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Template-free hydrothermal synthesis and luminescence properties of NaGd(WO4)2:Eu3+ red phosphors with controlled morphology

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Abstract

A series of morphology-controlled NaGd(WO4)2:Eu3+ phosphors were prepared by a facile hydrothermal method in the absence of any surfactants and templates. X-ray diffraction, scanning electron microscopy and photoluminescence spectra were used to characterize the obtained products. It was found that the pH value of the precursor solution had a remarkable impact on the phase structure, morphology and luminescent properties of the products. The possible formation mechanism for square plate structure was proposed based on the time-dependent experiments. Moreover, the effects of the initial pH value, reaction time and Eu3+ concentration on the luminescent properties of NaGd(WO4)2:Eu3+ phosphors were investigated in detail. The results revealed that the square plate-like microcrystals synthesized at pH = 8 for 20 h showed excellent red emission under near-ultraviolet (NUV) excitation. In addition, no concentration quenching occurred when the Eu3+ concentration was as high as 0.6. The intense red emission and high red color purity showed that NaGd(WO4)2:Eu3+ microplates had promising applications as red component in NUV-excited WLEDs.

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Acknowledgements

This work was supported by National Natural Science Foundation of China (Grant No. 51302061), Post-graduate’s Innovation Fund Project of Hebei University (No. X201718) and College Student Training Program for Innovation and Entrepreneurship of Hebei University (2017128).

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Authors and Affiliations

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

    Yongqing Zhai, Xin Zhao, Qinglin Sun, Shuai Yang, Derui Deng, Yaru Liu, Manhong Miao & Jing Wang

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  1. Yongqing Zhai
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  2. Xin Zhao
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  3. Qinglin Sun
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  4. Shuai Yang
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  8. Jing Wang
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Correspondence to Yongqing Zhai or Jing Wang.

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Zhai, Y., Zhao, X., Sun, Q. et al. Template-free hydrothermal synthesis and luminescence properties of NaGd(WO4)2:Eu3+ red phosphors with controlled morphology. J Mater Sci: Mater Electron 29, 5034–5041 (2018). https://doi.org/10.1007/s10854-017-8465-2

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