Constructing high sensitivity thermometry with dual-emitting Nd3+/Er3+/Yb3+ codoped BaWO4 single crystal material

• Published in: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Molecular and biomolecular spectroscopy, 2022-09, Vol.277, p.121284, Article 121284
• Main Authors: Liu, Hang, Jian, Xiukai, Liu, Mingtai, Wang, Bo, Wang, Kailin, Zhang, Yuhong
• Format: Article
• Language: English
• Subjects: Fluorescence intensity ratio; Non-thermal coupled levels; Repeatability; Upconversion(UC)
• ISSN: 1386-1425
• DOI: 10.1016/j.saa.2022.121284

[Display omitted] •BaWO4:Yb3+/Er3+/Nd3+ phosphors prepared by solid-state reaction.•Higher sensitivity obtained by the FIR technology based on 2H11/2(Er3+) and 4F7/2(Nd3+) levels.•Stable repeatability of temperature response. Inorganic oxides doped with rear earth(RE) have attracted much interest because of their outstanding optical properties. In this paper, the BaWO4:Yb3+/Er3+/Nd3+ 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 BaWO4: Yb3+/Er3+/Nd3+ phosphor presented four typical emissions at green(524–550 nm, Er3+), red(∼655 nm, Er3+), near infrared(∼710 nm, ∼820 nm, Nd3+). 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 BaWO4:Yb3+/Er3+/Nd3+ phosphor, the maximum absolute sensitivity reached 0.0423 K−1 at 303 K, which is based on 2H11/2(Er3+) and 4F7/2(Nd3+) levels. The repeatability of temperature response also was proved through four cold and heat cycles. The above result indicated that the BaWO4:Yb3+/Er3+/Nd3+ phosphor would be a promising temperature sensing materials.