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Treatment with Na2SO3 alkaline reductant to restore luminescence intensity and improve the moisture resistance of deteriorated Mn4+-doped fluoride phosphors

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Abstract

Enhancing the moisture resistance of Mn4+-doped fluoride phosphors is crucial for solid-state lighting (SSL) and liquid crystal display (LCD). Herein, the deteriorated K2AF6:Mn4+ (A = Ti, Si) phosphors were restored with Na2SO3 alkaline reductant, and optimal treatment conditions were systematically determined. The kinetic process for luminescence degradation and restoration, as well as the corresponding reparation mechanism were investigated in detail. These results showed that SO32− anion can reduce Mn4+ to Mn2+, rapidly remove the dark-brown layer of the degradation product, and restore the luminescence intensity of K2AF6:Mn4+ to more than 95%. Therefore, the restored K2TiF6: Mn4+ and K2SiF6: Mn4+ samples exhibit excellent moisture resistance, maintaining to be 66 and 76% of the initial intensity after immersing in deionized water for 300 min. Furthermore, fabricated white light-emitting device using the restored K2TiF6: Mn4+ phosphor also possess color rendering index of 94.2 and correlated color temperature of 3270 K. Our results provide a feasible strategy to significantly improve the moisture resistance of fluoride phosphors, demonstrating a great promise in phosphor-converted white-LED toward lighting and display field.

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Acknowledgements

The work was supported by the National Natural Science Foundation of China (51962005, 52102172, 21805118), Key Special Project of Science and Technology to Help Economy in Jiangxi Province [2020]87, the Key Research and Development Program of Jiangxi Province (20192ACB50021) and the Youth Jinggang Scholars Program in Jiangxi Province [2018]82. It was also supported by the cultivation project of the State key Laboratory of Green Development and High-value Utilization of Ionic Rare Earth Resources in Jiangxi Province (20194AFD44003), the Research Project of Education Department of Jiangxi Province (No. GJJ210846), and the Doctoral Scientific Research Foundation of Jiangxi University of Science and Technology (205200100554).

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  1. Yan Li and Lili Liu contributed equally to this work.

Authors and Affiliations

  1. Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou, 341000, People’s Republic of China

    Yan Li, Lili Liu, Jiaxing Zuo, Songbin Liu, Fengli Yang, Jiaqing Peng & Xinyu Ye

  2. Key Laboratory of Rare Earth Luminescence Materials and Devices of Jiangxi Province, Ganzhou, 341000, People’s Republic of China

    Yan Li, Lili Liu, Jiaxing Zuo, Songbin Liu, Fengli Yang, Jiaqing Peng & Xinyu Ye

  3. National Rare Earth Functional Material Innovation Center, Ganzhou, 341000, People’s Republic of China

    Songbin Liu, Fengli Yang, Jiaqing Peng & Xinyu Ye

  4. Key Laboratory of Testing and Tracing of Rare Earth Products for State Market Regulation, Jiangxi University of Science and Technology, Ganzhou, 341000, People’s Republic of China

    Youming Yang & Xinyu Ye

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  1. Yan Li
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Li, Y., Liu, L., Zuo, J. et al. Treatment with Na2SO3 alkaline reductant to restore luminescence intensity and improve the moisture resistance of deteriorated Mn4+-doped fluoride phosphors. J Mater Sci 57, 15737–15751 (2022). https://doi.org/10.1007/s10853-022-07638-2

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