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; Hanben Niu

doi:10.3788/COL201614.021601

Journals >Chinese Optics Letters >Volume 14 >Issue 2 >Page 021601 > Article

Chinese Optics Letters
Vol. 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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DOI: 10.3788/COL201614.021601 Cite this Article Set citation alerts

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[J]. Chinese Optics Letters, 2016, 14(2): 021601 Copy Citation Text

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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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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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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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