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

• Lanthanide metal ions doped NaLa(WO 4 ) 2 :glass ceramics were fabricated. • The enhancement of upconversion and near-infrared emissions of Er 3+ ion was observed. • A high temperature sensitivity s a of 0.014 K − 1 is achieved at 476 K. Eu 3+ doped and Er 3+ /Yb 3+ codoped glass ceramics containing NaLa(WO 4 ) 2 nanoparticles have been prepared and their optical and temperature sensing properties have been investigated. Strong diffraction peaks and elliptical NaLa(WO 4 ) 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 Eu 3+ ions is observed owing to the selective entering of Eu 3+ ions into the precipitated NaLa(WO 4 ) 2 nanoparticles. The improvement of visible upconversion emissions and near-infrared photoluminescence emissions of Er 3+ /Yb 3+ ions are also attributable to the enrichment of Er 3+ /Yb 3+ ions in the low phonon-energy NaLa(WO 4 ) 2 nanoparticles. The temperature dependence fluorescence intensity ratio was investigated and the temperature sensing characteristics was evaluated. The maximum temperature sensitivity S a is 0.014K −1 at 476 K, which demonstrates Er 3+ /Yb 3+ codoped NaLa(WO 4 ) 2 :glass ceramic is one of the candidates for new optical temperature-sensing application.