Herein, we reported novel Y₄GeO₈:Er³⁺,Yb³⁺ phosphors elaborated via conventional solid-state reaction, and we further explored their properties as optical thermometer by using fluorescence intensity ratio (FIR) method complemented by detailed analysis on crystal structure, up-conversion luminescence and energy transfer from Yb³⁺ to Er³⁺. Upon 980 nm laser excitation, Y₄GeO₈:Er³⁺,Yb³⁺ phosphors present 525, 547 and 659 nm emission bands assigned to the characteristic transitions of Er³⁺. Furthermore, Y₄GeO₈:Er³⁺,Yb³⁺ samples show outstanding temperature sensing performances. To be specific, the minimal temperature resolution is 0.03 K (303 K), and the relative sensitivity of FIR can be up to 1.152%/K (303 K). Hence, Y₄GeO₈:Er³⁺,Yb³⁺ phosphors can be possible candidates for thermometry devices.

在此，我们报道了通过常规固态反应制备的新型 Y ₄ GeO ₈ :Er ³⁺ ,Yb ³⁺荧光粉，并通过使用荧光强度比 (FIR) 方法进一步探索了它们作为光学温度计的性质，并辅以对晶体的详细分析。结构、上转换发光和从 Yb ³⁺到 Er ^{3+ 的}能量转移。在 980 nm 激光激发下，Y ₄ GeO ₈ :Er ³⁺、Yb ³⁺磷光体呈现 525、547 和 659 nm 发射带，这些发射带分配给 Er ³⁺的特征跃迁。此外，Y ₄ GeO ₈:Er ³⁺ ,Yb ³⁺样品显示出出色的温度传感性能。具体来说，最小温度分辨率为0.03 K（303 K），FIR的相对灵敏度可达1.152%/K（303 K）。因此，Y ₄ GeO ₈ :Er ³⁺ ,Yb ³⁺磷光体可能是测温装置的候选者。