Luminescent properties of YBO3 : Eu3+ nanosheets and microstructural materials consisting of nanounits

Pure hexagonal-phased YBO 3 :Eu 3+ nanocrystals (NCs) including nanosheets (NSs), bundles of nanobelts (NBs) and quasi-spheres composed of nanotubes (NTs) were prepared by hydrothermal method. The results indicate that in NCs, there exist two symmetry sites of Eu 3+ ions, the interior (A) and the surface (B), while there exists only one interior site (A) in the bulk. It is important to observe that the electronic transition rate of 5 D 0 -Σ j 7 F J of Eu 3+ at the surface site is improved 3-5 times than that of the interior site.