Bi^(3+)掺杂对Y_2WO_6:Nd^(3+)/Yb^(3+)的近红外发光的敏化  

Near-Infrared Luminescence Enhancement by Co-doped Bi^(3+) in Y_2WO_6:Nd^(3+)/Yb^(3+)

作　　者：王婷[1] 林静芸 汪文青 吴轩民 曹丽伟[1] 孟建新[1] Wang Ting Lin Jingyun Wang Wenqing Wu Xuanmin Cao Liwei Meng Jianxin(Department of Chemistry, Jinan University, Guangzhou 510623, China)

机构地区：[1]暨南大学化学系,广东广州510632

出　　处：《中国稀土学报》2017年第3期322-328,共7页Journal of the Chinese Society of Rare Earths

基　　金：广东省自然科学基金研究团队项目(S2013030012842)资助

摘　　要：采用高温固相法合成了Y_2WO_6:Nd^(3+)/Yb^(3+)及Y_2WO_6:Nd^(3+)/Yb^(3+),Bi^(3+)系列近红外发光材料,研究了其晶体结构、发光性能、荧光寿命,并讨论了Bi^(3+)的掺入对其近红外发光的敏化作用。Bi^(3+)的掺入不仅显著增强了样品中Nd^(3+)/Yb^(3+)的特征近红外发光强度,还使Y_2WO_6:Nd^(3+)/Yb^(3+)的激发光谱红移。随着Nd^(3+)/Yb^(3+)浓度的升高,Bi^(3+)的荧光寿命逐渐变短,表明样品中存在Bi^(3+)到Nd^(3+)/Yb^(3+)的能量转移。Nd^(3+)和Yb^(3+)的浓度为9%时,能量传递效率分别为85%,88%。根据Inokuti-Hirayama(I-H)理论模型分析表明Bi^(3+)到Nd^(3+)/Yb^(3+)的能量传递为电偶极矩-电偶极矩相互作用。因此,Y_2WO_6:Nd^(3+)/Yb^(3+),Bi^(3+)可作为一种光谱转换材料,有望提高硅太阳能电池的光电转换效率。Near-infrared phosphors Nd^3＋/yb^3＋, Bi^3＋ co-doped Y2WO6 was synthesized by solid-state reaction. The crystal structure, photoluminescence properties, fluorescence lifetime and the sensitization of Nd^3＋/Yb^3＋ near-infi-ared luminescence by Bi3＋ were investigated. By introducing Bi^3＋ , the characteristic peak of Nd^3＋/Yb^3＋ in Y2WO6 matrix was enhanced tremendously and the peak wavelength red-shifted. With the rise of Nd^3＋/Yb^3＋ concentration, fluorescence lifetime of Bi^3＋ gradually decreased which proved the occurrence of energy transfer from Bi^3＋ to Nd^3＋/Yb^3＋ The energy transfer efficiency from Bi^3＋ to Nd^3＋/yb^3＋ were calculated to 85% and 88% re- spectively while the concentration of Nd^3＋/yb^3＋ was 9%. Based on Inokuti-Hirayama（I-H） model, the energy transfer type from Bi^3＋ to Nd^3＋/Yb^3＋ is supposed to be electric dipole-dipole interaction. This work suggested that Y2WO6 ：Nd^3 ＋/Yb^3＋, Bi^3＋ might be a promising ultraviolet-absorbing luminescent converter to enhance the photoe-lectric conversion efficiency of silicon solar cells.

关 键 词：稀土离子 钨酸盐 近红外发光 能量传递 硅太阳能电池 

分 类 号：O482.31[理学—固体物理]