Glycothermal synthesis and photoluminescence of MgGa2O 4:Mn2+ nanophosphors: Comparison to ZnGa2O 4:Mn2+ nanophosphors

Masahiro Takesada, Morio Osada, Tetsuhiko Isobe

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Abstract

The photoluminescence (PL) intensity of MgGa2O 4:Mn2+ (MGM) nanophosphors synthesized by glycothermal reaction are ∼75 times higher than that of ZnGa2O 4:Mn2+ (ZGM) nanophosphors. We discuss this reason from the following points of view: (i) Mn contents, (ii) particle size, (iii) crystallinity, (iv) spontaneous pressure, (v) emission mechanism, and (vi) Mn2+ state. Judging from the results of the X-ray fluorescence analysis, transmission electron microscopy, X-ray diffractometry, PL spectroscopy, and electron paramagnetic resonance spectroscopy, the more homogeneous distribution of Mn2+ ions in the matrix of MGM is the predominant factor for determining the PL intensity. Mn2+ ions are more homogeneously incorporated into ZGM after post-heat-treatment at 1200°C for 1 h in Ar in comparison to MGM. This is explained by the geometrical reason: the order of ionic radius for tetrahedral coordination is Mg 2+ (71 pm) < Zn2+ (74 pm) < Mn2+ (80 pm). These results indicate that the glycothermal reaction promotes the incorporation of Mn2+ in MGM nanosphosphor, resulting in the higher PL intensity of MGM than that of ZGM. This is attributed to the formation of the low-crystallized MGM glycoxide precursor with the higher homogeneous mixture of different metallic ions.

Original languageEnglish
Pages (from-to)J97-J101
JournalJournal of the Electrochemical Society
Volume156
Issue number5
DOIs
Publication statusPublished - 2009 Apr 8

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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