Color‐tunable emissions and multi‐mode optical thermometer in Mg 3 Gd 2 Ge 3 O 12 : Tb 3+ , Eu 3+ phosphors

作者：Jinping Bai, Jinsu Zhang, Bingye Zhang, Xizhen Zhang, Yongze Cao, Yichao Wang, Hongquan Yu, Xin Zhang, Kang Li, Baojiu Chen · 发表于：Journal of the American Ceramic Society · 年份：2025 · DOI：10.1111/jace.70011 · 被引用次数：4 · 研究领域：Luminescence Properties of Advanced Materials、Microwave Dielectric Ceramics Synthesis、Ferroelectric and Piezoelectric Materials

Abstract A series of Mg 3 Gd 2 Ge 3 O 12 phosphors co‐doped with Tb 3+ and Eu 3+ was produced using a solid‐state method. The phosphors doped solely with Tb 3+ have blue emission (383 nm) and green emission (544 nm), and the addition of Eu 3+ can produce red emission (610 nm). The transformation of green‐orange could be achieved by adjusting the doping amount of Eu 3+ because of the energy transfer (ET) from Tb 3+ to Eu 3+ . The ET process was attributed to dipole−dipole interaction. In addition, the emission intensities of three levels and the lifetimes of 5 D 3 decrease with increasing temperature, and color changes are produced. According to these interesting phenomena, an optical thermometer with different modes was designed utilizing the fluorescence intensity ratio (FIR) and the fluorescence lifetime (FL) model. The maximum values of relative sensitivity ( S r ) were found to be 1.24% K −1 at 494 K (FIR = I 383 /I 610 ), 0.43% K −1 at 423 K (FIR = I 544 /I 610 ), and 1.38% ms K −1 at 465 K (FL). The temperature sensing performance of the sample demonstrates good repeatability through cyclic testing. The above results demonstrate that Mg 3 Gd 2 Ge 3 O 12 : Tb 3+ , Eu 3+ samples are potential materials for visual optical temperature measurement.