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Light emission from multiple self-trapped excitons in one-dimensional Ag-based ternary halides |
| Jiahao Xie(颉家豪)†, Zewei Li(李泽唯)†, Shengqiao Wang(王晟侨), and Lijun Zhang(张立军)‡ |
| State Key Laboratory of Integrated Optoelectronics, Key Laboratory of Automobile Materials of MOE, Key Laboratory of Material Simulation Methods & Software of MOE, School of Materials Science and Engineering, Jilin University, Changchun 130000, China |
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Abstract Ternary metal halides based on Cu(I) and Ag(I) have attracted intensive attention in optoelectronic applications due to their excellent luminescent properties, low toxicity, and robust stability. While the self-trapped excitons (STEs) emission mechanisms of Cu(I) halides are well understood, the STEs in Ag(I) halides remain less thoroughly explored. This study explores the STE emission efficiency within the $A_{2}$Ag$X_{3}$ ($A = {\rm Rb}$, Cs; $X = {\rm Cl}$, Br, I) system by identifying three distinct STE states in each material and calculating their configuration coordinate diagrams. We find that the STE emission efficiency in this system is mainly determined by STE stability and influenced by self-trapping and quenching barriers. Moreover, we investigate the impact of structural compactness on emission efficiency and find that the excessive electron-phonon coupling in this system can be reduced by increasing the structural compactness. The atomic packing factor is identified as a low-cost and effective descriptor for predicting STE emission efficiency in both Cs$_{2}$Ag$X_{3}$ and Rb$_{2}$Ag$X_{3}$ systems. These findings can deepen our understanding of STE behavior in metal halide materials and offer valuable insights for the design of efficient STE luminescent materials. The datasets presented in this paper are openly available in Science Data Bank at https://doi.org/10.57760/sciencedb.12094.
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Received: 17 August 2024
Revised: 07 September 2024
Accepted manuscript online: 24 September 2024
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PACS:
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71.38.Ht
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(Self-trapped or small polarons)
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78.20.Bh
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(Theory, models, and numerical simulation)
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78.55.Hx
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(Other solid inorganic materials)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 62125402 and 62321166653). |
Corresponding Authors:
Lijun Zhang
E-mail: lijun_zhang@jlu.edu.cn
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Cite this article:
Jiahao Xie(颉家豪), Zewei Li(李泽唯), Shengqiao Wang(王晟侨), and Lijun Zhang(张立军) Light emission from multiple self-trapped excitons in one-dimensional Ag-based ternary halides 2024 Chin. Phys. B 33 117102
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