Dy^(3+)掺杂硼酸盐玻璃的制备、表征及发光特性

Preparation,Characterization and Luminescence Properties of Dy^(3+) Doped Borate Glasses

采用高温熔融-冷却法制备了一系列Dy^(3+)掺杂的B_2O_3-ZnO-Na_2O-Al_2O_3发光玻璃,通过红外光谱、紫外-可见-近红外光谱和荧光光谱等研究了其结构及发光特性。分析表明:制备的发光玻璃中出现基质组分的结构特征峰及Dy^(3+)的能级跃迁特征峰。在350 nm波长光激发下,样品的发光强度、黄蓝发射峰比、荧光寿命、色坐标及色温等均随Dy^(3+)浓度的变化发生明显的可调节变化。样品的荧光发射强度随Dy^(3+)浓度的增加呈现先增大后减小的变化,当Dy^(3+)掺杂摩尔分数为1.0%时,发光强度最大。此外,随着Dy^(3+)掺杂浓度的增大,发光玻璃的荧光寿命及发射光谱的色度坐标值、色温都呈现递减的趋势。这表明通过基质组分及掺杂元素的调节可以使得该硼酸盐体系发光玻璃获得高效可调节的光功能从而得到广泛应用。

A series of Dy（3＋）doped B_2O_3-ZnO-Na_2O-Al_2O_3 glasses（ BZNA∶ x Dy） were prepared by high temperature melting method. The structure,composition and luminescence property of BZNA∶x Dy samples were characterized through FTIR,UV-Vis-NIR and fluorescence spectra. The absorption spectra showed the characteristics peaks of glass substrate and the energy level transition of Dy（3＋）. Under 350 nm excitation,the luminescence intensity,ratio of yellow and blue emission peaks,fluorescence lifetime,color coordinate and color temperature of BZNA∶ x Dy samples can be adjusted and changed according to the content of Dy（3＋）. The luminescent intensity of Dy（3＋）doped samples are observed to be enhanced firstly and then decrease after 1. 0% of Dy（3＋）mole fraction.Thus,the concentration quenching of Dy occurs in the samples. Meanwhile,the fluorescence lifetime of samples decreases with the increasing doping concentration of rare earth ions. Furthermore,the chromaticity coordinates values and the color temperatures of the emission are reduced gradually.