JIAO Zhiwei, HOU Zhengzheng, LIU Wei, ZHANG Tao, CAO Leigang, LI Sheng, GUO Yanxing
(North China University of Technology, Beijing 100144, China)
Abstract: Nd3+ doped spinel phase glass-ceramics were obtained through heat-treatment of their parent glass prepared by using melt quenching method. The relationship between the heat treatment conditions and optical properties of the glass-ceramics was studied. Differential thermal analysis (DTA), X-ray diffraction (XRD), UV-visible spectrophotometer and fluorescence spectrometer were utilized to characterize crystallization behavior of the glasses and optical properties of the glass-ceramics. It is confirmed that MgAl2O4 and ZnAl2O4 were precipitated in the parent glasses after heat treatment. With increasing crystallization time, the degree of crystallization of the glasses is increased first and then decreased, while the average crystals size is increased slowly. Ultraviolet-visible absorption and luminescence behaviors of the as-prepared glass-ceramics were studied, indicating that Nd3+ entered the spinel lattice. Over 800~1400 nm, three emission peaks are present, due to the energy level transitions of Nd3+. Luminous intensity of the glass-ceramics is increased as the degree of crystallization is increased. The sample after crystallization for 1.5 h shows the strongest fluorescence effect. At 1064 nm, the intensity of the emission peak is much higher than the other two emission peaks, indicating that it is a potential near-infrared fluorescent material.
Key words: glass-ceramics; spinel; Nd 3+ ; fluorescence