|
|||||
|
|
Unconventional Luminescent Centers in Metastable Phases Created by Topochemical Reduction Reactions |
|
| Authors: | Bo‐Mei Liu Zhi‐Gang Zhang Kai Zhang Prof?Dr Yoshihiro Kuroiwa Prof?Dr Chikako Moriyoshi Prof?Dr Hui‐Mei Yu Chao Li Dr Li‐Rong Zheng Prof?Dr Li‐Na Li Prof?Dr Guang Yang Yang Zhou Prof?Dr Yong‐Zheng Fang Dr Jing‐Shan Hou Dr Yoshitaka Matsushita Prof?Dr Hong‐Tao Sun |
| Institution: | 1. College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, P.R. China;2. Department of Physical Science, Hiroshima University, Hiroshima, Japan;3. School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai, P.R. China;4. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, P.R. China;5. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education and International Center for Dielectric Research, Xi'an Jiaotong University, Xi'an, P.R. China;6. Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, P.R. China;7. Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, P.R. China;8. National Institute for Material Sciences (NIMS), Ibaraki, Japan |
| 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?xBixO3) as a model system. Experimental results suggest that topochemical treatment of Y2?xBixO3 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?xBixO3 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. |
| Keywords: | bismuth luminescence phosphors reduction topochemistry |