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.
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Chen, G., Chen, F., Liu, X. et al. Hollow spherical rare-earth-doped yttrium oxysulfate: A novel structure for upconversion. Nano Res. 7, 1093–1102 (2014). https://doi.org/10.1007/s12274-014-0472-5
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DOI: https://doi.org/10.1007/s12274-014-0472-5