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Optical properties of Sr2LuNbO6:Mn4+ deep-red phosphor: crystal-field splitting and multimode vibrational coupling

Sr2LuNbO6:Mn4+深红荧光粉的光学性质: 晶体场劈裂 和多模振动耦合

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Abstract

In this study, the optical properties of Sr2LuNbO6:Mn4+ deep-red phosphor synthesized with a molten salt solid-phase method were investigated in detail by using photoluminescence (PL), PL excitation (PLE), time-resolved PL, and Raman spectroscopic techniques. At room temperature, the PL spectra of the phosphor sample show a stepped shape. At cryogenic temperatures, however, the measured PL spectra are featured by two sets of multi-mode vibronic luminescence lines. Based on the variable-temperature PL spectra and Raman spectra, the dual zero-phonon lines and the two sets of multimode vibronic lines with a constant energy separation of ∼2.8 meV are identified. This study leads to the unprecedented determination of the splitting energy of the 2Eg excited-state and the confirmation of multiple vibrational modes involved within the vibronic luminescence.

摘要

本研究利用光致发光(PL)、光致发光激发(PLE)、时间分辨PL和 拉曼光谱技术等, 详细研究了通过熔盐固相法合成的Sr2LuNbO6: Mn4+深红荧光粉的光学性质. 在室温下, 样品的PL光谱呈现出阶梯状 谱形. 然而, 在低温下, 测量的PL光谱由两组多模振动电子发光谱线组 成. 基于变温PL光谱和拉曼光谱, 我们识别出双零声子谱线以及两组恒 定能量间隔为~2.8 meV的多模声子伴线. 这项研究首次发现Mn4+离子 的2Eg激发态能级在氧化物八面体晶格中具有~2.8 meV能量差的劈裂, 并证实多种振动模式深度参与Mn4+离子的振动电子发光.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (12074324 and 11374247) and the Science, Technology, and Innovation Commission of Shenzhen Municipality (JCJY20180508163404043 and JCYJ20170818141709893).

Author information

Authors and Affiliations

  1. Department of Optical Science and Engineering, School of Information Science and Technology, Fudan University, Shanghai, 200438, China

    Guanghan Zhou  (周广涵), Debao Zhang  (张德保), Jiqiang Ning  (宁吉强) & Shijie Xu  (徐士杰)

  2. School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou, 221116, China

    Fei Tang  (唐飞)

  3. Division of Natural and Applied Sciences, Duke Kunshan University, Kunshan, 215316, China

    Changcheng Zheng  (郑昌成)

Authors
  1. Guanghan Zhou  (周广涵)
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  2. Debao Zhang  (张德保)
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  3. Fei Tang  (唐飞)
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  4. Changcheng Zheng  (郑昌成)
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  5. Jiqiang Ning  (宁吉强)
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  6. Shijie Xu  (徐士杰)
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Contributions

Author contributions Zhou G and Tang F designed and synthesized the samples; Zhou G and Zhang D conducted the optical spectroscopic measurements; Zhou G, Ning J and Xu S analyzed the spectroscopic data; Zhou G and Zheng C performed the low-temperature Raman scattering measurements; Zhou G and Xu S wrote and edited the paper. Xu S supervised the study. All authors contributed to the general discussion.

Corresponding authors

Correspondence to Fei Tang  (唐飞), Jiqiang Ning  (宁吉强) or Shijie Xu  (徐士杰).

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Conflict of interest The authors declare that they have no conflict of interest.

Additional information

Supplementary information Experimental details and supporting data are available in the online version of the paper.

Guanghan Zhou received his BE degree in electronic science and technology from Shandong University (2021). He is currently a Master’s student at the Department of Optics and Engineering, Fudan University under the supervision of Prof. Shijie Xu. His research topic focuses on Mn4+-ion luminescence in oxide phosphors.

Shijie Xu earned his BE degree from the Department of Automatic Engineering, Hebei Institute of Technology in 1984, both ME and PhD degrees from the Department of Electronic Engineering, Xi’an Jiaotong University in 1989 and 1993, respectively. He is currently a CJ Chair professor at the Department of Optical Science and Engineering, School of Information Science and Technology, Fudan University. Prior to joining Fudan University, he was a tenured professor at the Department of Physics, The University of Hong Kong.

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Zhou, G., Zhang, D., Tang, F. et al. Optical properties of Sr2LuNbO6:Mn4+ deep-red phosphor: crystal-field splitting and multimode vibrational coupling. Sci. China Mater. 67, 939–945 (2024). https://doi.org/10.1007/s40843-023-2782-6

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  • DOI: https://doi.org/10.1007/s40843-023-2782-6

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