ACaPO_4:Eu^(2+),Nd^(3+)(A=Li,K,Na)的近红外发光与能量传递  

Near-Infrared Luminescence and Energy Transfer of ACaPO_4:Eu^(2+),Nd^(3+)(A=Li,K,Na)

作　　者：肖全兰[1] 邹少瑜[1] 刘关喜[1] 彭文芳[1] 万垂铭[1] 谢丽娟[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9期2332-2336,共5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);中央高校基本科研业务费专项资金项目资助

摘　　要：采用高温固相法制备了ACaPO4∶Eu2+,Nd3+(A=Li,K,Na)系列近红外发光材料,研究了材料中Eu2+对Nd3+的近红外发光的敏化作用。发现共掺Eu2+后,材料的Nd3+的近红外发光显著提高。同时考察了ACaPO4∶Eu2+可见荧光性能、ACaPO4∶Eu2+,Nd3+近红外荧光发光性能及其荧光寿命,研究了不同Eu2+的发射波长对Nd3+近红外发光的敏化效果,分析探讨了ACaPO4体系中Eu2+-Nd3+之间的能量传递机理。在ACaPO4(A=Li,K,Na)中,随基质的不同,Eu2+的发射峰有逐步红移的现象,与Nd3+的不同激发峰重叠程度也会发生明显的变化,表明Eu2+的荧光发射波长是影响能量传递的一个重要因素,可以推测发射波长处于500～550 nm之间的Eu2+对Nd3+近红外发光具有最佳的敏化效果。Near-infrared （NIR） luminescence phosphors ACaPO4 ： Eu2＋ ,Nd3＋ （A=Li, K, Na） were prepared by conventional solid state method and the sensitization of Nd3＋ near-infrared luminescence by Eu2＋ was investigated. The characteristic NIR lu- minescence of Nd3＋ in ACaPO4 matrix is greatly enhanced by co-doping of Eu2＋. The fluorescence properties of ACaPO4 ： Eu2＋ , the NIR luminescence properties of ACaPO4 ： Eu2＋ ,Nd3＋ and the fluorescence lifetime were studied. The effect of emis-sion wavelength of Eu2＋ on NIR luminescence of Nds＋ was investigated; The energy transfer mechanism between Eu2＋ and Nds＋ was also discussed. Emission peak wavelength of Eu2＋ In ACaPO4 matrixes was found red shift with the series of A=Li, K, Na and the extent of the overlap with the different excitation peaks of Nd3＋ changes obviously. It was concluded that the emission peak position of Eu2＋ is a very important factor for energy transfer, and the optimal wavelength range for Eu2＋ →Nd3＋ energy transfer is 500 to 550 nm.

关 键 词：近红外发光 EU^2+ ND^3+ 能量传递 

分 类 号：O482.3[理学—固体物理]