Tb^(3+),Eu^(3+)共掺NaGd(MoO_4)_2荧光粉的温度传感性质

Temperature Sensing Properties of Tb^(3+),Eu^(3+) Co-doped NaGd(MoO_4)_2 Phoshor

利用水热法制备了NaGd(MoO4)2:5%Tb^(3+),0. 3%Eu^(3+)荧光粉,通过XRD和电镜图像表征了样品的结构和形貌.为了探究其温度传感性质,测量了样品室温下的激发光谱和发射光谱,以及样品的变温发射光谱,并发现Eu^(3+)(5D0-7F2)与Tb^(3+)(5D4-7F5)的发光强度比(FIR)随温度变化有明显变化,可以用来表征温度.通过FIR计算了样品的温度传感灵敏度,并且发现温度传感灵敏度会随着温度的升高而升高,在503 K时有最大值为0. 077 K-1.此外,利用发射光谱计算了样品的CIE色坐标,通过观察样品的色坐标,发现发光颜色随温度的升高从绿色到红色发生连续的变化,可以直观的表征温度.

NaGd(MoO4)2: 5% Tb3+,0. 3% Eu3+phosphors are prepared by hydrothermal method. The temperature-dependent emission spectra of samples have been measured. The results show that the fluorescence intensity ratio(FIR) of Eu3+to Tb3+is obviously changed with the temperature change. The temperature sensing sensitivity of the sample will increase with the increase of temperature. The maximum value of sensitivity achieves 0. 077 at 503 K. By observing the CIE(Commission International del ’Eclairage) chromaticity coordinates of the samples luminescence,it can be seen that with the increase of temperature(the temperature raised from 303 K to 503 K),the color of luminescence of samples shifted towards the red region,it can be used more intuitively to characterize temperature.