【摘要】 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489,542,584,620nm,分别对应于Tb3+的5 D4→7F6、5 D4→7F5、5 D4→7F4和5 D4→7F3跃迁,其中542nm处的绿色发射最强。激发光谱由4f75d1宽带吸收(200～280nm)和4f→4f电子跃迁吸收(280～390nm和475～500nm)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。更多还原

【Abstract】 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.更多还原