Eu3+ doped and Er3+/Yb3+ codoped glass ceramics containing NaLa(WO4)2 nanoparticles: Preparation, optical and temperature sensing properties

Eu3+ doped and Er3+/Yb3+ codoped glass ceramics containing NaLa(WO4)2 nanoparticles have been prepared and their optical and temperature sensing properties have been investigated. Strong diffraction peaks and elliptical NaLa(WO4)2 nanoparticles with well-defined lattice stripes are observed in the X-ray diffraction and transmission electronic microscope results, respectively. Great enhancement of the photoluminescence intensity of Eu3+ ions is observed owing to the selective entering of Eu3+ ions into the precipitated NaLa(WO4)2 nanoparticles. The improvement of visible upconversion emissions and near-infrared photoluminescence emissions of Er3+/Yb3+ ions are also attributable to the enrichment of Er3+/Yb3+ ions in the low phonon-energy NaLa(WO4)2 nanoparticles. The temperature dependence fluorescence intensity ratio was investigated and the temperature sensing characteristics was evaluated. The maximum temperature sensitivity Sa is 0.014K−1 at 476 K, which demonstrates Er3+/Yb3+ codoped NaLa(WO4)2:glass ceramic is one of the candidates for new optical temperature-sensing application.