用于物品安全的Yb^3+单掺纳米颗粒的制备与表征  

Preparation and Characterization of Yb Single-doped Nanoparticle for Item Security

作　　者：金前鹏 高思梦 徐阳[1,2] 乔辉[1,2] 钱坤 JIN Qian-peng;GAO Si-meng;XU Yang;QIAO Hui;QIAN Kun(School of Textile and Clothing,Jiangnan University,Wuxi 214122,China;Key Laboratory of Science&Technology for Eco-textiles,Ministry of Education,Wuxi 214122,China)

机构地区：[1]江南大学纺织服装学院,江苏无锡214122 [2]生态纺织教育部重点实验室,江苏无锡214122

出　　处：《稀土》2020年第4期82-90,共9页Chinese Rare Earths

基　　金：国家重点研发计划项目(2018YFC0810300)。

摘　　要：为了提高稀土荧光防伪系统的防伪力度,采用沉淀法制备了用于物品安全的Yb^3+单掺杂NaYF4纳米颗粒。利用FT-IR分析了制备过程中间产物的化学组成。利用XRD和TEM对产物的形貌结构进行表征,并结合吸收光谱和发射光谱图,分析了不同掺杂浓度NaYF4∶Yb^3+纳米颗粒发光特性。实验结果表明,Yb^3+与苯甲酸钠反应生成了多齿配合物,验证了苯甲酸钠在制备过程中起络合作用。在N2氛围中经400℃煅烧4 h得到β-NaYF4∶Yb^3+纳米颗粒,平均粒径为86 nm。该纳米颗粒在900 nm光的激发下具有930 nm^1080 nm的不可见红外发射(归属于Yb^3+的2F7/2→2F5/2),980 nm激发下具有475 nm的蓝色可见发射(归属于Yb^3+对的合作上转换发光),最大红外发射和蓝色上转换发射的样品掺杂浓度分别为5%和20%。研究结果表明NaYF4∶Yb^3+纳米颗粒在物品追踪领域具有良好的应用前景。In order to increase the anti-counterfeiting effects of the security system based on rare earth fluorescent material,NaYF4∶Yb^3+nanoparticles for item security were synthesized by precipitation.The chemical composition of intermediates in the preparation was analyzed by FTIR.The morphology and structure of the products were characterized by XRD and TEM,and luminescence properties of NaYF4∶Yb^3+nanoparticles with a series of doping concentrations were analyzed by the absorption and emission spectrums.The results of experiments show that the multidentate complexes were produced by the reaction of rare earth ions and sodium benzoate and it verified the complex effect of sodium benzoates in the preparation.The average size ofβ-NaYF4∶Yb^3+nanoparticles is 86 nm after calcination at 400℃in N2 ambience for 4 hours.The nanoparticles present an invisible infrared emission of 930 nm^1080 nm under excitation of 900 nm(corresponding to the 2F7/2→2F5/2 transition in Yb^3+)and a bright blue luminescence centered at 475 nm under the excitation of 980 nm(assigned to cooperative de-excitation of Yb^3+-Yb^3+pairs).The sample with great maximum infrared emission or blue up-conversion cooperative luminescence is doped with 5%and 20%Yb^3+,respectively.Preliminary results demonstrated the nanoparticles as promising characteristic emission labels in the detection of item tracking.

关 键 词：络合效应 镱离子 红外发射 合作上转换发光 

分 类 号：O482[理学—固体物理] O614[理学—物理]