| Luminescent material has long been a hot research field because of its extensive application. As two of the high performance long after glow phosphors, Eu actived silicate phosphor, made by cheap and abundance raw material SiO2, has more chemical and thermal stability, lower sintering temperature and better consistent to ceramics than aluminate phosphor. It is doomed to have wide application in the near future.This paper investigate the impact of composition of Sr2MgSi2O7: Eu, Dy on its luminescent performance, study the relationship between content of Eu, Dy, B and afterglow capability, obtain a recipe used for high performance silicate phosphor. Factors influence afterglow time are also investigated, such as sintering time, sintering method, composition of raw material, diameter of phosphor powder. A blue silicate long afterglow powder is prepared by using solid reaction and H2 reduced method. It has better initial luminance and longer afterglow time, The initial luminance is 3.5 cd/m2 when the powder's diameter is 0.125 mm.The impact of composition on glaze performance are also investigated and a transparent frit with a sintering temperature of 1150-1200℃ was developed, which had suitable viscosity and excellent transparence. Prepare luminescent ceramic glaze by using this frit and silicate long afterglow powder to study the luminescent performance of phosphor in glaze. Silicate luminescence powder prepared by solid reaction method, can be used to produce luminescent ceramic glaze sintered at 1150℃. Glaze will lose its afterglow capability when the temperature exceed 1200℃.Combined sol-gel and combustion method, a new method to obtain silicate phosphor in lower temperature and shorter time has been developed. Measures used for improving the luminescent performance are also discussed.
|
PDF Full Text Request