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YVO 4 : Er 3+  and  YVO 4 : Er 3+ ,  Yb 3+  nanomaterials were prepared via combustion synthesis using urea as fuel and metal nitrates as precursor. The morphology and the structure of the prepared samples were characterized by x-ray diffraction, scanning electron microscopy and transmission electron microscopy. The average size of the prepared materials ranged from 20 to 30 nm in diameter. The effects of  Er 3+  and  Yb 3+  doping concentrations on structure and optical properties have been investigated. Optical properties of  YVO 4 : Er 3+  and  YVO 4 : Er 3+ ,  Yb 3+  nanoparticles were measured by photoluminescent excitation and emission spectroscopies. For the  YVO 4 : Er 3+  and  YVO 4 : Er 3+ ,  Yb 3+  samples, two strong green emissions centered at 524 and 552 nm are found, corresponding to the  2 H 11/2 — 4 I 15/2  and  4 S 11/2 — 4 I 15/2  transitions of  Er 3+  ions, respectively. Upconversion emission in the green region of the  YVO 4 : Er 3+  nanoparticles under 980 nm excitation was also investigated. Strong emission from these materials is promising for luminescent biolabeling applications.

advances in natural sciences nanoscience and nanotechnology

Combustion synthesis and characterization of Er3+-doped and Er3+, Yb3+-codoped YVO4 nanophosphors oriented for luminescent biolabeling applications