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Synthesis and photoluminescence properties of a novel Ca2LaNbO6:Mn4+ double perovskite phosphor for plant growth LEDs

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Abstract

In this paper, a series of Ca2LaNbO6 (CLN):Mn4+ far-red phosphors with different doping concentration were successfully prepared by traditional high temperature solid state method at 1250 °C. The samples were characterized and analyzed by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), photoluminescence excitation (PLE) spectra, photoluminescence (PL) spectra, ultraviolet–visible diffuse reflectance spectra (UV–Vis DRS), temperature-dependent emission spectra and internal quantum efficiency (IQE). The particle size of CLN is < 3 μm. The strongest excitation peak of CLN:Mn4+ phosphors lies at 352 nm, which is attributed to the 4A2g → 2T2g transition of Mn4+ ions. The sample has a strong emission peak at 684 nm, which corresponds to the 2Eg → 4A2g energy level transition of Mn4+ ions. The optimum doping concentration of the sample is 0.03 mol%, and the quenching mechanism is dipole–quadrupole interaction. In addition, the thermal activation energy of the sample was calculated to be 0.368 eV. Importantly, under the excitation of near-ultraviolet light at 365 nm and driven by 25 mA current, the LED with CLN:0.0003Mn4+ emits bright far-red light. All the results indicated that CLN:Mn4+ phosphors have potential application value in indoor plant cultivation.

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Acknowledgments

This work was supported by the Doctoral Research Foundation of Hebei Normal University of Science and Technology (Grant No. 2016YB003), Hebei provincial science and Technology Department Project (Grant No. 17227302D). 2018 National College Students’ innovation and entrepreneurship training project (Grant No. 201810798006). We also gratefully acknowledge the instrumental analysis center of Hebei Normal University of Science and Technology.

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Authors and Affiliations

  1. College of Chemical Engineering, Hebei Normal University of Science and Technology, Qinhuangdao, 066600, China

    Lei Shi, Ya-jie Han, Zi-han Li, Huan-huan Li, Jia-ying Zhang & Zhi-wei Zhang

  2. College of Agronomy and Biotechnology, Hebei Normal University of Science and Technology, Qinhuangdao, 066600, China

    Zhi-xin Ji

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  1. Lei Shi
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Shi, L., Han, Yj., Ji, Zx. et al. Synthesis and photoluminescence properties of a novel Ca2LaNbO6:Mn4+ double perovskite phosphor for plant growth LEDs. J Mater Sci: Mater Electron 30, 15504–15511 (2019). https://doi.org/10.1007/s10854-019-01927-4

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