Li_2SrSiO_4:Eu^(2+),Nd^(3+)中Eu^(2+)和Nd^(3+)的光谱性质和能量传递

Spectroscopic Properties and Energy Transfer of Eu^(2+)/Nd^(3+) Co-Doped Li_2SrSiO_4

在还原气氛下采用高温固相法制备了Li2SrSiO4:Eu2+,Nd3+发光材料,测量了它们的可见和近红外激发光谱和发射光谱及Eu2+的荧光寿命,研究了Eu2+和Nd3+掺入对其发光性质的影响。结果表明,当Eu2+的浓度为0.01,Nd3+的浓度为0.05时,样品的近红外发光强度最强;Eu2+的发射光谱和Nd3+激发光谱之间的光谱交叠范围较大,Eu2+和Nd3+之间存在着高效无辐射能量传递,能量传递效率约为55.7%,Eu2+的掺入可显著地敏化Nd3+的近红外发光。

Li2SrSiO4：Eu2＋,Nd3＋ was synthesized by solid state synthesis method in reducing atmosphere.The VIS-NIR excitation and emission spectra were measured.The results showed that the NIR-emission of Nd3＋ could be greatly enhanced by co-doping of Eu2＋,and the maximum NIR-emission intensity could be achieved when the content of Eu2＋ equaled 0.01 and Nd3＋ equaled 0.05.Due to a good overlap between Eu2＋ emission and Nd3＋ excitation spectrum,the energy transfer between Eu2＋ and Nd3＋ was rather efficient,and was confirmed by spectra of Li2SrSiO4：Eu2＋,Nd3＋.An energy transfer efficiency of 55.7% was estimated from fluorescence lifetime of Eu2＋ which were 968 ns in Li2SrSiO4：0.01Eu2＋ and 429 ns in Li2SrSiO4：0.01Eu2＋,0.05Nd3＋,respectively.