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

摘要

Er 3 doped Ba x Sr 0.998-x Er 0.002 Nb 2 O 6 (SBNx, x = 0.25, 0.40, 0.50, 0.60, 0.75) and Er–Yb co-doped Ba 3.75 Sr 1.24-x Er 0.01 Yb x Nb 10 O 30 (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 Ba 3.75 Sr 1.24-x Er 0.01 Yb x Nb 10 O 30 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, Er 3 ions doped in SBN ceramic, at the O-T phase boundary, have potential applications for temperature sensors.