Preparation And Luminescent Properties Of Phosphor-doped Luminescent Glass

Luminescent glass is widely used in building, energy saving, emergency lighting and art crafts; The energy consumption for global illumination is rising year by year, and the energy consumption has become a global problem; the research of luminescent glass is important for the developing of the energy-saving light. However, white LED encapsulated by resin basically put in the following problem:resin aging, brightness down, color shifting and service life abbreviated. Glasses have advantages: homogeneous, transparent, corrosion resisting and easy formation. So glasses become good host materials. It is significant in theory and application to study the luminescent properties of phosphor-doped glass.In this paper, the glasses of the P2Os-ZnO-B2O3system were doped with yttrium aluminum garnet crystals containing Ce (YAG:Ce phosphors) and then were mixed and sintered for the preparation of the luminescent glass. Using X-ray diffraction, infrared spectra and fluorescence spectrometer, the effects of YAG:Ce phosphors content, boron trioxide content, sintering temperature and shaping method on structure and luminescent properties were studied. The results show that:1. The influencing factors of the structure of the phosphor-doped luminescent glass:a. Infrared spectra show that with an increasing B2O3content, the content of BO3groups became more and BO4become less. The groups of bridging oxygen had been exhausted and the contents of BO3increase sharply with the B2O3of over15mol%.b. From the results of X-ray diffraction analysis, it could be seen that three phases of YAG, Zn2P2O7and BPO4were identified. As the doping quantity of YAG:Ce phosphors increase, the amount of YAG phases increase too, the amount of Zn2P2O7and BPO4phases were not change much.c. As the sintering temperature increase, the amount of YAG phases were not change much and the amount of BPO4phases decrease. When the sintering temperature increased from550℃to600℃, Zn2P2O7crystallization changed. 2. The luminescent glasses excited at468nm glow yellow at554nm. From the Orthogonal test it could be seen that the emission intensities of the luminescent glasses range from1081-4577a.u. The results show that from high to low influencing factor of the emission intensity were YAG:Ce phosphors content, shaping method, sintering temperature and sintering atmosphere.3. As the doping quantity of YAG:Ce phosphors increase, the emission intensities increased first and then decreased, the transmission decreased. The emission intensities and transmission increased first and then decreased with the contents of B2O3increasing. The emission intensities and transmission were the highest at12mol%, the transmission is84%.4. As the sintering temperature increase, the emission intensities decreased the transmission increased, the emission intensity of the glass sintered at940℃was2393. The transmission of the glass sintered at1000℃was86%.5. The optimum parameter that were produced by the sintering of host glass(98%) and YAG:Ce phosphors (2%) at950℃for1h. The emission intensity is2865and the transmission is84%at12mol%of B2O3.6. The chemical stability of glass was studied according to the national standards GB/T171129-1997(Colorless optical glass test methods of chemical stability-Powder). The water resistance is in the third category, and the acidity-resistivity is in the third category, too.