Sr_2SiO_4∶Eu^(2+),Nd^(3+)的近红外发光及Eu^(2+)→Nd^(3+)能量传递

Near-Infrared Fluorescence and Energy Transfer in Sr_2SiO_4:Eu^(2+),Nd^(3+)

用高温固相法制备了Sr2SiO4:Eu2+,Nd3+发光材料,研究了样品中Eu2+对Nd3+的近红外发光敏化。发现Sr2SiO4基质中Eu2+的存在可以大大增强Nd3+的特征近红外发光。通过对样品中不同位置Eu2+荧光激发和发射光谱、荧光寿命以及Nd3+荧光光谱的研究,对Eu2+向Nd3+能量传递的机理进行了分析。在Sr2SiO4中,处于激发态的Eu2+(Ⅱ)可以通过非辐射能量传递过程有效传能给Nd3+,从而直接敏化Nd3+的近红外发光。而处于激发态的Eu2+(Ⅰ)可首先传能给Eu2+(Ⅱ),再进一步通过能量传递敏化Nd3+的近红外发光。

Sr2SiO4：Eu2＋,Nd3＋ was synthesized by solid state synthesis method,and the sensitization of Nd3＋ near-infrared luminescence by Eu2＋ was investigated.The characteristic near-infrared luminescence of Nd3＋ in Sr2SiO4 matrix was greatly enhanced by co-doping of Eu2＋.The mechanism of energy transfer from Eu2＋ to Nd3＋ was analyzed through investigation of fluorescence excitation and emission spectra,and fluorescence lifetime.Excited Eu2＋（Ⅱ） transfers energy effectively to Nd3＋ through non-radiative energy transfer process in Sr2SiO4,resulting in greatly enhanced near-infrared luminescence of Nd3＋,while sensitization of Nd3＋ by Eu2＋（Ⅰ） was achieved by the way of Eu2＋（Ⅱ）.