Abstract
In the present work, we have synthesized pure and Ho/Yb-co-doped 0.5Ba0.7Sr0.3TiO3-0.5BaZr0.2Ti0.8O3 ceramics using a solid-state reaction technique. The prepared pure 0.5Ba0.7Sr0.3TiO3-0.5BaZr0.2Ti0.8O3 ceramics were found in the morphotropic phase boundary region, and exhibit high piezoelectric and dielectric properties. Under a 980-nm excitation, strong green, red and near-infrared (NIR) upconversion (UC) photoluminescence is observed in Ho/Yb-co-doped samples. It is found that the color of UC emission could be tuned by changing the concentration of sensitizer Yb ions in the host matrix. Furthermore, optical temperature sensing properties based on the green and NIR UC emissions of BSZT:0.005Ho/0.01Yb were investigated. Fluorescence intensity ratio (FIR) between green (5F4,5S2) → 5I8 and NIR (5F4,5S2) → 5I7 UC emissions of Ho ions was studied as a function of temperature in the range of 78 K–373 K, and a maximum sensitivity 0.0206 K−1 at 97 K was obtained.
Published Version
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