Europium (III) (Eu 3+)-doped nanoporous silica spheres were synthesized, and the states of Eu 3+ ions in the silica framework structure were investigated. The ordered nanopores were preserved with the doping at the Eu 3+ molar concentration to Si up to 10mol%, and the O-Si-O and Si-OH groups in the structures were clearly rearranged with the doping, indicating the interaction of Eu 3+ with the O atoms. The significant morphological changes in the spheres were observed with the doping. The photoluminescence spectral shapes due to the transitions of 5D 0- 7F 1 and 5D 0- 7F 2 were indicative of the presence of the Eu 3+ in an environment of a low symmetry. It was found that the Eu 3+ was located inside the silica framework to electrostatically interact with the environmental O atoms, which would prevent the aggregation among Eu 3+ ions to show the efficient luminescence. Therefore, the interactions between the Eu 3+ ions and silica framework structures in the spheres were successfully clarified.
- Nanoporous silica spheres
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Surfaces, Coatings and Films
- Colloid and Surface Chemistry