Preparation And Characterization Of Rare Earth Doped CAS System Glass-Ceramics

Rare earth doped glasses are considered to be one of the promising materials for fiber amplifiers, lasers, fluorescent devices and white light emitting diode(LED). For the past decades, a large amount of luminescence research has focused mainly on two aspects. One is crystal matrix, another is non-crystalline matrix. But the poor stability of crystal and the weak luminescence properties of glass limited their further application for the optical devices. Glass ceramic, as the glass and crystal composites, has attracted strong interests for their excellent luminescence properties machinability, high uniformity and stability.This thesis presented that a study on preparation and characteristic of rare earth doped CAS system glass-ceramics. The crystallization heat-treated schedules were based on DSC results. According to X-ray Diffraction(XRD) analysis, the main phaseβ-CaSiO₃ was decided. Scanning electron microscope(SEM) were availed to measure the crystalline phase and microstructure of the glass ceramics and calculated the gain size. The optical transmittances of the glass and glass-ceramics were measured by UV-Vis-NIR spectrophotometer. With the increase of crystallization heat-treated temperature, the optical transmittances decreamed, even lost transparency. HORIBA FL3—211 fluorescence spectrometer was used to get the emission and excitation spectra of samples.Nd³⁺, Sm³⁺, Tb³⁺ doped CAS transparency glass-ceramics were preparation by metling-crystallization method. The concentration of heat-treated schedules that influence the microstructure of sample, the main phase is same in samples. With the difference of crystallization heat-treated temperature, the optical transmittances and fluorescence spectrometer had been changed.