Enhanced Sensitivity for Tm³⁺/Er³⁺‐Based Thermometer Through Dual‐Wavelength Excitation

Abstract

How to design the ratiometric thermometer with high sensitivity is a monumental challenge. If the sensitivity can be superposed like the stack of toy bricks, the temperature‐sensing performances will be significantly improved. To achieve sensitivity superposition, a method of dual‐wavelength (980 and 379 nm) excitation in consideration of the sensitivity of integral form is designed and the sensitivity is expected to be manipulated. Herein, compared with conventional 980 nm single excitation, the increase in Er3+ luminescence with dual‐wavelength excitation is attributed to its downshifting luminescence. Under multiple exciting methods (980, 379 nm, and dual‐wavelength excitation), temperature‐sensing behaviors based on thermally (TCL) and nonthermally (NTCL) coupled levels are investigated in the range of 213–683 K. The maximum of relative sensitivity is 2.19% K−1 (based on NTCL) with dual‐wavelength excitation, which is higher than that both with 980 nm single excitation and based on conventional TCL. These results reveal that this dual‐wavelength excitation strategy is effective to enhance sensitivity for Tm3+/Er3+‐based thermometer, which provide new insights into the design of ratiometric thermometer with high sensitivity.

Molten Salt Synthesis and Upconversion of Cubic ZrO2 Submicron Phosphors for Temperature Sensor and Anticounterfeit Applications

“…Furthermore, the fluorescence intensity ratio (FIR) of these two emission bands shows an obvious dependence on the temperature (Figure d). Generally, owing to the nonthermally coupled level, the FIR can be easily deduced on the basis of the polynomial equation − F I R = A + italicBT + C T 2 + D T 3 where A , B , C , and D are constants. This expression fitted well to the experimental data, yielding the following: R = 10.2594 – 3.574 × 10 –2 T + 4.4735 × 10 –5 T 2 – 1.8862 × 10 –8 T 3 .…”

Dual-mode up/down-conversion optical thermometry of Pr³⁺-regulated Li_0.9K_0.1NbO₃:Er³⁺ phosphors

“…通过本文的光学测温材 料与先前报道关于Er 3+ 光学测温材料(表1)的S a 和S r 值 [36][37][38] 进行比较, Li 0.9 K 0. 的测温材料 [25] . 因此对于优化后的Li 0.9 K 0.1 NbO 3 :…”