NaY(MoO_4)_2∶Er~(3+)纳米晶体荧光粉的发光与光学温度传感特性(英文)

采用熔盐法制备了不同煅烧温度的NaY(MoO_4)_2∶Er~(3+)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。Er~(3+)掺杂的Na Y(MoO_4)_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(MoO_4)_2∶Er~(3+)荧光粉材料的两个能级~2H_(11/2)-~4I_(15/2)和~4S_(3/2)-~4I_(15/2)跃迁的发射强度比随煅烧温度的增加而减小。NaY(MoO_4)_2∶Er~(3+)荧光粉材料的温度传感特性依赖于Er~3的两个热耦合能级~2H_(11/2)-~4I_(15/2)和~4S_(3/2)-~4I_(15/2)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。

Luminescence and Optical Temperature Sensing Properties of NaY( MoO4 ) 2:Er3+ Nanocrystalline Phosphor

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 in-tensity ratio of 2 H11/2-4 I15/2 to 4 S3/2-4 I15/2 transitions from NaY( MoO4 ) 2:Er3+increases with the decrease of the calci-nation temperature. Furthermore, the temperature sensing properties of NaY ( MoO4 ) 2:Er3+phosphors were studied based on the emission intensities from two thermally coupled 2 H11/2 and 4 S3/2 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 calcinat-ed 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.