Continuous hydrothermal synthesis of ZnGa2O4:Mn2+ nanoparticles at temperatures of 300–500°C and pressures of 25–35MPa

  • Hayashi H
  • Suino A
  • Shimoyama K
 et al. 
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Abstract

Mn2+ doped ZnGa2O4 particles were continuously synthesized in subcritical and supercritical water using a flow hydrothermal reaction system. Zn, Ga and Mn nitrates were used as the starting materials. The syntheses were carried out at temperatures from 300 to 500 °C, at pressures from 25 to 35 MPa, at KOH concentration of 0.04 M, and for residence times from 0.13 to 1.13 s. X-ray diffraction (XRD), transmission electron microscopy (TEM), thermogravimetric differential thermal analysis (TG-DTA) and photoluminescent spectroscopy were used to characterize the samples. Single phase of ZnGa2O4 was achieved at residence times of less than 1 s. The crystallite sizes were in the range from 12 to 21 nm which tend to increase with an increase in the reaction temperature and with a decrease in the reaction pressure. Green emission was observed for the annealed samples under reducing conditions whereas as-synthesized samples did not exhibit photoluminescence.

Author-supplied keywords

  • Green phosphor
  • Hydrothermal synthesis
  • Mn doping
  • Supercritical water
  • Zinc gallate

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Authors

  • Hiromichi Hayashi

  • Atsuko Suino

  • Kenji Shimoyama

  • Masafumi Takesue

  • Suguru Tooyama

  • Richard L. Smith

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