镧系离子掺杂Li_(0.9)K_(0.1)NbO_(3)荧光粉的多色多模荧光调控及防伪应用  

Multicolor and multimode luminescence regulation and anti-counterfeiting application of lanthanide ions doped Li_(0.9)K_(0.1)NbO_(3) phosphors

作　　者：贾朝阳 高当丽[1] 于佳 胡媛媛 柴瑞鹏 庞庆[1] 张翔宇[2] Jia Chao-Yang;Gao Dang-Li;Yu Jia;Hu Yuan-Yuan;Chai Rui-Peng;Pang Qing;Zhang Xiang-Yu(College of Science,Xi’an University of Architecture and Technology,Xi’an 710055,China;College of Science,Chang’an University,Xi’an 710064,China)

机构地区：[1]西安建筑科技大学理学院,西安710055 [2]长安大学理学院,西安710064

出　　处：《物理学报》2023年第22期200-209,共10页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11604253,51672208);陕西省重点科技创新团队项目(批准号:2022TD-34)资助的课题。

摘　　要：多色多模荧光材料在信息安全加密领域具有重要的应用价值,然而目前多色多模荧光材料的设计合成仍然是一个挑战.本文采用高温固相法制备了一系列Li_(1–x)K_(x)NbO_(3):Pr^(3+)/Er^(3+)/Tm^(3+)单掺及双掺荧光粉.通过X射线衍射仪、扫描电子显微镜、荧光光谱仪以及自搭建的加热装置,对其结构、形貌、光谱学特性以及热释光性能进行表征.研究了Li_(0.9)K_(0.1)NbO_(3)基质中Pr^(3+),Er^(3+),Tm^(3+)单掺及共掺调控的多色多模荧光特性与上/下转换、余辉和光激励荧光机理.基于优异的光谱特性,将三基色荧光粉设计成蝴蝶图案,采用不同波长光选择激发,展现了图案和色彩的动态变化,具有高阶多色多模防伪能力.Multicolor and multimode luminescence materials have important applications in the field of information security encryption.However,the design and synthesis of multicolor multimode luminescent materials is still a challenge,and only several materials have been reported.In this paper,a series of single doped and double doped Li_(1–x)K_(x)NbO_(3):Pr^(3+)/Er^(3+)/Tm^(3+)phosphors are prepared by high temperature solid state method.The structure,morphology,optical properties and thermoluminescence(TL)spectra are characterized by X-ray diffractometer(XRD),scanning electron microscope(SEM),luminescence spectrometer and self-made heating device.Firstly,the effects of different values of K^(+)content on the luminescence and trap distribution of LiNbO_(3) materials are studied.The results show that the ionic lattice is distorted when a small quantity of K^(+)ions replace Li~+.With the addition of K^(+),the photoluminescence excitation(PLE)spectra monitored emission of 620 nm shows that the ratios of the absorption peaks from matrix(200–310 nm)to absorption peaks from the intrinsic transition of Pr^(3+)ions 4f→5d(310–430 nm)change significantly,showing a double-peak characteristic.When the concentration of K^(+)ions is 0.5,the absorption peak from the matrix disappears,which may be due to the phase transition of the matrix lattice caused by excessive K^(+)ions or the introduction of a large number of defect energy levels into the matrix lattice.Moreover,K^(+)ion doping can regulate the density and distribution of traps.TL curves show that a small quantity of K^(+)doping increases the trap density of shallow traps.When a large quantity of K^(+)is doped,the phase changes of matrix lattice and the defect density decrease.Secondly,the doping of Li_(0.9)K_(0.1)NbO_(3) matrix by different luminescent centers(Pr^(3+)/Er^(3+)/Tm^(3+))is studied.The results show that the multicolor luminescence emission in red,blue and green bands and the tunable multimode luminescence(up/down conversion luminescence,afterglow luminescence

关 键 词：镧系离子掺杂 碱金属离子掺杂 上转换 多色多模发光 防伪 

分 类 号：TQ422[化学工程]