NaLa(MoO4)2∶Eu^3＋/Tb^3＋/Tm^3＋材料的合成、发光及能量传递  

The Synthesis,Luminescence and Energy Transmission of NaLa(MoO_4)_2∶Eu^(3+)/Tb^(3+)/Tm^(3+) Materials

作　　者：徐晶[1] 闫景辉[1] 韩钰婷 乔树亮[2] 杨波[1] 李莉[3] 刘彩虹[3] 姚爽[1] 邹明强[3] 

机构地区：[1]长春理工大学化学与环境工程学院,吉林长春130022 [2]包头出入境检验检疫局,内蒙古包头014010 [3]中国检验检疫科学研究院,北京100123

出　　处：《光谱学与光谱分析》2015年第10期2712-2717,共6页Spectroscopy and Spectral Analysis

基　　金：国家重大科学仪器设备开发专项(2012YQ090197);国家“十二五”科技支撑计划项目(2012BAK26B04);吉林省科技发展计划重点项目(201220223);国家质检总局科研项目(2012IK013)资助

摘　　要：采用微乳液-水热法合成一系列NaLa(MoO4)2∶Eu3+/Tb3+/Tm3+单/共掺的荧光粉(NLM)。采用X射线衍射(XRD)、扫描电子显微镜(SEM)、荧光光谱对荧光粉的晶体结构、形貌特征和发光性质进行了测试和研究。结果表明:所制备的样品均为四方晶系单晶,Eu3+,Tb3+,Tm3+均以取代的方式进入La3+的格位;样品的形貌为四方片状结构,颗粒尺寸1~1.5μm;当Eu3+掺杂浓度为是9%时,NLM∶9%Eu3+荧光粉在616nm发射峰是最强的,此时在NLM基质中Eu3+之间的临界传递距离(Rc)约为15.20。在NLM∶9%Eu3+的发射光谱中,591nm处的发射峰为Eu3+的5 D0→7 F1的磁偶极跃迁;616nm处的发射峰为Eu3+的5 D0→7 F2的电偶极跃迁,电偶极跃迁发射强度约是磁偶极跃迁强度的10倍,表明Eu3+位于无反演对称中心格位。采用固定Eu3+(Tb3+)的浓度,改变Tb3+(Eu3+)浓度的方法,研究了Eu3+与Tb3+之间的能量传递机理。通过调节Eu3+,Tb3+和Tm3+的掺杂浓度,实现在单一基质条件下可见光区域的光色调节,在360nm激发下NLM∶x%Eu3+,y%Tb3+,z%Tm3+荧光粉的发光由蓝光(0.205,0.135)调到伪白光(0.305,0.266)。A series of Eu^3＋ /Tb^3＋ /Tm^3＋ single/co‐doped NaLa（MoO4 ）2 （NLM ） phosphors have been synthesized by microemul‐sion‐hydrothermal method .Phosphor crystal structure ,morphology and luminescent properties were tested and studied by X‐ray diffraction （XRD） ,scanning electron microscopy （SEM ） and fluorescence spectroscopy .The results show that the prepared samples are all tetragonal single crystals .By way of substitution ,the sites of La3＋ are replaced by Eu^3＋ ,Tb^3＋ and Tm^3＋ .Mor‐phology of the samples are tetragonal sheet structure and the size of particles is 1~1.5 μm .When the doping concentration of Eu3＋ is 9% ,NLM ∶9% Eu^3＋ phosphor emission peak is the strongest at 616 nm ,the critical transfer distance （Rc ） between Eu^3＋ in the NLM matrix is about 15.20 A^° at this time .At the emission spectrum of NLM∶9% Eu^3＋ ,the peak at 591 nm is the magnetic dipole transition of ^5 D0 to 7F1 of Eu^3＋ .The peak at 616 nm is the electric dipole transition of 5 D0 to 7 F2 of Eu^3＋ . Electric dipole transition emission intensity is about 10 times of the strength of the magnetic dipole transition .This indicates that Eu3＋ is located at noninversion symmetry site .By Fixing Eu^3＋ （Tb^3＋ ） concentration and varying the concentration of Tb^3＋（Eu^3＋ ） ,the energy transfer mechanism between Eu^3＋ and Tb^3＋ was studied .By adjusting the Eu^3＋ ,Tb^3＋ and Tm^3＋ doping concentrations ,tunable luminescence of visible light region is implemented under the single matrix .The luminescence of NLM∶x% Eu^3＋ ,y% Tb^3＋ ,z% Tm^3＋ phosphors are translated from blue （0.205 ,0.135） to pseudo‐white （0.305 ,0.266） under 360 nm irradiation .

关 键 词：白光二极管 荧光粉 微乳液-水热法 

分 类 号：O611.4[理学—无机化学]