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Facile hydrothermal synthesis and luminescent properties of monodisperse ellipsoid-like NaLa(MoO4)2:Sm3+ red-emitting phosphors

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Abstract

Monodisperse ellipsoid-like NaLa(MoO4)2:Sm3+ micro-particles were prepared by a facile hydrothermal method at 180 °C for 12 h without using any additives. The crystal structure, micro-morphology and luminescent property of as-synthesized phosphors were characterized by powder X-ray diffraction, scanning electron microscopy and fluorescent spectrophotometer. The results show that the starting pH values are responsible for the formation of pure tetragonal phase and uniform ellipsoid-like NaLa(MoO4)2:Sm3+ micro-particles. A possible morphological formation mechanism of the ellipsoids has been presented according to time-dependent experiments. The main emission peak of ellipsoid-like NaLa(MoO4)2:Sm3+ is located at 647 nm under the excitation of 405 nm, which is originated from the electric dipole transition of 4G5/2 → 6H9/2 of Sm3+ (red-emitting). Furthermore, it is found that the luminescent intensity is influenced by the starting pH values, the hydrothermal reaction time and the concentration x of Sm3+. Meanwhile, the mechanism of concentration quenching of Sm3+ has been determined to the electric dipole–dipole interaction on the basis of the relevant theory and experiment data. Because of a strong red emission under the excitation of near-ultraviolet, ellipsoid-like NaLa(MoO4)2:Sm3+ phosphors may have potential application in the fields of field emission displays, solid state lighting and optoelectronic devices.

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Acknowledgments

This work was supported by National Natural Science Foundation of China (Grant No. 21301046) and Post-graduate’s Innovation Fund Project of Hebei University (No. X2016088).

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Authors and Affiliations

  1. College of Chemistry and Environmental Science, HeBei University, Baoding, 071002, China

    Yongqing Zhai, Wan Zhang, Yanjie Yin, Junyan Wang, Cuichen Hu & Xuemin Li

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  1. Yongqing Zhai
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  2. Wan Zhang
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  3. Yanjie Yin
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Correspondence to Yongqing Zhai.

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Zhai, Y., Zhang, W., Yin, Y. et al. Facile hydrothermal synthesis and luminescent properties of monodisperse ellipsoid-like NaLa(MoO4)2:Sm3+ red-emitting phosphors. J Mater Sci: Mater Electron 27, 9690–9698 (2016). https://doi.org/10.1007/s10854-016-5030-3

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