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Synthesis and Performance of BaAl 2 O 4 with a Wide Spectral Range of Optical Absorption
Author(s) -
Zhang L.W.,
Wang L.,
Zhu Y.F.
Publication year - 2007
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200700506
Subject(s) - materials science , impurity , oxygen , valence (chemistry) , absorption (acoustics) , band gap , absorption spectroscopy , valence band , analytical chemistry (journal) , spectral line , absorption edge , molar ratio , absorption band , range (aeronautics) , optics , optoelectronics , physics , catalysis , chemistry , biochemistry , chromatography , quantum mechanics , astronomy , composite material
Oxygen‐deficient BaAl 2 O 4 , with strong optical absorption in the spectra range from 200 to 2500 nm, was prepared by a simple and economic thermal treatment of BaAl 2 O 4 in a H 2 gas flow. Further studies found that a molar ratio of oxygen vacancies of about 0.4 % existed in the prepared oxygen‐deficient BaAl 2 O 4 sample. The influence of oxygen vacancies on the electronic band structures and optical absorption of BaAl 2 O 4 are elucidated via first principle calculations. Oxygen vacancies introduce impurity states above the valence band; these impurities expand and enhance the optical absorption of BaAl 2 O 4 . This approach is proposed to develop a new type of optical materials and to be applicable to many wide bandgap materials.