Thermometric properties of Na <sub>2</sub>Y <sub>2</sub>TeB <sub>2</sub>O <sub>10</sub>:Tb <sup>3+</sup> green phosphor based on fluorescence/excitation intensity ratio
Yuefei Xiang, Lin Yang, Canyuan Liao, Xianfeng Xiang, Xiangkai Tang, Hanlin Tang, Jing Zhu
Abstract
For noncontact optical thermometry, in contrast with fluorescence intensity ratio (FIR) technology, excitation intensity ratio (EIR) technology has been seriously limited due to low sensitivity. Moreover, by exploring all possible temperature-dependent response, developing multimode optical thermometry is of great importance. In this work, a new Na<sub>2</sub>Y<sub>2</sub>TeB<sub>2</sub>O<sub>10</sub> (NYTB):Tb<sup>3+</sup> phosphor is obtained by a solid-state reaction. Based on FIR and EIR models of Tb<sup>3+</sup>, thermometric properties are studied thoroughly. Excellent relative and absolute sensitivity (<i>S</i><sub>R</sub> and <i>S</i><sub>A</sub>) are acquired due to the significant difference in emission/excitation lines in response to temperature. Meanwhile, Tb<sup>3+</sup> content-dependent luminescence quenching mechanism is discussed. This study shows a feasible route for exploiting well-performing FIR-/EIR-based thermometric materials.