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Synthesis and photoluminescence properties of the novel Eu3+-activated CaNa(PO3)3 phosphors

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Abstract

In this paper, Eu3+-doped CaNa(PO3)3 phosphors were successfully synthesized by the conventional solid-state method. Their phase purities and microstructure as well as luminescence properties were systematically investigated by X-ray diffraction, scanning electron microscope, and photoluminescence spectrum. The most intense excitation band centered at 394 nm suggested the sample showed a high absorption to n-ultraviolet light. Exposed to n-ultraviolet light, the orange-red luminescence could be observed, which was ascribed to the dominated 5D0 → 7F2 transition. Concentration quenching occurred as the Eu3+ doping concentration exceeded the optimal value (x = 0.3). According to our calculations of critical distance Rc (3.92 Å) and θ (= 2.85), it is believed that exchange interaction is responsible for the energy transfer mechanism in CaNa(PO3)3. The concentration dependence of decay lifetime was analyzed in detail, and it revealed the existence of self-quenching and self-trapping effect in the process of concentration quenching. The Judd–Ofelt (J–O) theory was used to analyze the symmetry of the surrounding environment of Eu3+. The quantum efficiency of CaNa(PO3)3:0.3Eu3+ was measured to be 27.54%. Besides, the CIE chromaticity coordinates and color purity of CaNa(PO3)3:0.05Eu3+ were calculated to be about (0.651, 0.348) and 95%, respectively. These findings indicate that the orange-red phosphor CaNa(PO3)3:Eu3+ has great promise in n-UV-pumped w-LEDs.

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Acknowledgements

This research was supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) and by Postgraduate Research and Practice Innovation Program of Jiangsu Normal University (2019XKT702).

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  1. Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou, 221116, People’s Republic of China

    Shengjia Wang, Chenchen Xu & Xuebin Qiao

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Wang, S., Xu, C. & Qiao, X. Synthesis and photoluminescence properties of the novel Eu3+-activated CaNa(PO3)3 phosphors. J Mater Sci: Mater Electron 31, 9605–9613 (2020). https://doi.org/10.1007/s10854-020-03503-7

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