Synthesis and long-period phosphorescence of ZnGa2O4:Mn2+ spinel

Kyota Uheda, Takuya Maruyama, Hirotsugu Takizawa, Tadashi Endo

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56 Citations (Scopus)


Novel long-period phosphor ZnGa2O4:Mn2+ was prepared by a conventional solid reaction of ZnO, Ga2O3 and Mn(NO3)2 under conditions of > 1000°C for 24 h in flowing Ar gas. The phosphor had green intense emission peaking at 503.6 nm. The improvement of emission intensity was brought out by the higher temperature processing. This implied that long lifetime phosphorescence was closely related to the formation of vacancies at the Zn2+ sites of the host lattice. The carrier trap level was positioned at 0.71 eV higher than the valence band of host lattice. The possible mechanism for prolonging the emission for a long time was discussed.

Original languageEnglish
Pages (from-to)60-64
Number of pages5
JournalJournal of Alloys and Compounds
Publication statusPublished - 1997 Nov 14


  • Green intense emission
  • Long-period phosphorescence
  • Manganese-activated phosphor
  • Non-stoichiometric spinel
  • Zinc gallates


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