The Na₅Y₉F₃₂ single crystals doped with fixed 0.5 mol% Ce³⁺ and various concentrations of Tb³⁺ (0, 0.4, 0.6 and 0.8 mol%) were grown by Bridgeman method. The luminescent properties, energy transfer (ET) and the ratiometric temperature sensing behavior were studied thoroughly. Under 315 nm excitation, the Ce³⁺/Tb³⁺ co-doped Na₅Y₉F₃₂ single crystal mainly presented two emissions at blue 385 nm (Ce³⁺:5d→4 f) and green 545 nm (Tb³⁺:⁵D₄→⁷F₅). The color area can undergo from the purple-blue region (0.1643, 0.0768) to the green region (0.2585, 0.3604) by altering the content of Tb³⁺ ion from 0 to 0.8 mol%. The energy transfer between the Ce³⁺ and Tb³⁺ ions was confirmed by decay curves with emission spectra, and the maximum energy transfer efficiency (ETE) were estimated to be 45.1%. The mechanism of dipole-dipole interaction (d-d) for energy transfer from Ce³⁺ to Tb³⁺ can be explained by the formula of Dexter’s energy transfer. The fluorescence intensity ratio (FIR) of blue and green emission showed a linear relationship with temperature varying from 298 K to 473 K in the 0.5 mol% Ce³⁺/0.8 mol% Tb³⁺ co-doped Na₅Y₉F₃₂ single crystal. Meanwhile, the 0.5 mol% Ce³⁺/0.8 mol% Tb³⁺ co-doped Na₅Y₉F₃₂ single crystal possessed higher absolute sensitivity (S_a) of 0.0157 K^-1, relative sensitivity (S_r) of 1.18% K^-1 and temperature resolution ($\delta T$) of 0.086 K. By using the integrating spheres, the quantum yield (QY) of 0.5 mol% Ce³⁺/0.8 mol% Tb³⁺ co-doped Na₅Y₉F₃₂ single crystal was measured as ~16.88%. These excellent optical properties suggest that the Ce³⁺/Tb³⁺ co-doped Na₅Y₉F₃₂ single crystal with stable physical-chemical properties could have a far-reaching application prospect for the ratiometric optical thermometry.

通过布里奇曼法生长掺有固定的0.5mol％的Ce ³⁺和各种浓度的Tb ³⁺（0、0.4、0.6和0.8mol ％）的Na ₅ Y ₉ F ₃₂单晶。深入研究了发光性质，能量转移（ET）和比例温度感测行为。在315 nm激发下，Ce ³⁺ / Tb ³⁺共掺杂Na ₅ Y ₉ F ₃₂单晶主要在蓝色385 nm（Ce ³⁺：5 d →4 f）和绿色545 nm（Tb ^{3 +}      ：⁵ D ₄ → ⁷ F ₅）。通过将Tb ³⁺离子的含量从0  mol％更改为0.8 mol％，可以使颜色区域从紫色蓝色区域（0.1643，0.0768）变为绿色区域（0.2585，0.3604）。Ce ³⁺和Tb ³⁺离子之间的能量转移通过发射光谱的衰减曲线确定，最大能量转移效率（ETE）估计为45.1％。能量从Ce ³⁺传递到Tb ³⁺的偶极-偶极相互作用（dd）的机理可以用德克斯特的能量转移公式来解释。在0.5 mol％Ce ³⁺ /0.8 mol％Tb ³⁺共掺杂的Na ₅ Y ₉ F ₃₂单晶中，蓝色和绿色发射的荧光强度比（FIR）与温度从298  K到473  K呈线性关系。水晶。同时，共掺杂的0.5 mol％Ce ³⁺ /0.8 mol％Tb ³⁺ Na ₅ Y ₉ F ₃₂单晶具有更高的绝对灵敏度（S _a），为0.0157 K ^-1，相对灵敏度（S _r）。     ）的1.18％K ^-1和温度分辨率（$\delta Ť$）为0.086K） 。通过使用积分球，测得 0.5mol％的Ce ³⁺ /0.8mol％的 Tb ³⁺共掺杂的Na ₅ Y ₉ F ₃₂单晶的量子产率（QY）为〜16.88 ％。这些优异的光学性质表明，具有稳定的物理化学性质的Ce ³⁺ / Tb ³⁺共掺杂的Na ₅ Y ₉ F ₃₂单晶可以为比率式光学测温法具有广阔的应用前景。