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Mechanism of morphology formation and energy transfer of NaLa(WO4)2:Sm3+:Eu3+ phosphors

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Abstract

A series of phosphors of Sm3+ and Eu3+ single-doped or co-doped NaLa(WO4)2 matrix are synthesized with the hydrothermal method. The structure, morphology, luminescent properties, quantum efficiency and CIE coordinates of sample are characterized and analyzed with X-ray diffraction (XRD), scanning electron microscopy (SEM and EDS), transmission electron microscope (TEM), fluorescence spectrophotometer (FL) and UV–Vis (UV) absorption spectra. The results show that all the obtained products have the scheelite structure with spherical or ellipsoidal shapes. The morphology formation mechanism is proposed as follows: nucleation—dissolution—recrystallization—crystal growth (self-assembly process). Under 393- and 403-nm photoexcitation, NaLa (WO4)2:Sm3+:Eu3+ emits intense red and orange red light. In NaLa (WO4)2: Sm3+:Eu3+ sample, the energy transfer can occur from Sm3+ to Eu3+, and the critical distance of energy transfer is between 1.655 and 2.362 nm. The energy transfer mechanism is electric dipole–electric dipole interaction. The energy transfer efficiency can be over 70%. The best product NaLa(WO4)2:2%Sm3+:4%Eu3+ has a luminous efficiency of 54.70%. The CIE coordinates are X = 0.6585, Y = 0.3404.

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Acknowledgements

This work is supported by a grant from fund of Nature Science of China (Grant No. 51634005 and 51662033) and fund of Nature Science of Inner Mongolia autonomous region, China (No. 2017MS(LH)0208).

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Authors and Affiliations

  1. College of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou, 014010, Inner Mongolia, People’s Republic of China

    Jinxiu Wu, Mei Li, Zhaogang Liu & Mitang Wang

  2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, People’s Republic of China

    Jinxiu Wu & Mei Li

  3. Key Laboratory of Inner Mongolia Autonomous University on New Technologies of Modern Metallurgy and Application of Rare Earth, Baotou, 014010, Inner Mongolia, People’s Republic of China

    Jinxiu Wu, Mei Li, Huiling Jia, Zhaogang Liu & Mitang Wang

  4. College of Mechanical Engineering, Inner Mongolia University of Sciences and Technology, Baotou, 014010, Inner Mongolia, People’s Republic of China

    Huiling Jia

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  1. Jinxiu Wu
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Correspondence to Mei Li.

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Wu, J., Li, M., Jia, H. et al. Mechanism of morphology formation and energy transfer of NaLa(WO4)2:Sm3+:Eu3+ phosphors. Appl. Phys. A 125, 438 (2019). https://doi.org/10.1007/s00339-019-2724-4

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