Nanosized ZnS doped with different concentrations of Eu3+ were prepared andanalyzed by x-ray diffraction technique. The experimental results show that ZnS belongs to thecubic structure. From the photoluminescence (PL)...Nanosized ZnS doped with different concentrations of Eu3+ were prepared andanalyzed by x-ray diffraction technique. The experimental results show that ZnS belongs to thecubic structure. From the photoluminescence (PL) emission spectra, it can be seen that the ratioof the emission intensity of Eu3+ at 616 nm to that at 590 nm increases as the increasing of Eu3+.This phenomenon reveals that the site symmetry of Eu3+ reduces as the increasing of Eu3+.展开更多
The photochromism in CaS:Sm (from white to pink) was observed for the first time by exposing it to ultraviolet light. The experiments results show that the absorption intensity of Sm2+ in the range of 500 similar to 6...The photochromism in CaS:Sm (from white to pink) was observed for the first time by exposing it to ultraviolet light. The experiments results show that the absorption intensity of Sm2+ in the range of 500 similar to 600nm was strongly increased after irradiation. This reveals that there is the valence changing of Sm. If the sample was excited by visible light again, the pink color turned to white, indicating that CaS:Sm has potential application in the field of storage material.展开更多
文摘Nanosized ZnS doped with different concentrations of Eu3+ were prepared andanalyzed by x-ray diffraction technique. The experimental results show that ZnS belongs to thecubic structure. From the photoluminescence (PL) emission spectra, it can be seen that the ratioof the emission intensity of Eu3+ at 616 nm to that at 590 nm increases as the increasing of Eu3+.This phenomenon reveals that the site symmetry of Eu3+ reduces as the increasing of Eu3+.
文摘The photochromism in CaS:Sm (from white to pink) was observed for the first time by exposing it to ultraviolet light. The experiments results show that the absorption intensity of Sm2+ in the range of 500 similar to 600nm was strongly increased after irradiation. This reveals that there is the valence changing of Sm. If the sample was excited by visible light again, the pink color turned to white, indicating that CaS:Sm has potential application in the field of storage material.
