Abstract
Sr3SiO5:Eu2+ phosphors were synthesized by solid-state reactions, and their photoluminescence (PL) stability under the impact of heat or light was studied. The thermal degradation in air was observed for the Sr3SiO5:Eu2+ phosphor, furthermore, this drop in emission intensity could be accelerated by simultaneously illuminating the phosphor with a high-power blue LED during the heating process. This enhanced thermal degradation phenomenon in the blue light can be ascribed to the photo-assisted thermal oxidation of Eu2+ ions. A reversible decrease in emission intensity at room temperature was observed on illuminating the Sr3SiO5:Eu2+ phosphor alone by the blue light, which could be related to trapping centers in the phosphor. The existence of traps is also responsible for the anomalous increase of emission intensity with increasing temperature from 30 to 100°C. Considering the influences of Ba2+ doping on temperature-dependent PL properties of the Sr3SiO5:Eu2+ phosphor, the thermal quenching origin may be ascribed to the thermally assisted photoionization process.
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