Details

Autor(en) / Beteiligte

• Zhao, Chengzhou
• Kong, Xianggui
• Liu, Xiaomin
• Tu, Langping
• Wu, Fei
• Zhang, Youlin
• Liu, Kai
• Zeng, Qinghui
• Zhang, Hong

Titel

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

Ist Teil von

• Nanoscale, 2013-09, Vol.5 (17), p.8084-8089

Ort / Verlag

England

Erscheinungsjahr

2013

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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:Yb(3+), Tm(3+) nanocrystals. We have demonstrated that the short wavelength UC emission bands were indeed significantly enhanced. Compared to lithium-free NaYF4:Yb(3+), Tm(3+), 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 Tm(3+) ions, when the Li(+) ions were introduced, were confirmed to be the origin of the improvement.