The color-tunable up-conversion photoluminescence properties of Na0.5Bi0.5TiO3:Yb3+/Tm3+ ceramics and its temperature sensing application based on the intrinsic defects

摘要

Developing an alternative solution to reduce or not use the rare-earth ions is of much importance. Tunable up-conversion (UC) multicolor luminescence is realized by utilizing the green UC emission of the intrinsic defects and optimizing the doping contents of Yb3+ and Tm3+ ions in the Na0.5Bi0.5-x-yYbxT-m(y)TiO(3) (NBT: xYb/yTm) ceramics. The UC white-light emission, which is close to the standard achromatic point, is achieved by an optimal design. And the possible up-conversion emission mechanism of defects and Tm3+/Yb3+ ions is also discussed. In addition, the optical temperature sensing properties were also investigated basing on the UC emission of defects in a temperature range from 83 to 683 K. The results indicate that the NBT:xYb/yTm is promising for the application as optical thermometry materials. (C) 2019 Elsevier B.V. All rights reserved.