Low Dimensional Effects on Luminescent Properties of CaWO4 : Tb Nanophosphor
Low Dimensional Effects on Luminescent Properties of CaWO4 : Tb Nanophosphor
复制标题
DOI：
10.1149/1.3309727
复制
发表时间：
2010-04
影响因子：
3.9
通讯作者：
Zhaofeng Wang;Yuhua Wang;Yezhou Li;Bitao Liu
中科院分区：
文献类型：
--
作者：
Zhaofeng Wang;Yuhua Wang;Yezhou Li;Bitao Liu
采用水热法合成了铽激活的钨酸钙（CaWo4：Tb）纳米荧光粉。结果表明，所合成的CaWO4：Tb颗粒呈球形，直径约为50 nm，与体相CaWO4：Tb相比具有明显的独特性质。由于量子尺寸效应，纳米晶的吸收曲线向短波方向移动了28 nm。在紫外光和真空紫外光照射下，纳米尺度样品的猝灭浓度和衰减时间都比体样品的猝灭浓度和衰减时间要长，这可能是由于共振能量转移的限制引起的.这一发现弥补了纳米荧光粉在发光强度上的不足，显示出纳米荧光粉具有重要的潜在应用价值。
Terbium-activated calcium tungstate (CaWo 4 :Tb) nanophosphors were synthesized by a hydrothermal method. The particles were proved to be spherelike, about 50 nm in diameter, which behaved in a conspicuously unique nature compared with bulk CaWO 4 :Tb. In virtue of the quantum size effect, the absorption curve of the nanocrystalline shifted 28 nm to the short wavelength. A higher quenching concentration and a longer decay time of the nanoscaled sample than those of the bulk were observed upon the irradiation of UV and vacuum UV light, and the phenomena could be induced by the limitation of resonant energy transfer. This observation could remedy the deficiency of nanophosphors in emission intensity and show that nanoscaled phosphor has important potential applications.