Optical thermometry using fluorescence intensities multi-ratios in NaGdTiO_4:Yb~(3+)/Tm~(3+) phosphors

摘要

The NaGdTiO4:Yb3+/Tm3+ phosphor has been effectively synthesized by the traditional solid-state reaction method and its down-conversion and up-conversion luminescence properties were systematically studied. The results indicate that the electric dipole-dipole interaction is the main mechanism for the luminescence quenching. The fact that the ratios of the up-conversion intensities, i.e., I-795nm/I-798nm, I-807nm/I-798nm, and I-812nm/I-798nm, increase linearly with temperature (100 K-300 K) provides us a simple and accurate temperature measurement method. Multi-ratios can be more accurate than using only one ratio, allowing for self-referenced temperature determination. It's promising for NaGdTiO4:Yb3+/Tm3+ to be used for optical temperature sensors. (C) 2018 Elsevier B.V. All rights reserved.