Screen printing of upconversion NaYF4:Yb3+/Eu3+ with Li+ doped for anti-counterfeiting application  

作　　者：Dongdong Li Jianye Mo Chong Wang Wei Liu Haibo Ge Dongdong Han Aihua Hao Baoyu Chai Jiangbo She 李冬冬;磨建业;王翀;刘薇;葛海波;韩冬冬;郝爱花;柴宝玉;佘江波(School of Electronic Engineering,Xi'an University of Post&Telecommunications,Xi'an 710121,China;State Key Laboratory of Transient Optics and Photonics,Xi'an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences,Xi'an 710119,China)

机构地区：[1]School of Electronic Engineering,Xi'an University of Post&Telecommunications,Xi'an 710121,China [2]State Key Laboratory of Transient Optics and Photonics,Xi'an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences,Xi'an 710119,China

出　　处：《Chinese Optics Letters》2020年第11期7-11,共5页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No. 61805198);the Special Research Projects of Department of Education of Shaanxi Province (No. 18JK0707)。

摘　　要：Li ions affect the upconversion efficiency by changing the local crystal field of the luminescent center. Herein, in order to improve the upconversion efficiency of NaYF4:Yb3+/Eu3+, a series of NaYF4:Yb3+/Eu3+micro-particles with different Li+doping concentrations were synthesized by the hydrothermal synthesis method, respectively.Firstly, the structure and morphology of NaYF4:Yb3+/Eu3+upconversion micro-particles(UCMPs) with different doping concentrations were analyzed by X-ray diffraction and a scanning electron microscope(SEM). SEM results show that the UCMPs are not only highly crystallized, but also have hexagons with different Li+concentrations of NaYF4:Yb3+/Eu3+. X-ray diffraction shows that the crystal field around Eu3+changes with the increase of Li+concentration. Then, the fluorescence spectrum of NaYF4:Yb3+/Eu3+was studied under the irradiation of a 980 nm laser. The results show that the fluorescence intensity of NaYF4:Yb3+/Eu3+with2% Li+is the strongest, which is twice the intensity of NaYF4:Yb3+/Eu3+without Li+. Finally, the fluorescence imaging analysis of NaYF4:Yb3+/Eu3+with 2% Li+concentration was carried out. The UCMPs are used to screen printing to evaluate the imaging effect on different sample surfaces. The results show NaYF4:Yb3+/Eu3+(with 2% Li+) has great application prospects in anti-counterfeiting recognition.

关 键 词：upconversion micro-particles hydrothermal synthesis anti-counterfeiting identification screen printing 

分 类 号：TS871.1[轻工技术与工程]