Size-tunable solvothermal synthesis of Zn2GeO 4: Mn2+ nanophosphor in water/diethylene glycol system

Satoru Takeshita, Joji Honda, Tetsuhiko Isobe, Tomohiro Sawayama, Seiji Niikura

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Abstract

Zn2GeO4:Mn2+ nanophosphors are synthesized from germanium(IV) oxide and acetates of zinc and manganese(II) in a mixed solvent of water and diethylene glycol (DEG) by the solvothermal reaction at 200 °C for 2 h. Phase pure Zn2GeO4:Mn2+ is obtained for the samples prepared at 0 ≥ xDEG ≥ 91.7, where xDEG is the volume percentage of DEG in the mixed solvent. The particle and crystallite sizes decrease with the increase in xDEG. The sample prepared at xDEG = 91.7 comprises the nanorods with 30.2 and 12.2 nm in mean length and width, respectively. The actual Mn concentration measured by X-ray fluorescence analysis increases with the increase in x DEG and approaches to the nominal concentration, 2.0 at %. The samples show green luminescence corresponding to the d-d transition of Mn 2+ under the irradiation of UV and near-UV light. The photoluminescence intensity reaches a maximum around xDEG ∼ 80. This is attributed to the competitive factors, the Mn concentration and the sizes of crystallites and particles.

Original languageEnglish
Pages (from-to)4494-4500
Number of pages7
JournalCrystal Growth and Design
Volume10
Issue number10
DOIs
Publication statusPublished - 2010 Oct 6

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ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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