采用熔盐法制备了不同煅烧温度的NaY(MoO4)2∶Er3+荧光粉材料, 样品的晶体结构与微观形貌由X射线衍射仪和场发射扫描电镜测得。Er3+掺杂的 NaY(MoO4)2 纳米晶体的斯托克斯荧光发射光谱是在不同煅烧温度下测得的。NaY(MoO4)2∶Er3+荧光粉材料的两个能级2H11/2-4I15/2 和 4S3/2-4I15/2跃迁的发射强度比随煅烧温度的增加而减小。NaY(MoO4)2∶Er3+荧光粉材料的温度传感特性依赖于Er3 的两个热耦合能级2H11/2-4I15/2 和 4S3/2-4I15/2 的发射强度。研究表明, 在一个相对大的传感温度范围(303～573 K), 600 ℃煅烧的样品的温度传感灵敏度比900 ℃煅烧的样品高, 样品的温度传感灵敏度随煅烧温度的增加而减小, 600 ℃煅烧的样品的温度传感灵敏度为 1.36×10-2 K-1 , 比900 ℃煅烧的样品高76.6%。最后, 解释了基于不同煅烧温度的温度传感灵敏度的物理机制。

The NaY(MoO4)2∶Er3+ phosphors derived at different calcination temperatures were prepared by molten salt method and the crystal structure and microscopic morphology were characterized by means of X-ray diffraction(XRD) and field emission scanning electron microscopy (FE-SEM). The Stokes fluorescence emission spectra of nanocrystals derived at different calcination temperatures have been measured. It can be found that the emission intensity ratio of 2H11/2-4I15/2 to 4S3/2-4I15/2 transitions from NaY(MoO4)2∶Er3+ increases with the decrease of the calcination temperature. Furthermore, the temperature sensing properties of NaY(MoO4)2∶Er3+ phosphors were studied based on the emission intensities from two thermally coupled 2H11/2 and 4S3/2 levels of Er3+ . The results show that the temperature sensing sensitivity of the sample calcinated at 600 ℃ is somewhat higher than that of the sample calcinated at 900 ℃in a relatively wide range of sensing temperature (303-573 K). The sensing sensitivity increases with the decreasing of the calcination temperature, and a relative high sensitivity of 1.36×10-2 K-1 is obtained for the sample calcinated at 600 ℃, which is about 76.6% higher than that of the sample obtained at 900 ℃. Finally, the physical mechanism for the calcination temperature-dependence of temperature sensing sensitivity was explained and predicted.