Green and Red Up-Conversion Luminescence of Er 3+/Yb3+ Co-Doped 0.94Na0.5Bi0.5TiO3-0.06 BaTiO3 Ceramics

The Er3+/Yb3+ co-doped 0.94Na(0.5)Bi(0.5)TiO(3)-0.06BaTiO(3) (NBT-BT:Er3+/Yb3+) cera-mics were synthesized by a traditional solid state reaction method. The XRD patterns show that all the ceramics are the single phase with perovskite structure. Under the excitation of 980 nm laser diode, the samples exhibit bright green up-conversion (UC) emission bands, which corresponds to the radiative transitions from ((S3/2,H11/2)-S-4-H-2) to I-4(15/2), respectively. By tailoring the ratio of Er3+/Yb3+, the optimal UC emission properties were obtained in NBT-BT:0.01Er, 0.10Yb ceramics. 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 0.0040K(-1) at 502K. Moreover, ferroelectric and dielectric properties were enhanced with small amount of Er3+/Yb3+ co-doped. These ceramics, with excellent properties, may be a potential candidate in the application for electro-optical devices.