Constructing high sensitivity thermometry with dual-emitting Nd/Er/Yb codoped BaWO single crystal material.

Inorganic oxides doped with rear earth(RE) have attracted much interest because of their outstanding optical properties. In this paper, the BaWO:Yb/Er/Nd phosphors were successfully prepared by typical solid state method. The crystalline structure of the samples was characterized through X-ray diffraction(XRD). The morphology of that was demonstrated with field emission scanning electron microscopy(FE-SEM). Under 980 nm excitation, the BaWO: Yb/Er/Nd phosphor presented four typical emissions at green(524-550 nm, Er), red(∼655 nm, Er), near infrared(∼710 nm, ∼820 nm, Nd). Furthermore, the temperature sensing properties of the samples were investigated in the temperature range of 303-573 K. The fluorescence intensity ratio(FIR) technique based on thermal and non-thermal coupled levels was applied to analyse the sensing performances. For BaWO:Yb/Er/Nd phosphor, the maximum absolute sensitivity reached 0.0423 K at 303 K, which is based on H(Er) and F(Nd) levels. The repeatability of temperature response also was proved through four cold and heat cycles. The above result indicated that the BaWO:Yb/Er/Nd phosphor would be a promising temperature sensing materials.