Journal
PHYSICA B-CONDENSED MATTER
Volume 504, Issue -, Pages 80-85Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physb.2016.10.007
Keywords
YVO4:Eu3+; Nanophosphors; Core-Shelled nanoparticles; Luminescence; Synchrotron radiation
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Funding
- Oulu University Strategic Funding and Research Council for Natural Sciences of the Academy of Finland.
- European Community's Seventh Framework Programme (FP7) CALIPSO [312284]
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Comparative analysis of bulk, non-coated and core-shelled nanocrystalline YVO4:Eu was performed by means of time-resolved luminescence and VUV excitation luminescence spectroscopy techniques. Nanocrystalline YVO4:Eu samples - both as-prepared and YF3 core-shelled - have been synthesized by means of a microwave-assisted synthesis in ionic liquids, which allows to obtain 10-12 nm nanoparticles with high crystallinity. The results show noticeable differences between bulk and nanocrystalline YVO4:Eu in photoluminescence experimental data, which explains by influence of the nanocrystal surface. A YF3 core-shell layer around YVO4:Eu nanoparticles partially recovers the intensity of the Eu3+ emission. It is demonstrated that the Eu3+ luminescence recovery is achieved at the expense of the suppression of the intrinsic emission but not due to the passivation of surface loss centers in core-shelled nanocrystals. It is also shown that surface loss processes are the reason of the degradation of energy transfer efficiency from the host lattice to Eu3+ under high-energy excitations in vacuum ultraviolet spectral range.
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