Bi3+掺杂对YVO4:Yb3+近红外发光的敏化作用

用主温固相法合成了Yb³⁺、Bi³⁺共掺的YVO₄,研究了Bi³⁺的掺入对YVO₄:Yb³⁺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Yb³⁺、Bi³⁺之后,基质YVO₄的晶格结构没有发生明显变化.Bi³⁺的掺入不仅显著增强了样品中Yb³⁺的特征远红外发光强度,还使YVO₄:Yb³⁺激发光谱的范围红移,当Bi³⁺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Bi³⁺掺入量为0.03.初步讨论了VO₄^3-,Bi³⁺Yb³⁺间的能量传递机理.结果表明Bi^3-的共掺使YVO₄:Yb³⁺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.

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

The near-infrared(NIR) luminescence phosphor Yb~(3+),Bi~(3+) co-doped YVO_4 was prepared by a conventional solid state method and the sensitization of Yb~(3+) near-infrared luminescence by Bi~(3+) was investigated.By co-doping with Bi~(3+) from 0 to 0.05 the characteristic NIR luminescence of Yb~(3+) in the YVO_4 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 300-43...