Compared with the forbidden 4f transition of rare earth ions, the strong absorption of the charge transfer band (CTB) enabled fluorescence thermometry to have high luminescence efficiency. Based on the temperature induced redshift of CTB, a high performance fluorescence intensity ratio (FIR) thermometry performed by dual-wavelength alternative excitation was studied. By way of the rising and falling edges of CTB in ${\rm{E}}{{\rm{u}}^{{\textbf{3}} +}}$ doped ${{\rm{YVO}}_{\textbf{4}}}$, monochrome sensitivity as a function of excitation wavelength was studied in the range of 303–783 K. The excitation wavelength with the highest positive monochrome sensitivity was determined, as well as that with the negative one. The optimum FIR temperature sensing strategy is proposed, and the theoretical highest relative sensitivity (${{\textbf{S}}_r}$) is calculated to be 1.86% ${{\rm{K}}^{- 1}}$, with the lowest uncertainty ($\Delta T$) of 0.1 K at 783 K.

中文翻译：

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基于 Eu3+:YVO4 双波长交替激发 CTB 红移的高性能 FIR 测温

与稀土离子的禁区4f跃迁相比，电荷转移带（CTB）的强吸收使荧光测温法具有较高的发光效率。基于CTB的温度诱导红移，研究了双波长交替激发进行的高性能荧光强度比（FIR）测温。通过 CTB 的上升沿和下降沿在${\rm{E}}{{\rm{u}}^{{\textbf{3}} +}}$掺杂${{\rm{YVO}} _{\textbf{4}}}$, 单色灵敏度作为激发波长的函数在 303-783 K 范围内进行了研究。确定了具有最高正单色灵敏度的激发波长以及负单色灵敏度的激发波长。提出最优FIR温度传感策略，计算出理论最高相对灵敏度（${{\textbf{S}}_r}$）为1.86% ${{\rm{K}}^{- 1}} $，最低不确定性 ( $\Delta T$ ) 为 0.1 K，为 783 K。