Mn-doped LiNaGe<inf>4</inf>O<inf>9</inf> as a rare-earth free phosphor: Impact of Na-substitution on emission in tetragermanate phase

Rie Suzuki, Jun Kunitomo, Yoshihiro Takahashi, Kensaku Nakamura, Minoru Osada, Nobuaki Terakado, Takumi Fujiwara

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

We have synthesized Mn<sup>4+</sup>-doped mixed tetragermanate phases in the Li<inf>2</inf>Ge<inf>4</inf>O<inf>9</inf>LiNaGe<inf>4</inf>O<inf>9</inf> system, i.e., Li(Li,Na)Ge<inf>4</inf>O<inf>9</inf>, by a glass-ceramic technique using stoichiometric precursor glasses, and have examined the effect of substitution of Na on their photoluminescence properties. The tetragermanate phases indicated clear red emission based on a <sup>2</sup>E→<sup>4</sup>A<inf>2</inf> transition, and the entire substitution resulting in an LiNaGe<inf>4</inf>O<inf>9</inf> phase provided an improvement of quenching temperature for the emission. Furthermore, the LiNaGe<inf>4</inf>O<inf>9</inf> phase synthesized by solid-state reaction showed a high internal quantum yield and red color purity, demonstrating it to be a possible candidate as a rare-earth-free red phosphor.

Original languageEnglish
Pages (from-to)888-891
Number of pages4
JournalNippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
Volume123
Issue number1441
DOIs
Publication statusPublished - 2015
Externally publishedYes

Keywords

  • Germanate
  • Manganese ion
  • Phosphor
  • Rare-earth free
  • Red emission

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry
  • Chemistry(all)
  • Condensed Matter Physics

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