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Single-Site Mn2+-Activated and Sr-Alloyed Ca3(PO4)2 Red Phosphors and Their Lighting Applications

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Abstract

The phosphor-converted white light-emitting diode (WLED) has received tremendous attention as a promising alternative to traditional light sources in lighting and displays. Herein, a novel broadband red emitter Ca2Sr(PO4)2:Mn2+ was successfully designed and synthesized based on the Sr-alloying and Mn-doping of Ca3(PO4)2. The phase purity of the materials was verified by x-ray diffraction (XRD) analyses, while a scanning electron microscope (SEM) coupled with an energy-dispersive spectrometer (EDS) was employed to confirm the uniform dopant distribution. XRD Rietveld refinements were further performed to clarify the site occupation of alloying Sr and the Mn dopants. Effective site engineering confined the Mn dopants in a highly symmetric Ca5 site and excluded the immersion of Sr, leading to an extraordinarily long fluorescence lifetime. Density functional theory (DFT) simulations also revealed the good potential of the materials as host matrices for activators such as Mn2+. Finally, Ca2Sr(PO4)2:Mn2+ was used to fabricate a WLED prototype based on a near-ultraviolet (n-UV) commercial LED chip, which realized a warm white-light emission and high color rendering index (Ra) of 82.9. This WLED was able to survive the long-term stability test while maintaining high luminous efficacy of ~ 60 lm/W within 20 h, showing its great potential in practical applications.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (22078138), Jiangxi Provincial Natural Science Foundation (20202ACBL203009), and "Thousand Talents Plan" of Jiangxi Province (Jxsq2018101018).

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National Natural Science Foundation of China,22078138,Sili Ren, Natural Science Foundation of Jiangxi Province,20202ACBL203009,Sili Ren.

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  1. Jiangxi Province Key Laboratory of Mining Engineering, Jiangxi University of Science and Technology, Ganzhou, People’s Republic of China

    Jian Zhou & Sili Ren

  2. School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, People’s Republic of China

    Jian Zhou & Sili Ren

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Zhou, J., Ren, S. Single-Site Mn2+-Activated and Sr-Alloyed Ca3(PO4)2 Red Phosphors and Their Lighting Applications. J. Electron. Mater. 52, 547–558 (2023). https://doi.org/10.1007/s11664-022-10024-y

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