High-sensitive optical temperature sensing based on 5D1 emission of Eu3+ in YVO4

By studying the temperature-induced red-shift of the V-O charge transfer band (CTB) edge in YVO4:10% Eu3+ , we demonstrate a high-sensitive strategy for optical temperature sensing using the combination of the temperature-induced enhancement of the excitation in the tail of the CTB and the thermal population of D-5(1) state of Eu3+. Under a constant 358 nm excitation, the integrated emission intensity cor- responding to D-5(1) -> F-7(1) transition of Eu3+ exhibits drastic temperature dependence ranging from 300 to 480 K. A high relative sensitivity S-R was obtained to be 3923/T-2 . Temperature cycling tests were performed to evaluate the reusability and feasibility as temperature sensors. Our results indicate the potential use of the proposed strategy for high performance optical thermometry. (C) 2019 Elsevier B.V. All rights reserved.