A series of Tb^3＋ mono-doped and Ce^3＋-Tb^3＋ co-doped Sr3Gd2（Si3O9）2 phosphors with high thermal stability and quantum yields were successfully prepared via the solid state reaction. The as-prepared Sr3Gd2（Si3O9...A series of Tb^3＋ mono-doped and Ce^3＋-Tb^3＋ co-doped Sr3Gd2（Si3O9）2 phosphors with high thermal stability and quantum yields were successfully prepared via the solid state reaction. The as-prepared Sr3Gd2（Si3O9）2：Tb^3＋ samples showed broad excitation spectrum from 250 to 400 nm and presented characteristic emission transitions ^5D4→^7FJ（J=6, 5, 4, 3） of Tb^3＋ under 313 nm excitation, which were located at about 488, 541, 584 and 620 nm. The emission intensities of Tb^3＋ rose steadily in Sr3Gd2（Si3O9）2 host with the increase of Tb^3＋ concentration even though Gd^3＋ ions were completely replaced by Tb^3＋ ions. The Ce^3＋ ion as a sensitizer could efficiently improve the performance of Tb^3＋ ion. First, with Ce^3＋ co-doping, the excitation spectrum of Tb^3＋ monitored at 541 nm showed a similar band that responds to the violet emission of Ce^3＋ monitored at 416 nm. Second, the quantum yields of Sr3Gd2（Si3O9）2：Tb^3＋ phosphors could be enhanced from 26.6% to 80.2% by co-doping Ce^3＋. Finally, the co-doping of Ce^3＋ was also effective to improve the thermal stability of Sr3Gd2（Si3O9）2：Tb^3＋. As the temperature rose to 150 oC, the emission intensity of Tb^3＋ remained at about 83.6% of that measured at room temperature, which was better than the commercial YAG：Ce phosphor in terms of their thermal quenching properties. These results indicated that the as-prepared Sr3Gd2（Si3O9）2：Tb^3＋,Ce^3＋ samples could be used as green emission phosphors for possible applications in near ultraviolet based WLEDs.展开更多
基金Project supported by National Natural Science Foundation of China(21571162)the Guangdong Province Enterprise-University-Academy Collaborative Project(2012B091100474)
文摘A series of Tb^3＋ mono-doped and Ce^3＋-Tb^3＋ co-doped Sr3Gd2（Si3O9）2 phosphors with high thermal stability and quantum yields were successfully prepared via the solid state reaction. The as-prepared Sr3Gd2（Si3O9）2：Tb^3＋ samples showed broad excitation spectrum from 250 to 400 nm and presented characteristic emission transitions ^5D4→^7FJ（J=6, 5, 4, 3） of Tb^3＋ under 313 nm excitation, which were located at about 488, 541, 584 and 620 nm. The emission intensities of Tb^3＋ rose steadily in Sr3Gd2（Si3O9）2 host with the increase of Tb^3＋ concentration even though Gd^3＋ ions were completely replaced by Tb^3＋ ions. The Ce^3＋ ion as a sensitizer could efficiently improve the performance of Tb^3＋ ion. First, with Ce^3＋ co-doping, the excitation spectrum of Tb^3＋ monitored at 541 nm showed a similar band that responds to the violet emission of Ce^3＋ monitored at 416 nm. Second, the quantum yields of Sr3Gd2（Si3O9）2：Tb^3＋ phosphors could be enhanced from 26.6% to 80.2% by co-doping Ce^3＋. Finally, the co-doping of Ce^3＋ was also effective to improve the thermal stability of Sr3Gd2（Si3O9）2：Tb^3＋. As the temperature rose to 150 oC, the emission intensity of Tb^3＋ remained at about 83.6% of that measured at room temperature, which was better than the commercial YAG：Ce phosphor in terms of their thermal quenching properties. These results indicated that the as-prepared Sr3Gd2（Si3O9）2：Tb^3＋,Ce^3＋ samples could be used as green emission phosphors for possible applications in near ultraviolet based WLEDs.
