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We have synthesized Mn4+-doped mixed tetragermanate phases in the Li2Ge4O9­LiNaGe4O9 system, i.e., Li(Li,Na)Ge4O9, 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 E1⁄4A2 transition, and the entire substitution resulting in an LiNaGe4O9 phase provided an improvement of quenching temperature for the emission. Furthermore, the LiNaGe4O9 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.

journal of the ceramic society of japan

Mn-doped LiNaGe&lt;sub&gt;4&lt;/sub&gt;O&lt;sub&gt;9&lt;/sub&gt; as a rare-earth free phosphor: impact of Na-substitution on emission in tetragermanate phase