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Characterization of the structure and photoluminescence properties of tetragonal structure La0.995Pr0.005VO4 phosphor via a post heat treatment

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Abstract

A hydrothermal method is used to prepare La0.995Pr0.005VO4 nano-crystal phosphors, which are then post heat treated at 500–800°C for 4 h. The X-ray diffraction patterns show that the La0.995Pr0.005VO4 phosphors retain a tetragonal structure at a lower temperature (500 and 600°C). When the temperature is greater than 600°C, the structure of La0.995Pr0.005VO4 changes from the t-zircon-type to the m-monazite-type lanthanum orthovanadates (LaVO4) structure. The temperature at which the structure changes (Tst) is measured using differential scanning calorimetry as 625°C. The scanning electron microscopy results show that the surface morphology of the phosphor particles is granular and has a uniform distribution. The particle size increases from 0.1 to 2.5 μm as the temperature is increased. The excitation spectra show that the absorption behaviour for the t-zircon-type and the m-monazite-type La0.995Pr0.005VO4 phosphor is not significantly different, but there is a little red shift due to host absorption for La0.995Pr0.005VO4 with an m-monazite-type structure. Under excitation at 315 nm, the main emission band retains the characteristics of Pr3+ ion-doped LaVO4 phosphor, which is attributed to the host luminescent and the 1D2 → 3H4, 3P0 → 3H6 electron transition of the Pr3+ ion. As the temperature for the heat treatment increases, the intensity of the excitation and emission peaks has a maximum value for a temperature of 600°C and the intensity decreases as the temperature increases further, because the structure of La0.995Pr0.005VO4 phosphors changes from tetragonal to monoclinic when the heat-treatment temperature exceeds 600°C. This demonstrates that the tetragonal structure is better than the monoclinic structure for LaVO4 if it is used as a host material for phosphor applications. The colour tones are initially in the white light region for La0.995Pr0.005VO4 phosphors heat treatment at 500 and 600°C. When the heat-treatment temperature is greater than 600°C, the colour tones shift to the orange light region.

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Acknowledgements

We would like to thank the Ministry Science and Technology of the Republic of China for financially supporting this project under Grant MOST 105-2221-E-150-055-MY3.

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Authors and Affiliations

  1. Department of Mechanical Engineering, National Pingtung University of Science and Technology, Pingtung, 912, Taiwan

    Hao Long Chen & Lay Gaik Teoh

  2. Department of Electronic Engineering, Cheng Shiu University, Kaohsiung, 347, Taiwan

    Kuan Ting Liu

  3. Department of Digital Game and Animation Design, Tungfang Design University, Kaohsiung, 821, Taiwan

    Sean Wu

  4. Department of Electronic Engineering, National Formosa University, Yunlin, 632, Taiwan

    Yee Shin Chang

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  1. Hao Long Chen
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  2. Lay Gaik Teoh
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  3. Kuan Ting Liu
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Correspondence to Yee Shin Chang.

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Chen, H.L., Teoh, L.G., Liu, K.T. et al. Characterization of the structure and photoluminescence properties of tetragonal structure La0.995Pr0.005VO4 phosphor via a post heat treatment. Bull Mater Sci 44, 24 (2021). https://doi.org/10.1007/s12034-020-02286-1

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  • DOI: https://doi.org/10.1007/s12034-020-02286-1

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