Investigation On Rare Earth Doped SrO-MgO-SiO₂Luminescent Glass Ceramics

Luminescent materials are GREEN MATTE which can save energy. In recent years luminescent materials are given attention by home and abroad scholars widely. Rare earth doped glasses are also given attention widely for the special4f electronic shell structure of rare earth ions. Glass ceramics, as the glass and crystal composites, has attracted strong interests for their excellent luminescent properties, machinability, high uniformity and stability.Glass forming properties and devitrification properties of SrO-MgO-SiO2system were studied in this paper. Sm3+,Tb3+,Ce3+doped SrO-MgO-SiO2luminescent glass ceramics were prepared and studied in this paper. X-ray Diffraetion (XRD) and scanning electron microscope (SEM) were availed to measure the crystalline phase and microstrueture of the glass ceramics to find the proper nucleation agent and heat treatment. XRD also can judge glass forming situation of SrO-MgO-SiO2system. Differential thermal analysis (DTA) were availed to judge devitrification behavior of glass. DTA results can choose appropriate nucleating agent and heat treatment to obtain glass ceramics with fine devitrification behavior. Jasco FP-6500fluorescence spectrometer was used to get the emission and excitation spectra of samples. The effects of heat treatment, concentration of rare earth were discussed. The results indicate:1. The glass forming region of SrO-MgO-SiO2system (melting temperature:1500℃, keeping warm time:2h,15g glass liquid) approximately focus on the region:SiO2:50-60mol%, SrO:10-50mol%, MgO:0-40mol%. The increasing of SiO2relative content could lead to the increasing of Tp. When SiO2content was increased glass structure was stabilized, which is difficult to devitrify. When SiO2content is fixed and Mg/Sr was increased, glass structure was stabilized, which is difficult to devitrify.2. Different nucleating agent could not change the crystalline phase of SrO-MgO-SiO2glass, but it could bring more crystalline phase. The crystal content of glass ceramic increased as heat treatment temperature increasing. Rear earth ion could not change crystalline phase, but it bring puniness change of crystal lattice in glass ceramic.3. Sm3+doped glass ceramics can emit red light under the excitation of404nm purple light. The glass ceramics show emission with peaks at360nm,374nm,404nm,417nm,475nm. The luminescence intensity is increased with the inereasing of the heat treatment temperature. The luminescence intensity is increased with the inereasing of the Sm3+content. And concentration quenching effect was observed during experiment process (0.05mol%-0.30mol%).4. Tb3+doped glass ceramics can emit green light under the excitation of485nm blue light. The glass ceramics show emission with peaks at350nm,375nm,485nm. The luminescence intensity is increased with the inereasing of the heat treatment temperature. The luminescence intensity is increased with the inereasing of the Tb3+content. And concentration quenching effect was not observed during experiment process (0.05mol%-0.20mol%).5. Ce3+doped glass ceramics can emit red light under the excitation of475nm blue light. The luminescent of the glass ceramics due to transition5d-4f of Ce3+. The luminescence intensity is increased with the inereasing of the heat treatment temperature. The luminescence intensity is increased with the inereasing of the Ce3+content. And concentration quenching effect was observed during experiment process (0.05mol%-0.15mol%).