Abstract
Ho3+/Yb3+ co-doped 0.94Na0.5Bi0.5TiO3–0.06BaTiO3 (NBT-BT:Ho3+/Yb3+) ceramics were synthesized by solid-state reaction and characterized by x-ray diffraction (XRD), luminescent, dielectric, ferroelectric and piezoelectric measurements. The XRD diffraction data showed that all the ceramics were single phase with a perovskite structure. Bright green up-conversion (UC) emission bands (545 nm) and weak red UC emission bands (660 nm) corresponded to the transitions from (5F4, 5S2) → 5I8 and 4I5 → 5I8, respectively. Furthermore, optimized UC emission intensity was observed in the NBT-BT:0.005Ho3+/0.03Yb3+ samples. The thermal behavior of UC emission in the ceramics was also investigated and the maximum sensitivity based on fluorescence intensity ratio (FIR) technology was approximately 0.0042 K−1 at 100 K. Moreover, relatively good dielectric properties (ε = 4475) and ferroelectric properties (P r = 32 μ/cm2 and E c = 37 kV) were obtained in NBT-BT:0.005Ho3+/0.005Yb3+. As a multi-functional material, NBT-BT:Ho3+/Yb3+ ceramics may be useful in electro-optical devices.
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Acknowledgement
This work was supported by the Natural Science Foundation of China (Nos. 51072136, 50932007) and Tongji University Open Test Fund on Large-scale Instrument (No. 0002015006).
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Liu, Q., Li, Y., Li, J. et al. Effect of the Yb3+ Concentration in Up-Conversion and Electrical Properties of Ho3+/Yb3+ Co-doped (0.94Na0.5Bi0.5TiO3-0.06BaTiO3) Ceramics. J. Electron. Mater. 45, 3473–3478 (2016). https://doi.org/10.1007/s11664-016-4483-8
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DOI: https://doi.org/10.1007/s11664-016-4483-8