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The pure and Mn2+-doped spinel MgAl2O4 nanopowder was formed using the well-known citrate sol–gel technique in which citric acid is used as an agent for chelation. X-ray diffraction (XRD) and a pure spinel phase for the annealed sample (at 600°C) examined the sample’s crystallinity. Corresponding functional groups were explored by Fourier Transform Infrared Spectroscopy (FTIR). The microstructure was evaluated using FE-SEM, and the chemical configuration of the constituent elements was examined by EDX spectroscopy. The analysis of absorbance spectroscopy exhibited that the bandgap has significantly decreased in the Mn-doped sample owing to the formation of dopant energy level between the valence and conduction band of spinel MgAl2O4. The fluorescence spectroscopy (FL) demonstrated sufficient emission in the green region. The comprehensive results showed that the nanocrystalline MgAl2O4 would be a promising substitute for green-emitting phosphor in modern photonics.

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Pure and Mn-Doped MgAl2O4 Spinel: Microstructure and Photophysical Exploration

  • 会议论文

  • 发表日期：

    2025年

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  • Bindiya Goswami,
  • Rajni Vats,
  • Rachna Ahlawat,
  • Gita Rani

摘要

The pure and Mn2+-doped spinel MgAl2O4 nanopowder was formed using the well-known citrate sol–gel technique in which citric acid is used as an agent for chelation. X-ray diffraction (XRD) and a pure spinel phase for the annealed sample (at 600°C) examined the sample’s crystallinity. Corresponding functional groups were explored by Fourier Transform Infrared Spectroscopy (FTIR). The microstructure was evaluated using FE-SEM, and the chemical configuration of the constituent elements was examined by EDX spectroscopy. The analysis of absorbance spectroscopy exhibited that the bandgap has significantly decreased in the Mn-doped sample owing to the formation of dopant energy level between the valence and conduction band of spinel MgAl2O4. The fluorescence spectroscopy (FL) demonstrated sufficient emission in the green region. The comprehensive results showed that the nanocrystalline MgAl2O4 would be a promising substitute for green-emitting phosphor in modern photonics.