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Unconventional Luminescent Centers in Metastable Phases Created by Topochemical Reduction Reactions
Author(s) -
Liu BoMei,
Zhang ZhiGang,
Zhang Kai,
Kuroiwa Yoshihiro,
Moriyoshi Chikako,
Yu HuiMei,
Li Chao,
Zheng LiRong,
Li LiNa,
Yang Guang,
Zhou Yang,
Fang YongZheng,
Hou JingShan,
Matsushita Yoshitaka,
Sun HongTao
Publication year - 2016
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201601191
Subject(s) - luminescence , metastability , phosphor , octahedron , chemistry , oxygen , redox , materials science , doping , crystallography , inorganic chemistry , optoelectronics , crystal structure , organic chemistry
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 Bi III ‐doped Y 2 O 3 (Y 2− x Bi x O 3 ) as a model system. Experimental results suggest that topochemical treatment of Y 2− x Bi x O 3 using CaH 2 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 [BiO 6 ] octahedra in Y 2− x Bi x O 3 to the oxygen‐deficient [BiO 6− 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.