@article{Chen2014, 
author = {Gen Chen and Fashen Chen and Xiaohe Liu and Wei Ma and Hongmei Luo and Junhui Li and Renzhi Ma and Guanzhou Qiu},
title = {Hollow spherical rare-earth-doped yttrium oxysulfate: A novel structure for upconversion},
year = {2014},
journal = {Nano Research},
volume = {7},
number = {8},
pages = {1093-1102},
keywords = {Upconversion, Hydrothermal, Hollow sphere, Ostwald ripening, Y2O2SO4},
url = {https://www.sciopen.com/article/10.1007/s12274-014-0472-5},
doi = {10.1007/s12274-014-0472-5},
abstract = {A facile biomolecule-assisted hydrothermal route followed by calcination has been employed for the preparation of monoclinic yttrium oxysulfate hollow spheres doped with other rare-earth ions (Yb3+ and Eu3+ or Er3+). The formation of hollow spheres may involve Ostwald ripening. The resulting hybrid materials were used for upconversion applications. The host crystal structure allows the easy co-doping of two different rare-earth metal ions without significantly changing the host lattice. The luminescent properties were affected by the ratio and concentration of dopant rare-earth metal ions due to energy transfer and the symmetry of the crystal field. The type of luminescent center and the crystallinity of samples were also shown to have a significant influence on the optical properties of the as-prepared products.}
}