Synthesis and luminescence properties of Eu(III)-doped nanoporous silica spheres

Motohiro Tagaya, Toshiyuki Ikoma, Tomohiko Yoshioka, Satoshi Motozuka, Zhefeng Xu, Fujio Minami, Junzo Tanaka

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)456-464
Number of pages9
JournalJournal of Colloid And Interface Science
Issue number2
Publication statusPublished - Nov 15 2011
Externally publishedYes


  • Bio-imaging
  • Europium
  • Nanoparticles
  • Nanoporous silica spheres
  • Photoluminescence

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry


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