivalent antimony ions to promote the production of self-trapped excitons, resulting in a bright broadband green photoluminescence of CsCdCl3∶ Sb3+ with a central wavelength of 530 nm. Mechanism researches results show that the adjacent SbCl6 octahedra in CsCdCl3∶ Sb3+ are isolated, forming a low-dimensional electronic configuration that promotes Sb3+ localization and achieves efficient photoluminescence with a quantum efficiency of up to 95. 5% . Furthermore, although both CsCdCl3 and RbCdCl3 belong to ACdCl3 ( A is an alkali metal family), they have distinctly different crystal structures. RbCdCl3 crystallizes in the orthorhombic crystal system with space group of Pnma; while CsCdCl3 crystallizes in the hexagonal phase crystal system with space group of P63/ mmc. The structural symmetry of CsCdCl3 is higher than that of RbCdCl3, indicating that its crystal structure is less distorted away from the cubic phase than that of RbCdCl3, resulting in a smaller Stokes shift and corresponding blue shift of the emission spectrum in CsCdCl3∶ Sb3+ than in RbCdCl3∶ Sb3+. This work not only provides a method for designing new photoluminescence materials by heterovalent cation substitution but also paves an avenue for modulating the luminescent properties of metal halides through crystal structure symmetry.
- Subjects
ORTHORHOMBIC crystal system; HEXAGONAL crystal system; STOKES shift; CRYSTAL symmetry; ELECTRON configuration
- Publication
Journal of Synthetic Crystals, 2023, Vol 52, Issue 2, p307
- ISSN
1000-985X
- Publication type
Article