为研究稀土荧光特性与温度关系, 从典型稀土材料的能级结构出发, 根据激发态多能级间的玻尔兹曼热平衡分布理论, 对激发态能级的粒子数分布情况与温度关系进行研究.发现随着温度的上升稀土发光荧光寿命变短, 激发态高能级辐射荧光比例增大;而荧光强度由于受到非辐射跃迁系数和能量传递效率的双重影响将会呈现先上升后下降的变化.以钒磷酸钇铕Y(P,V)O4∶Eu3+荧光粉材料为例进行实验研究, 测量了95 K到510 K温度范围内Y(P,V)O4∶Eu3+荧光材料在395 nm紫外光激励下所发荧光的荧光寿命、荧光强度和荧光分支比随温度的变化规律, 实验结果与理论相符合.

In order to get the relationship between rare earth luminescence fluorescence characteristic parameters (including fluorescence lifetime, intensity and branching ratio) and temperature. The relationship between the particle number distribution of the excited levels and temperature was studied using the typical level structure of rare earth materials and the Boltzmann distribution of thermal equilibrium between the multiple level of excited state. It was found that with the increase of temperature, fluorescence life and branching ratio of high level in excited state are increase too. And the intensity of fluorescence will decrease after increase first due to the influence of non-radiation transition coefficient and energy transfer efficiency. Forwardly, a experiment was designed to measure the fluorescence characteristic parameter of Y(P,V)O4∶Eu3+, pumped at the wavelength of 395 nm, at different temperatures from 95 K to 510 K. The experimental results are in good agreement with the theory conclusion..