MgAl_(2)O_(4):Eu^(3+)荧光粉的制备及其光谱特性  

Preparation and spectral properties of MgAl_(2)O_(4):Eu^(3+)phosphor

作　　者：卢杨 史忠祥 王晶[1] 刘永富 时军[1] LU Yang;SHI Zhong-xiang;WANG Jing;LIU Yong-fu;SHI Jun(Liaoning Key Laboratory for Fabrication and Application of Superfine Inorganic Powders,Dalian Jiaotong University,Dalian 116028,China;Department of Chemical Engineering,Yingkou Institude of Technology,Yingkou 115014,China)

机构地区：[1]大连交通大学辽宁省无机超细粉体制备及应用重点实验室,大连116028 [2]营口理工学院材料科学与工程学院,营口115014

出　　处：《中国有色金属学报》2022年第1期100-108,共9页The Chinese Journal of Nonferrous Metals

基　　金：国家重点研发计划资助项目(2017YFB0310300);辽宁省自然基金指导计划资助项目(2019-ZD-0090)。

摘　　要：采用水热辅助固相法合成一系列Eu^(3+)掺杂MgAl_(2)O_(4):Eu^(3+)荧光粉。主要考察粉体的物相结构、形貌、颗粒尺寸及电/磁偶极跃迁强度随Eu^(3+)摩尔分数的变化规律。结果表明:当Eu^(3+)不等价取代Mg^(2+)后并未影响基质材料的晶体结构,产物全部为立方相MgAl_(2)O_(4),但间隙O^(2−)的存在会影响被取代离子Mg^(2+)的配位关。当Eu^(3+)掺入时,其会与溶液中的NH_(4)^(+)共同参与调控样品的形貌和尺寸,以致片状颗粒的厚度减小、不规则程度加剧。基于J-O理论认为,在248 nm紫外和395 nm近紫外光激发下,Eu^(3+)在MgAl_(2)O_(4)中所处格位的对称性差异是引起电偶极(^(5)D_(0)→^(7)F_(2))和磁偶极(^(5)D_(0)→^(7)F_(1))跃迁相对强度不同的主要原因。A series of Eu^(3+)doped MgAl_(2)O_(4):Eu^(3+)phosphors were synthesized by hydrothermal assisted solid phase method.The variation regularities of phase structure,morphology,particle size and electric/magnetic dipole transition intensity with Eu^(3+)contents were investigated.The results show that the crystal structure of matrix materials is not affected when Eu^(3+)replaces Mg^(2+)equivalently.All the products are cubic MgAl_(2)O_(4),however,the existence of interstitial O^(2−)ion will cause changes in the coordination relationship of the substituted ion Mg^(2+).In addition,when Eu^(3+)is incorporated,Eu^(3+)andNH_(4)^(+) will participate in the control of the morphology and size of the samples,resulting in a reduction in the thickness of the flake particles and aggravation of irregularities.Finally,based on J-O theory,it is believed that the difference of symmetry of Eu^(3+)in MgAl_(2)O_(4) is the main reason for the difference of relative intensity of electric dipole(^(5)D_(0)→^(7)F_(2))and magnetic dipole(^(5)D_(0)→^(7)F_(1))under excitation of 248 nm UV and 395 nm near UV.

关 键 词：MgAl_(2)O_(4):Eu^(3+) 格位对称性 电偶极跃迁 磁偶极跃迁 

分 类 号：O482.31[理学—固体物理]