采用水热合成法制备了CaF2∶Yb3+,Er3+上转换纳米粒子。在980 nm激发下，研究了来源于Er3+的2H11/2/4S3/2→4I15/2跃迁的绿光发射和来源于4F9/2→4I15/2跃迁的红光发射。由于Er3+具有一对热耦合能级(2H11/2/4S3/2)，所合成的样品在293~573 K温度范围内有良好的温敏特性。利用荧光强度比(FIR)技术，测得样品在483 K时具有最大灵敏度0.002 85 K-1。

CaF2∶Yb3+,Er3+ upconversion nanoparticles (UCNPs) were synthesized by hydrothermal method. The green and red light from 2H11/2/4S3/2 → 4I15/2 and 4F9/2 → 4I15/2 of Er3+ were investigated in detail by using the power depended luminescence intensity under 980 nm excitation. Afterwards, the as-obtained sample was proved that it had good temperature sensing property in the range of 293-573 K based on thermal coupled levels (TCLs) of Er3+(2H11/2/4S3/2), simultaneously the maximum sensitivity of sample was obtained at 483 K (0.002 85 K-1) by utilizing fluorescence intensity ratio (FIR) technique. All the experiment data indicate that the sample has great luminescence property and excellent potential in temperature sensing.