Abstract
Results are reported from a study of the optical properties of porous alumina films obtained by anodizing in a water solution of sulfuric acid and modified by thermal annealing in air at T ≥ 850°C. A comparative analysis of the data shows that the near-UV and visible photoluminescence of alumina anodized in a sulfuric acid solution is caused primarily by oxygen divacancies (F2, F $$ _2^{+} $$ , and F $$ _2^{2 + } $$ centers), while sulfate ions have little effect on the luminescence properties of anodic alumina in this spectral range.
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