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Microwave-assist hydrothermal synthesis and luminescence of NaGd(WO4):Tb3+ phosphors: A case study for the energy saving in the synthesis of phosphors

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  • Liu, Yongxin
  • Yue, Xuejun
  • Cai, Kun
  • Deng, Haidong
  • Zhang, Ming

Abstract

NaGd(WO4):Tb3+ phosphors are synthesized successfully by the microwave-assist hydrothermal process. The TEM (Transmission electron microscopy) images show that the addition of PVP (polyvinylpyrrolidone) has an obvious influence on the morphology of samples. NaGd(WO4):Tb3+ samples are of microspindles and microcuboids when 0.45 g and 1.00 g of PVP are added in the synthesis. The XRD patterns and Raman shifts indicate that the samples with pure tetragonal phase can be obtained under the current synthesis condition. The excitation and emission spectra of NaGd(WO4):Tb3+ microcrystals show that there exist energy transfers between the WO42− groups and Tb3+ ions. Under the excitation at 261 nm, NaGd(WO4):Tb3+ samples show dominant green emission originating from the 5D4 → 7F5 transition of Tb3+. The decay lifetimes of samples are fitted well with the second-order exponential decay curve. The emission intensity decreases gradually with the increase of temperature. Also, there are blue shifts for the location of green emission peak with the increase of temperature.

Suggested Citation

  • Liu, Yongxin & Yue, Xuejun & Cai, Kun & Deng, Haidong & Zhang, Ming, 2015. "Microwave-assist hydrothermal synthesis and luminescence of NaGd(WO4):Tb3+ phosphors: A case study for the energy saving in the synthesis of phosphors," Energy, Elsevier, vol. 93(P2), pages 1413-1417.
    • Handle: RePEc:eee:energy:v:93:y:2015:i:p2:p:1413-1417
    DOI: 10.1016/j.energy.2015.10.062
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    References listed on IDEAS

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    1. Lin, Jintai & Zeng, Zhi & Ma, Qianmin & Wang, Qianming & Zhang, Yanfen, 2014. "Effects of multiple irradiations on luminescent materials and energy savings – A case study for the synthesis of BaMO4: Ln3+ (M = W, Mo; Ln = Eu, Tb) phosphors," Energy, Elsevier, vol. 64(C), pages 551-556.
    2. Lian, Hongzhou & Hou, Zhiyao & Shang, Mengmeng & Geng, Dongling & Zhang, Yang & Lin, Jun, 2013. "Rare earth ions doped phosphors for improving efficiencies of solar cells," Energy, Elsevier, vol. 57(C), pages 270-283.
    3. Acevedo, Luis & Usón, Sergio & Uche, Javier, 2014. "Exergy transfer analysis of microwave heating systems," Energy, Elsevier, vol. 68(C), pages 349-363.
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    Keywords

    NaGd(WO4):Tb3+; Energy saving; Microstructure; Luminescence;
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