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Screen Printing of Upconversion NaYF4:Yb3+/Eu3+ with Li+ doped for Anti-counterfeiting Application [Early Posting]

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摘要

Li ions affect the upconversion efficiency by changing the local crystal field of 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 concentration were synthesized by hydrothermal synthesis method respectively. Firstly, the structure and morphology of NaYF4:Yb3+/Eu3+ upconversion micro-particles (UCMPs) with different doping concentration were analysized by X-ray diffraction and scanning electron microscope (SEM). SEM results show that the UCMPs are not only highly crystallized, but also hexagons with different Li+ concentration 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 980nm laser. The results show that the fluorescence intensity of NaYF4:Yb3+/Eu3+ with 2% Li+ is the strongest, which is twice stonger the NaYF4:Yb3+/Eu3+ without Li+. Finally, the fluorescence imaging analysis of NaYF4:Yb3+/Eu3+ with 2% Li+ concentration was carried out. The upconversion micro-particles are used to screen printing to evaluate the imaging effect on different sample surfaces. The results show NaYF4: Yb3+/Eu3+ (with 2% Li+) have great application prospects in anti-counterfeiting recognition.

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作者单位:

    School of Electronic Engineering, Xi’ an University of Post & Telecommunication, Xi’an, China 710121
    Xi’ an University of Post & Telecommunications, Xi’an, China 710121
    Xi’ an University of Post & Telecommunications, Xi’an, China 710121
    Xi’ an University of Post & Telecommunications, Xi’an, China 710121
    Xi’ an University of Post & Telecommunications, Xi’an, China 710121
    Xi’ an University of Post & Telecommunications, Xi’an, China 710121
    Xi’ an University of Post & Telecommunications, Xi’an, China 710121
    Xi’ an University of Post & Telecommunications, Xi’an, China 710121
    State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an, China 710119

引用该论文

Li Dongdong, Mo Jianye, Wang Chong, Liu Wei, Ge Haibo, Han Dongdong, Hao Aihua, Chai Baoyu, She Jianbo. Screen Printing of Upconversion NaYF4:Yb3+/Eu3+ with Li+ doped for Anti-counterfeiting Application[J].Chinese Optics Letters,2020,18(11):11.