Upconversion (UC) phosphors of β-BiNbO₄:Er³⁺/Yb³⁺ as temperature sensing materials were synthesized using the solid-state method. The structure was characterized by x-ray diffraction (XRD), revealing that all samples exhibited a single triclinic phase. Upon 980 nm laser excitation, the phosphors exhibited strong green emission and relatively weak red emission. Its possible luminescence mechanism is discussed based on the dependence of the UC emission spectra on the pump laser power. Finally, its temperature sensing properties were investigated using the temperature-dependent fluorescence intensity ratio (FIR) of two green emission bands originating from Er³⁺ ions. The thermal effect from laser irradiation and its influence on temperature sensing were also studied. Its absolute sensitivity S_A exhibited a smaller change above 300 K, and reached a maximum value of 5.5‰ K⁻¹ around 400 K. These results indicate that this type of qualified UC phosphor shows potential application in optical temperature sensors, especially at high temperature.

使用固态方法合成了作为温度传感材料的β- BiNbO ₄：Er ³⁺ / Yb ^3+的上转换（UC）荧光粉。通过X射线衍射（XRD）对结构进行了表征，表明所有样品均表现出单一三斜晶相。在980nm激光激发下，磷光体显示出强绿色发射和相对弱的红色发射。基于UC发射光谱对泵浦激光功率的依赖性，讨论了其可能的发光机理。最后，使用源自Er ³⁺的两个绿色发射带的温度依赖性荧光强度比（FIR），研究了其温度传感特性。离子。还研究了激光照射的热效应及其对温度感测的影响。其绝对灵敏度S _A在300 K以上呈现较小的变化，在400 K附近达到最大值5.5‰K ^-1。这些结果表明，这种合格的UC荧光粉在光学温度传感器中显示出潜在的应用，尤其是在高温下。