Unraveling the Origin of Long-Lifetime Emission in Low-Dimensional Copper Halides via a Magneto-optical Study,Nano Letters

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Unraveling the Origin of Long-Lifetime Emission in Low-Dimensional Copper Halides via a Magneto-optical Study
Nano Letters ( IF 9.6 ) Pub Date : 2023-12-12 , DOI: 10.1021/acs.nanolett.3c03874
Xing Wang ₁ , Chengcheng Wang ₁ , Cong Tao ₁ , Zhiyuan Kuang ₁ , Xinrui Wang ₁ , Lei Xu ₁ , Yingqiang Wei _{1,

2} , Qiming Peng ₁ , Wei Huang _{1,

3} , Jianpu Wang _{1,

4}

Affiliation

The origin of the long lifetime of self-trapped exciton emission in low-dimensional copper halides is currently the subject of extensive debate. In this study, we address this issue in a prototypical zero-dimensional copper halide, Cs₂(C₁₈)₂Cu₂I₄-DMSO, through magneto-optical studies at low temperatures down to 0.2 K. Our results exclude spin-forbidden dark states and indirect phonon-assisted recombination as the origin of the long photoluminescence lifetime. Instead, we propose that the minimal Franck–Condon factor of the radiative transition from excited states to the ground state is the decisive factor, based on the transition probability analysis. Our findings offer insights into the electronic processes in low-dimensional copper halides and have the potential to advance the application of these distinctive materials in optoelectronics.

中文翻译：

通过磁光研究揭示低维卤化铜长寿命发射的起源

低维卤化铜自俘获激子发射的长寿命的起源目前是广泛争论的主题。在本研究中，我们通过低至 0.2 K 的低温磁光研究，在原型零维卤化铜 Cs ₂ (C ₁₈ ) ₂ Cu ₂ I ₄ -DMSO 中解决了这个问题。我们的结果排除了自旋禁阻。暗态和间接声子辅助复合是长光致发光寿命的起源。相反，我们根据跃迁概率分析，提出从激发态到基态的辐射跃迁的最小弗兰克-康登因子是决定性因素。我们的研究结果提供了对低维卤化铜电子过程的见解，并有可能推动这些独特材料在光电子学中的应用。

更新日期：2023-12-12

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