Bi^(3+)掺杂对YVO_4:Yb^(3+)近红外发光的敏化作用  

Near-Infrared Luminescence Enhancement by Co-Doped Bi^(3+) in YVO_4:Yb^(3+)

作　　者：肖全兰[1] 孟建新[1,2] 谢丽娟[1] 张蕤[1] 

机构地区：[1]暨南大学化学系,广州510632 [2]暨南大学纳米化学研究所,广州510632

出　　处：《物理化学学报》2011年第10期2427-2431,共5页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(30670523);中央高校基本科研业务费专项资金资助项目~~

摘　　要：用主温固相法合成了Yb^(3+)、Bi^(3+)共掺的YVO_4,研究了Bi^(3+)的掺入对YVO_4:Yb^(3+)发光光谱的影响和近红外发光的敏化作用.X射线衍射图谱研究表明:掺入Yb^(3+)、Bi^(3+)之后,基质YVO_4的晶格结构没有发生明显变化.Bi^(3+)的掺入不仅显著增强了样品中Yb^(3+)的特征远红外发光强度,还使YVO_4:Yb^(3+)激发光谱的范围红移,当Bi^(3+)掺入的摩尔分数从0增加到0.05时,样品的最强激发峰位置从335nm红移至352 nm,激发光谱范围由300-360 nm扩宽至300-430 nm.优化的Bi^(3+)掺入量为0.03.初步讨论了VO_4^(3-),Bi^(3+)Yb^(3+)间的能量传递机理.结果表明Bi^(3-)的共掺使YVO_4:Yb^(3+)样品对长波紫外光的响应性能大大改善,作为一种基于量子剪裁的光谱转换材料,可以更好地匹配太阳光的能量谱,有助于提高硅太阳能电池的光电转换效率.The near-infrared （NIR） luminescence phosphor Yb3＋,Bi3＋ co-doped YVO4 was prepared by a conventional solid state method and the sensitization of Yb3 ＋ near-infrared luminescence by Bi3 ＋ was investigated. By co-doping with Bi3＋ from 0 to 0.05 the characteristic NIR luminescence of Yb3＋ in the YVO, matrix was greatly enhanced and the strongest site of the excitation wavelength red-shifted from 335 to 352 nm while the wavelength range of the excitation spectrum broadened from 300-360 to 300-430 nm. The optimized Bi3＋ content is 0.03. The possible energy transfer mechanism among VO4^3＋, Bi3＋, and Yb3＋ was discussed. We conclude that the NIR luminescence of YVO4：Yb3＋ can be remarkably improved by co-doping with Bi3＋ and its absorbance matches better with the solar energy spectrum. YVO4：Yb3＋, Bi3＋is a promising spectral converter for silicon solar cells and it is expected to improve the photoelectric conversion efficiency.

关 键 词：近红外发光 固相法 能量下转换 YVO_4:Yb^3+ Bi^3+ 

分 类 号：O614.32[理学—无机化学]