Luminescence and temperature sensing properties of Er3+/Yb3+ co-doped Ba3.75Sr1.24-xEr0.01Ybx Nb10O30 at the tetragonal-orthorhombic phase boundary

• Main Authors: Simiao Wang, Yanxia Li, Yan Zhao, Rui Hu, Xusheng Wang, Xi Yao
• Format: Article
• Language: English
• Published: AIP Publishing LLC 2020-04-01
• Series: AIP Advances
• Online Access: http://dx.doi.org/10.1063/1.5145339

Er3+ doped BaxSr0.998-xEr0.002Nb2O6 (SBNx, x = 0.25, 0.40, 0.50, 0.60, 0.75) and Er–Yb co-doped Ba3.75Sr1.24-xEr0.01YbxNb10O30 (SBN75, x = 0, 1:10, 1:20, 1:25, 1:30) ferroelectric ceramics were synthesized by a solid-state reaction method. With the change in stoichiometric x, upconversion (UC) luminescence and temperature sensing properties of the SBN were investigated. The sample (SBN75) at the morphotropic phase boundary is found to obtain the highest emission intensity. For Er–Yb co-doped Ba3.75Sr1.24-xEr0.01YbxNb10O30 ceramics, bright UC green and red emissions originated from a two-photon energy-transfer process were observed under 980 nm laser excitation. The temperature sensing properties were measured by means of a fluorescence intensity ratio technique, and the maximum sensitivity was approximately 0.0074 K−1 at 631 K in the sample SBN75:0.01Er/0.20Yb. From these findings, Er3+ ions doped in SBN ceramic, at the O-T phase boundary, have potential applications for temperature sensors.