Structural and Optical Properties of LiGd1-xLux(WO4)2 Co-Doped with Yb3+/Er3+ Synthesized via Solid State Reaction Method
DOI:
https://doi.org/10.26565/2312-4334-2026-3-31Keywords:
Double tungstate, Yb3 /Er3 co-doping, Up-conversion, Green emissionAbstract
Double tungstate materials have been extensively studied and have attracted much attention as solid state lighting hosts. These materials with general formula AB(WO4)2 (A: alkali metal and B: trivalent rare earth ion) are widely used for their great optical properties. In this work, Gd3+ions were partially substituted with Lu3+ ions to synthesize the LiGd1-xLux(WO4)2 compounds in order to study the structural, vibrational and optical behaviors of LiGd1-xLux(WO4)2 co doped with Yb3+ and Er3+ ions. Using the solid-state reaction, different concentrations of Lu3+ (x=2.5%, 5%, 80%, 90%, and 95%) were selected to synthesize our compounds. These concentrations influence the vibrational characteristics of the W-O bond through both band broadening and a shift in the symmetric stretching mode (ν1). For the optical properties, green up-conversion under 980 nm excitation and down-conversion under 380 nm excitation of the double tungstate co-doped with Yb3+ and Er3+ were observed in the range of 530-552 nm. The lifetimes of the 2H11/2 and 4S3/2 levels, as well as the effect of Lu3+ substitution on the green emission of Er3+ in these compounds, were compared and discussed.
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