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Broadband near-infrared luminescence properties of fluoride phosphor K3AlF6:Cr3+

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Abstract

Near-infrared light can be widely used in non-destructive testing, sensing, and night vision. Recently, phosphor-converted LED (pc-LED) based on near-infrared (NIR) phosphor have attracted considerable interest. In this work, tetragonal structured K3AlF6:Cr3+ phosphors were synthesized using the co-precipitation method. Cr3+ ions occupy the octahedral position, and its Dq/B value (the parameter describing the crystal field strength) is calculated to be 2.08, suggesting a weak crystal field. Upon blue light excitation (430 nm), a broadband NIR emission is observed in the range of 650–900 nm, corresponding to the spin-allow 4T2 → 4A2 transition. Increasing Cr3+ concentration, red-shift is observed in its NIR emission with the maximum emission intensity at 5 mol% Cr3+. Its activation energy ΔE is calculated to be 0.14 eV. Combining with blue InGaN chips, the fabricated NIR pc-LEDs based on K3AlF6:Cr3+ phosphor exhibit excellent optoelectronic performance, showing potential applications in biological detection.

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Data availability

The raw/processed data required to reproduce these findings cannot be shared at this time as the data also forms part of an ongoing study, but the data are available on request from the corresponding author.

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Acknowledgements

This work was supported by the National Science Foundation of China (No. 12104415), China Postdoctoral Science Foundation (No.2022M721301), Postdoctoral Science Foundation of Henan Henan Province (No.202103102), Key Research Project of Department of Science and Technology in Henan Province (No. 222102230012, No. 232102230125, No. 232102231057, No. 232102230151 and No. 222102210180).

Funding

This work was funded by Innovative Research Group Project of the National Natural Science Foundation of China, 12104415, Yongfu Liang.

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Authors and Affiliations

  1. College of Electronics and Information, Zhengzhou University of Light Industry, Zhengzhou, 450002, Henan, China

    Junbo Wang, Xuerui Cheng, Huanjun Zhang, Haining Li, Yongfu Liang, Xiang Zhu & Zheng Wang

  2. Henan Key Laboratory of Magnetoelectric Information Functional Materials, Zhengzhou, 450002, Henan, China

    Junbo Wang, Xuerui Cheng, Huanjun Zhang, Haining Li, Yongfu Liang, Xiang Zhu & Zheng Wang

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  1. Junbo Wang
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Contributions

Junbo Wang: writing original draft. Xuerui Cheng: investigation and editing. Huanjun Zhang: software and analysis. Haining Li: methodology and measurement. Yongfu Liang: formal analysis and investigation. Xiang Zhu: material synthesis. Zheng Wang: validation.

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Correspondence to Xuerui Cheng or Huanjun Zhang.

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Wang, J., Cheng, X., Zhang, H. et al. Broadband near-infrared luminescence properties of fluoride phosphor K3AlF6:Cr3+. J Mater Sci: Mater Electron 35, 787 (2024). https://doi.org/10.1007/s10854-024-12533-4

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