We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Unconventional Luminescent Centers in Metastable Phases Created by Topochemical Reduction Reactions.
- Authors
Liu, Bo ‐ Mei; Zhang, Zhi ‐ Gang; Zhang, Kai; Kuroiwa, Yoshihiro; Moriyoshi, Chikako; Yu, Hui ‐ Mei; Li, Chao; Zheng, Li ‐ Rong; Li, Li ‐ Na; Yang, Guang; Zhou, Yang; Fang, Yong ‐ Zheng; Hou, Jing ‐ Shan; Matsushita, Yoshitaka; Sun, Hong ‐ Tao
- Abstract
A low-temperature topochemical reduction strategy is used herein to prepare unconventional phosphors with luminescence covering the biological and/or telecommunications optical windows. This approach is demonstrated by using BiIII-doped Y2O3 (Y2− xBi xO3) as a model system. Experimental results suggest that topochemical treatment of Y2− xBi xO3 using CaH2 creates randomly distributed oxygen vacancies in the matrix, resulting in the change of the oxidation states of Bi to lower oxidation states. The change of the Bi coordination environments from the [BiO6] octahedra in Y2− xBi xO3 to the oxygen-deficient [BiO6− z] polyhedra in reduced phases leads to a shift of the emission maximum from the visible to the near-infrared region. The generality of this approach was further demonstrated with other phosphors. Our findings suggest that this strategy can be used to explore Bi-doped or other classes of luminescent systems, thus opening up new avenues to develop novel optical materials.
- Subjects
TOPOCHEMICAL reactions; OXIDATION kinetics; POLYHEDRA; OXYGEN analysis; PHOSPHOR manufacturing
- Publication
Angewandte Chemie, 2016, Vol 128, Issue 16, p5051
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201601191