Abstract

In this paper, the green upconversion (UC) fluorescence emission from ${{\rm Er}^{3 +}}/{{\rm Yb}^{3 +}}/{{\rm Ho}^{3 +}}$ tri-doped tellurite glass is investigated for temperature sensing. The doping of ${{\rm Ho}^{3 +}}$ ions not only enhances the chance of energy level transition but also avoids the influence of the thermal effect caused by the proximity of ${}^2{{\rm H}_{11/2}}$ and ${}^4{{\rm S}_{3/2}}$ energy levels. The luminescence characteristics at different ${{\rm Yb}^{3 +}}$ and ${{\rm Ho}^{3 +}}$ ion concentration doping molar ratios were investigated, and the strongest luminescence characteristics were exhibited when the ${{\rm Yb}^{3 +}}$ ion concentration was at 5 mol% and ${{\rm Ho}^{3 +}}$ at 0.2 mol%. Based on this, a tri-doped ${{\rm TeO}_2} \text{-} {\rm ZnO} \text{-} {{\rm Bi}_2}{{\rm O}_3}$ (TZB) no-core fiber was fabricated and connected with multimode fibers (MMFs) to form a temperature sensor. The temperature sensing performance of the tri-doped TZB temperature sensor was evaluated in detail over the temperature range of 255–365 K. The repeatability and stability of the temperature sensor was experimentally verified. The ${{\rm Er}^{3 +}}/{{\rm Yb}^{3 +}}/{{\rm Ho}^{3 +}}$ tri-doped sensor can be used for noninvasive optical temperature sensing in the fields of environmental monitoring, biological sensing, and industrial process temperature control, etc.

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