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Issue 17, 2013
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Li+ ion doping: an approach for improving the crystallinity and upconversion emissions of NaYF4:Yb3+, Tm3+ nanoparticles

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Abstract

The application of upconversion nanoparticles (UCNPs), especially in vivo, has so far been hampered by their relatively low upconversion efficiency. In this work, a strategy of Li+ doping was revisited with the aim of enhancing UV to blue UC luminescence of NaYF4:Yb3+, Tm3+ nanocrystals. We have demonstrated that the short wavelength UC emission bands were indeed significantly enhanced. Compared to lithium-free NaYF4:Yb3+, Tm3+, the UC emission intensities of 452 nm and 479 nm of the NPs co-doped with 7 mol% Li+ ions were increased by 8 and 5 times, respectively. The mechanism of the enhancement was discussed and the improvement of the nanoparticles' crystallinity and the distortion of the local symmetry around the Tm3+ ions, when the Li+ ions were introduced, were confirmed to be the origin of the improvement.

Graphical abstract: Li+ ion doping: an approach for improving the crystallinity and upconversion emissions of NaYF4:Yb3+, Tm3+ nanoparticles

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Publication details

The article was received on 17 Apr 2013, accepted on 31 May 2013 and first published on 04 Jun 2013


Article type: Paper
DOI: 10.1039/C3NR01916K
Nanoscale, 2013,5, 8084-8089

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    Li+ ion doping: an approach for improving the crystallinity and upconversion emissions of NaYF4:Yb3+, Tm3+ nanoparticles

    C. Zhao, X. Kong, X. Liu, L. Tu, F. Wu, Y. Zhang, K. Liu, Q. Zeng and H. Zhang, Nanoscale, 2013, 5, 8084
    DOI: 10.1039/C3NR01916K

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