采用沉淀-燃烧法结合超声波技术合成了小颗粒Sr3(PO4)2∶Tb3+荧光粉, 测量了其光谱特性。在Sr3(PO4)2∶Tb3+体系中观察到Tb3+的特征发射, 峰值波长分别为489, 542, 584, 620 nm, 分别对应于Tb3+的5D4→7F6、5D4→7F5、5D4→7F4和5D4→7F3跃迁, 其中542 nm处的绿色发射最强。激发光谱由4f75d1宽带吸收(200~280 nm)和4f→4f电子跃迁吸收(280~390 nm和475~500 nm)组成, 可被近紫外发光二极管(NUV-LED)有效激发。采用R+(R=Li, Na, K)作为电荷补偿剂, 结果表明: Li+作为电荷补偿剂使样品发光强度提高了31％, Na+和K+的掺入则降低了粉体在近紫外区的吸收。

A green-emitting phosphor Sr3(PO4)2∶Tb3+,Li+ was prepared by a precipitation-combustion method combined with ultrasonic-disperse technology. Photoluminescence characteristics showed that the phosphor can be efficiently excited by N-UV(379 nm) light, exhibiting four sharp unattached emission peaks located at 489, 542, 584 and 620 nm, which originate from the typical 5D4→7Fj(j=6, 5, 4, 3) transition of Tb3+. R+(R=Li, Na, K) was introduced into Sr3(PO4)2∶Tb3+ as a charge compensator respectively. The results show that the incorporation of Li+ ions could induce a remarkable improvement of the emission intensity. The highest emission intensity was observed with the compound of 0.15Li+ co-doped Sr3(PO4)2∶Tb3+, whose brightness was increased by 31％ in comparison with that of the Sr3(PO4)2∶Tb3+. Compared with Sr3(PO4)2∶0.6Tb3+, the relatively lower emission intensity was observed when Na+/K+ was doped.