Abstract:

Nano-sized Sr₂MgSi₂O₇: Eu²⁺,Dy³⁺ phosphor with long lasting behavior was synthesized by a sol-gel method. The chemical reaction process during calcination, and the luminescent property
of the obtained phosphor, were investigated in detail. The result indicated that the phosphor obtained by the sol-gel method, which showed photoluminescence and long lasting behavior, was consisted
of nano-sized grains about 50nm. The sol-gel-derived phosphor gave out a visible light upon UV illumination peaking at 465nm, while the phosphor obtained by solid reaction showed two emission peaks upon
UV irradiation at 404nm and 459nm respectively. The difference in emission spectra can be ascribed to the different coordinators formed within the silicate matrix. The phosphor synthesized by solid
reaction exhibited a better afterglow character than the phosphor obtained by the sol-gel method, due to a higher trap concentration which was formed by a higher reaction temperature.

Key words: silicate, luminescent material, long lasting, thermal stimulated luminescence