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Chinese Optics Letters, Volume. 14, Issue 2, 021601(2016)

Reduced photon quenching in Ce-doped NaYF4:Yb/Ho upconversion nanoparticles with core/shell structure

Shuai Ye, Jun Song*, Dong Wang, Yuliang Tian, Junle Qu**, and Hanben Niu
Author Affiliations
  • Key Laboratory of Optoelectronic Devices and Systems of Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
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    Transmission electron microscopy morphologies of (a) NaYF4:Yb3+ 20%, Ho3+ 1%, (b) NaYF4:Yb3+ 20%, Ho3+ 0.5%, Ce3+ 20%, (c) NaYF4:Yb3+50%@NaYF4:Ho3+0.5%, (d) NaYF4:Yb3+50%@NaYF4:Ho3+0.5%@NaYF4:Ce3+20%, (e) NaYF4:Yb3+50%@NaYF4:Ho3+0.5%, Ce3+20% nanoparticles (the insets show the size distribution of the corresponding nanoparticles), and (f) SAED pattern of NaYF4:Yb3+50%@NaYF4:Ho3+1%:Ce3+20% nanoparticles.

    Fig. 1. Transmission electron microscopy morphologies of (a) NaYF4:Yb3+ 20%, Ho3+ 1%, (b) NaYF4:Yb3+ 20%, Ho3+ 0.5%, Ce3+ 20%, (c) NaYF4:Yb3+50%@NaYF4:Ho3+0.5%, (d) NaYF4:Yb3+50%@NaYF4:Ho3+0.5%@NaYF4:Ce3+20%, (e) NaYF4:Yb3+50%@NaYF4:Ho3+0.5%, Ce3+20% nanoparticles (the insets show the size distribution of the corresponding nanoparticles), and (f) SAED pattern of NaYF4:Yb3+50%@NaYF4:Ho3+1%:Ce3+20% nanoparticles.

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    Photoluminescence spectra of different types of Ce3+ ion incorporations: (a) NaYF4:Yb3+ 20%, Ho3+ 1% and (b) NaYF4:Yb3+50%@NaYF4:Ho3+0.5% nanoparticles. (c) Photoluminescence intensity of the green and red emission bands. (d) The intensity ratios from the nanoparticles in (a) and (b).

    Fig. 2. Photoluminescence spectra of different types of Ce3+ ion incorporations: (a) NaYF4:Yb3+ 20%, Ho3+ 1% and (b) NaYF4:Yb3+50%@NaYF4:Ho3+0.5% nanoparticles. (c) Photoluminescence intensity of the green and red emission bands. (d) The intensity ratios from the nanoparticles in (a) and (b).

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    Logarithmic plot of the dependence of the intensities of the green and the red UC emission bands on the pump power for the NaYF4:Yb3+50%@NaYF4:Ho3+1%, Ce3+20% UCNPs.

    Fig. 3. Logarithmic plot of the dependence of the intensities of the green and the red UC emission bands on the pump power for the NaYF4:Yb3+50%@NaYF4:Ho3+1%, Ce3+20% UCNPs.

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    (a) Energy level diagrams of Ho3+, Yb3+, and Ce3+ ions and proposed UC mechanisms. (b) Schematic illustration of the proposed energy-transfer mechanisms in NaYF4:Yb/Ho/Ce nanoparticles. (c) Schematic illustration of the proposed energy-transfer mechanisms in core/shell NaYF4:Yb@NaYF4:Ho/Ce nanoparticles.

    Fig. 4. (a) Energy level diagrams of Ho3+, Yb3+, and Ce3+ ions and proposed UC mechanisms. (b) Schematic illustration of the proposed energy-transfer mechanisms in NaYF4:Yb/Ho/Ce nanoparticles. (c) Schematic illustration of the proposed energy-transfer mechanisms in core/shell NaYF4:Yb@NaYF4:Ho/Ce nanoparticles.

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    Shuai Ye, Jun Song, Dong Wang, Yuliang Tian, Junle Qu, Hanben Niu, "Reduced photon quenching in Ce-doped NaYF4:Yb/Ho upconversion nanoparticles with core/shell structure," Chin. Opt. Lett. 14, 021601 (2016)

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    Paper Information

    Category: Materials

    Received: Oct. 12, 2015

    Accepted: Dec. 11, 2015

    Published Online: Sep. 21, 2018

    The Author Email: Jun Song (songjun@szu.edu.cn), Junle Qu (jlqu@szu.edu.cn)

    DOI:10.3788/COL201614.021601

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology