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Temperature-dependent self-trapped exciton emission in Cu(I) doped zinc-based metal halides from well-resolved excited state structures

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Abstract

Zero-dimensional metal halides are of unique structures and tunable photoluminescence properties, showing great potential applications such as light-emitting diodes (LEDs) and sensing. Herein, we successfully synthesized Cu+ doped (MA)2ZnCl4 metal halides by a slow evaporation solvent method. The introduction of Cu+ results in sky-blue self-trapped exciton emission in (MA)2ZnCl4 at 486 nm at room temperature, and a photoluminescence quantum yield is as high as 54.9%. Interestingly, at low temperatures, Cu+-doped (MA)2ZnCl4 exhibits two emission peaks located at 482 and 605 nm, respectively. This temperature-dependent dual emission indicates two excited state structures that exist on the triplet excited-state potential energy surface. In addition, the temperature sensor we fitted has good performance (Sr = 1.65 %·K−1), which is the first attempt in Cu+ doped Zn-based metal halides. Our work enriches the family of sky-blue metal halides and provides a promising strategy for building sky-blue LEDs.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 22175043 and 52162021) and Guangxi Science and Technology Plan Project (No. Guike AA23073018). The calculation was supported by the high-performance computing platform of Guangxi University.

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  1. State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, School of Physical Science and Technology, Guangxi University, Nanning, 530004, China

    Yunlong Bai, Shuai Zhang, Nengneng Luo, Bingsuo Zou & Ruosheng Zeng

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  1. Yunlong Bai
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  2. Shuai Zhang
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  3. Nengneng Luo
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Correspondence to Ruosheng Zeng.

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Temperature-dependent self-trapped exciton emission in Cu(I) doped zinc-based metal halides from well-resolved excited state structures

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Bai, Y., Zhang, S., Luo, N. et al. Temperature-dependent self-trapped exciton emission in Cu(I) doped zinc-based metal halides from well-resolved excited state structures. Nano Res. (2024). https://doi.org/10.1007/s12274-024-6664-8

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  • DOI: https://doi.org/10.1007/s12274-024-6664-8

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