Novel Tb3+ And Eu3+ Co-Doped Dual-Emitting Phosphate K3srbi(P2o7)2 Phosphor for Application in Fir Thermometer

Abstract

The rare earth co-doped phosphor for fluorescence intensity ratio (FIR) thermometer has gained increasing attention in recent years. Herein, the Tb 3+ and Eu 3+ co-doped K 3 SrBi(P 2 O 7 ) 2 (KSBP) phosphate phosphors were reported for the first time. The crystal structure of the title phosphor was determined using Rietveld refinement and proved to be a three-dimensional structure. Tb 3+ →Eu 3+ energy transfer with a rather low efficiency was observed via time-resolved spectroscopy. More importantly, Tb 3+ and Eu 3+ emissions show different thermal quenching characteristics, claiming the potential of this material for application in optical thermometer. The FIR of the typical KSBP: 0.02Tb 3+ ,0.04Eu 3+ sample demonstrates a polynomial relationship as a function of temperature, and the absolute and relative sensitivity were 0.025 K -1 and 0.59% K -1 , respectively. Our study provides a novel and potential KSBP: Tb 3+ , Eu 3+ phosphate phosphor, which is expected but not limited to be used in high-sensitive FIR thermometer.

Keywords: phosphor, thermometer, FIR, thermal stability, rare earth