Issue 10, 2013

Multicolour and up-conversion fluorescence of lanthanide doped Vernier phase yttrium oxyfluoride nanocrystals

Abstract

Multicolour and up-conversion fluorescent nanocrystals of lanthanide doped orthorhombic yttrium oxyfluorides were prepared via a facile precursor route for the first time. The stepwise fabrication procedure involves room-temperature coprecipitation of Y3+ ions with CO32− and F in water and subsequent thermal decomposition. Powder X-ray diffraction studies confirmed that all of the undoped and lanthanide ion-doped samples annealed at 400 °C were pure Vernier phase adopting an orthorhombic structure. The crystal structure, synthetic details, morphologies, and luminescence properties of the nanocrystals were investigated by means of TEM, thermal and spectroscopic measurements. In the structure, Y atoms occupy four crystalline sites with different coordination by O2−/F, giving rise to complex environments for the doping of rare earth ions. Green emission bands were observed from the Tb3+ doped samples under UV excitation (λex = 284, 377 nm), while the Eu3+ doped nanocrystals exhibited bright red emission upon both UV and blue irradiation (λex = 381, 465 nm). Those nanocrystals codoped with Yb3+/Er3+, Yb3+/Ho3+ and Yb3+/Tm3+ show intense red, green and blue up-conversion fluorescence respectively upon irradiation at 980 nm with a diode laser. The Vernier phase yttrium oxyfluoride phosphors have the potential for use in applications such as bioprobes, optical nanodevices, and chromatic displays.

Graphical abstract: Multicolour and up-conversion fluorescence of lanthanide doped Vernier phase yttrium oxyfluoride nanocrystals

Supplementary files

Article information

Article type
Paper
Submitted
16 Nov 2012
Accepted
14 Jan 2013
First published
16 Jan 2013

J. Mater. Chem. C, 2013,1, 1995-2001

Multicolour and up-conversion fluorescence of lanthanide doped Vernier phase yttrium oxyfluoride nanocrystals

T. Wen, W. Luo, Y. Wang, M. Zhang, Y. Guo, J. Yuan, J. Ju, Y. Wang, F. Liao and B. Yang, J. Mater. Chem. C, 2013, 1, 1995 DOI: 10.1039/C3TC00642E

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