A novel Bi3+,Eu3+ co-doped Ca3Zr2SiGa2O12 phosphors for high-sensitive temperature measurement

Abstract

High-sensitive optical thermometers have garnered significant attention due to rapid technological advances. Here, novel Bi3+,Eu3+ co-doped Ca3Zr2SiGa2O12 (CZSG) phosphors with high temperature sensitivity were synthesized. Extensive researches of structure, photoluminescence and mechanism of energy transfer from Bi3+ to Eu3+ in CZSG:Bi3+,Eu3+ were carried out. Under excitation of 291 nm light, a broadband at 310–400 nm from Bi3+ ions as well as peaks at 580–710 nm from Eu3+ ions are both observed in CZSG:Bi3+,Eu3+. Fluorescence intensity (FI) of Bi3+ and fluorescence intensity ratio (FIR) of Bi3+ and Eu3+ were used to design dual-mode optical thermometer. The maximal relative sensitivities (SR) are 2.98 %K−1 @ 573 K (FI) and 1.88 %K−1 @ 303 K (FIR), respectively. Noticeably, when two modes are combined, the minimal SR of CZSG:Bi3+,Eu3+ is higher than 1.04 %K−1 over the whole temperature range (303–573 K). Above results indicate the potential application of CZSG:Bi3+,Eu3+ sample in optical thermometers.