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+)

作　　者：杨丽丽[1] 万文娇[1] 李锦清[1] 孟建新[2] 

机构地区：[1]暨南大学化学系,广东广州510632 [2]暨南大学纳米化学研究所,广东广州510632

出　　处：《光谱学与光谱分析》2011年第1期43-46,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(30670523);广东省自然科学基金团队项目(05200555)资助

摘　　要：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）.

关 键 词：高温固相法 Sr2SiO4∶Eu2+ Nd3+ 近红外发光 能量传递 

分 类 号：O614.3[理学—无机化学] O614.3[理学—化学]