采用高温固相法合成了Y2 WO6:Nd3 +/yb3及Y2 WO6:Nd3 +/yb3,Bi3+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Bi3的掺人对其近红外发光的敏化作用.Bi3的掺人不仅显著增强了样品中Nd3 +/yb3+的特征近红外发光强度,还使Y2 WO6:Nd3 +/yb3的激发光谱红移.随着Nd3 +/yb3浓度的升高,Bi3的荧光寿命逐渐变短,表明样品中存在Bi3+到Nd3 +/yb3+的能量转移.Nd3+和yb3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Bi3+到Nd3 +/yb3+的能量传递为电偶极矩-电偶极矩相互作用.因此,Y2WO6:Nd3 +/yb3+,Bi3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 Nd3+/yb3+,Bi3+ co-doped Y2WO6 was synthesized by solid-state reaction.The crystal structure,photoluminescence properties,fluorescence lifetime and the sensitization of Nd3 +/Yb3 + nearinfrared luminescence by Bi3 + were investigated.By introducing Bi3+,the characteristic peak of Nd3+/Yb3+ in Y2WO6 matrix was enhanced tremendously and the peak wavelength red-shifted.With the rise of Nd3+/Yb3+ concentration,fluorescence lifetime of Bi3 + gradually decreased which proved the occurrence of energy transfer from Bi3+ to Nd3+/yb3+.The energy transfer efficiency from Bi3+ to Nd3+/yb3+ were calculated to 85％ and 88％ respectively while the concentration of Nd3+/yb3+ was 9％.Based on Inokuti-Hirayama(I-H) model,the energy transfer type from Bi3 + to Nd3 +/Yb3+ is supposed to be electric dipole-dipole interaction.This work suggested that Y2WO6:Nd3+/Yb3+,Bi3 + might be a promising ultraviolet-absorbing luminescent converter to enhance the photoelectric conversion efficiency of silicon solar cells.
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