Luminescence of SrAl_2O_4: Eu~(2+), Dy~(3+) Ceramics Synthesized at Different Firing Condition

摘要

The green SrAl_2O_4:Eu~(2＋), Dy~(3＋) phosphor is a well-known persistent material for a wide region of applications such as lighting, traffic signs, interior decoration and medical application. Double activated SrAl_2O_4:Eu~(2＋), Dy~(3＋) with improved properties has been synthesized through solid state route at different firing atmospheres (reduction, vacuum, oxygen and CO_2 wet gas) and heating times (1 h to 8 h). At the beginning the powders were heat treated for 2 h with a heating rate of 10°C/min. The phosphor prepared at different firing atmospheres and heating times exhibited a different wavelength and intensity of PL spectra. The emission intensity becomes stronger as the heating times increases from 1 h to 4 h. The difference found from these spectra maxima is rationalized based on the presence of intermediate phases and also on the diffusion activities of activator and co-activator in the host matrices.